Acadia Realty Trust (AKR) 10-K 19 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Feb. 13, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	ACADIA REALTY TRUST
Entity Central Index Key	899,629
Current Fiscal Year End Date	--12-31
Trading Symbol	AKR
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding			81,703,355
Entity Public Float		$ 2,230.7
Entity Shell Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Operating real estate, net	$ 3,160,851	$ 2,952,918
Real estate under development	120,297	173,702
Net investments in real estate	3,281,148	3,126,620
Notes receivable, net	109,613	153,829
Investments in and advances to unconsolidated affiliates	262,410	302,070
Other assets, net	208,570	214,959
Cash and cash equivalents	21,268	74,823
Rents receivable, net	62,191	51,738
Restricted cash	13,580	10,846
Assets of properties held for sale	0	25,362
Total assets	3,958,780	3,960,247
LIABILITIES
Mortgage and other notes payable, net	1,017,288	909,174
Unsecured notes payable, net	533,257	473,735
Unsecured line of credit	0	41,500
Accounts payable and other liabilities	214,961	210,052
Capital lease obligation	71,111	70,611
Dividends and distributions payable	24,593	24,244
Distributions in excess of income from, and investments in, unconsolidated affiliates	15,623	15,292
Total liabilities	1,876,833	1,744,608
Commitments and contingencies
Acadia Shareholders' Equity
Common shares, $0.001 par value, authorized 200,000,000 shares, issued and outstanding 81,557,472 and 83,708,140 shares, respectively	82	84
Additional paid-in capital	1,548,603	1,596,514
Accumulated other comprehensive income	516	2,614
Distributions in excess of accumulated earnings	(89,696)	(32,013)
Total Acadia shareholders’ equity	1,459,505	1,567,199
Noncontrolling interests	622,442	648,440
Total equity	2,081,947	2,215,639
Total liabilities and equity	$ 3,958,780	$ 3,960,247

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common shares, par value (in dollars per share)	$ 0.001	$ 0.001
Common shares, authorized (in shares)	200,000,000	200,000,000
Common shares, issued (in shares)	81,557,472	83,708,140
Common shares, outstanding (in shares)	81,557,472	83,708,140

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 262,213	$ 250,262	$ 189,939
Operating expenses
Depreciation and amortization	117,549	104,934	70,011
General and administrative	34,343	33,756	40,648
Real estate taxes	36,712	35,946	25,630
Property operating	45,211	41,668	24,244
Impairment charge	0	14,455	0
Other operating	857	2,184	7,517
Total operating expenses	234,672	232,943	168,050
Operating income	27,541	17,319	21,889
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	9,302	23,371	39,449
Interest income	13,231	29,143	25,829
Interest expense	(69,978)	(58,978)	(34,645)
Gain on change in control	0	5,571	0
(Loss) income from continuing operations before income taxes	(19,904)	16,426	52,522
Income tax (provision) benefit	(934)	(1,004)	105
(Loss) income from continuing operations before gain on disposition of properties	(20,838)	15,422	52,627
Gain on disposition of properties, net of tax	5,140	48,886	81,965
Net (loss) income	(15,698)	64,308	134,592
Net loss (income) attributable to noncontrolling interests	47,137	(2,838)	(61,816)
Net income attributable to Acadia	$ 31,439	$ 61,470	$ 72,776
Basic and diluted earnings per share (in dollars per share)	$ 0.38	$ 0.73	$ 0.94
Rental income
Revenues	$ 208,756	$ 198,941	$ 152,814
Expense reimbursements
Revenues	48,284	44,907	32,282
Other
Revenues	$ 5,173	$ 6,414	$ 4,843

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Gains (losses) on disposition of properties	$ 0	$ 15,336	$ 35,950

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (15,698)	$ 64,308	$ 134,592
Other comprehensive (loss) income:
Unrealized (loss) income on valuation of swap agreements	(2,659)	634	(646)
Reclassification of realized interest on swap agreements	71	3,317	4,576
Other comprehensive (loss) income	(2,588)	3,951	3,930
Comprehensive (loss) income	(18,286)	68,259	138,522
Comprehensive loss (income) attributable to noncontrolling interests	47,627	(3,377)	(62,081)
Comprehensive income attributable to Acadia	$ 29,341	$ 64,882	$ 76,441

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Accumulated Earnings	Total Common Shareholders’ Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 1,521,354	$ 70	$ 1,092,239	$ (4,463)	$ 12,642	$ 1,100,488	$ 420,866
Balance (in Shares) at Dec. 31, 2015		70,258,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	0	$ 1	7,891			7,892	(7,892)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		351,000
Issuance of Common Shares, net of issuance costs	450,130	$ 13	450,117			450,130
Issuance of Common Shares, net of issuance costs (in Shares)		12,961,000
Issuance of OP Units to acquire real estate	31,429						31,429
Dividends/distribution declared ($1.09, $1.05 and 1.16 per Common Share/OP Unit for Year Ended Dec 31, 2018, 2017 and 2016)	(97,806)				(91,053)	(91,053)	(6,753)
Employee and trustee stock compensation, net	13,694		926			926	12,768
Employee and trustee stock compensation, net (in Shares)		28,000
Windfall tax benefit	555		555			555
Change in control of previously unconsolidated investment	(75,713)						(75,713)
Acquisition of noncontrolling interest	(18,379)		7,546			7,546	(25,925)
Noncontrolling interest distributions	(80,769)						(80,769)
Noncontrolling interest contributions	295,108						295,108
Comprehensive (loss) income	138,522			3,665	72,776	76,441	62,081
Reallocation of noncontrolling interests	0		35,652			35,652	(35,652)
Ending Balance at Dec. 31, 2016	2,178,125	$ 84	1,594,926	(798)	(5,635)	1,588,577	589,548
Balance (in Shares) at Dec. 31, 2016		83,598,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	$ 0		1,541			1,541	(1,541)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		87,000
Repurchase of Common Shares (in shares)	0
Dividends/distribution declared ($1.09, $1.05 and 1.16 per Common Share/OP Unit for Year Ended Dec 31, 2018, 2017 and 2016)	$ (94,301)				(87,848)	(87,848)	(6,453)
Employee and trustee stock compensation, net	11,155		698			698	10,457
Employee and trustee stock compensation, net (in Shares)		23,000
Noncontrolling interest distributions	(32,805)						(32,805)
Noncontrolling interest contributions	85,206						85,206
Comprehensive (loss) income	68,259			3,412	61,470	64,882	3,377
Reallocation of noncontrolling interests	0		(651)			(651)	651
Ending Balance at Dec. 31, 2017	$ 2,215,639	$ 84	1,596,514	2,614	(32,013)	1,567,199	648,440
Balance (in Shares) at Dec. 31, 2017	83,708,140	83,708,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership	$ 0		2,068			2,068	(2,068)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares)		117,000
Repurchase of Common Shares	$ (55,111)	$ (2)	(55,109)			(55,111)
Repurchase of Common Shares (in shares)	(2,294,235)	(2,294,000)
Dividends/distribution declared ($1.09, $1.05 and 1.16 per Common Share/OP Unit for Year Ended Dec 31, 2018, 2017 and 2016)	$ (96,010)				(89,122)	(89,122)	(6,888)
Employee and trustee stock compensation, net	12,948		574			574	12,374
Employee and trustee stock compensation, net (in Shares)		26,000
Noncontrolling interest distributions	(24,793)						(24,793)
Noncontrolling interest contributions	47,560						47,560
Comprehensive (loss) income	(18,286)			(2,098)	31,439	29,341	(47,627)
Reallocation of noncontrolling interests	0		4,556			4,556	(4,556)
Ending Balance at Dec. 31, 2018	$ 2,081,947	$ 82	$ 1,548,603	$ 516	$ (89,696)	$ 1,459,505	$ 622,442
Balance (in Shares) at Dec. 31, 2018	81,557,472	81,557,000

CONSOLIDATED STATEMENTS OF SH_2

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (15,698)	$ 64,308	$ 134,592
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Gain on disposition of properties	(5,140)	(48,886)	(81,965)
Gain on change in control	0	(5,571)	0
Depreciation and amortization	117,549	104,934	70,011
Distributions of operating income from unconsolidated affiliates	15,556	15,556	7,256
Equity in earnings and gains of unconsolidated affiliates	(9,302)	(23,371)	(39,449)
Stock compensation expense	12,948	11,155	13,695
Amortization of financing costs	6,008	5,985	3,204
Impairment charge	0	14,455	0
Other, net	(11,768)	(10,621)	(8,095)
Changes in assets and liabilities:
Other liabilities	6,161	(4,285)	26,532
Prepaid expenses and other assets	(7,168)	(6,498)	(11,677)
Rents receivable, net	(10,044)	(11,274)	(4,847)
Accounts payable and accrued expenses	(3,026)	8,768	591
Net cash provided by operating activities	96,076	114,655	109,848
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of real estate	(147,985)	(200,429)	(495,644)
Development, construction and property improvement costs	(94,834)	(108,142)	(149,434)
Issuance of or advances on notes receivable	(3,002)	(10,600)	(157,352)
Proceeds from the disposition of properties, net	63,866	260,711	150,378
Investments in and advances to unconsolidated affiliates	(3,161)	(6,535)	(72,098)
Return of capital from unconsolidated affiliates and other	26,338	43,684	79,030
Proceeds from notes receivable	26,000	32,000	42,819
Return of deposits for properties under contract	1,692	(2,000)	1,424
Payment of deferred leasing costs	(6,106)	(5,202)	(7,515)
Change in control of previously unconsolidated (consolidated) affiliate	573	576	(5,172)
Net cash (used in) provided by investing activities	(136,619)	4,063	(613,564)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on mortgage and other notes	(81,726)	(306,119)	(394,864)
Principal payments on unsecured debt	(632,300)	(277,134)	(541,790)
Proceeds received on mortgage and other notes	187,173	156,344	222,071
Proceeds from unsecured debt	648,800	359,625	666,716
(Repurchase) issuance of Common Shares	(55,111)		450,130
Capital contributions from noncontrolling interests	47,560	85,206	295,108
Distributions to noncontrolling interests	(31,568)	(39,942)	(105,994)
Dividends paid to Common Shareholders	(88,887)	(99,527)	(91,334)
Deferred financing and other costs	(4,219)	(6,211)	(11,678)
Net cash (used in) provided by financing activities	(10,278)	(127,758)	488,365
Decrease in cash and restricted cash	(50,821)	(9,040)	(15,351)
Cash of $74,823, $71,805 and $72,776 and restricted cash of $10,846, $22,904 and $37,284, respectively, beginning of year	85,669	94,709	110,060
Cash of $21,268, $74,823 and $71,805 and restricted cash of $13,580, $10,846 and $22,904, respectively, end of year	34,848	85,669	94,709
Supplemental disclosure of cash flow information
Cash paid during the period for interest, net of capitalized interest of $5,625 and $13,509 and $21,109 respectively	61,832	49,942	42,279
Cash paid for income taxes, net of refunds	1,227	875	2,036
Supplemental disclosure of non-cash investing activities
Assumption of accounts payable and accrued expenses through acquisition of real estate	2,597	2,173	3,587
Acquisition of real estate through conversion of note receivable		9,142
Acquisition of undivided interest in a property through conversion of notes receivable	22,201	60,695
Acquisition of real estate through assumption of debt			120,672
Acquisition of real estate through conversion of OP Units			29,336
Acquisition of capital lease obligation			76,461
Mortgage debt financed at time of acquisition			63,900
Assumption of prepaid expenses and other assets through acquisition of real estate			2,226
Change in control of previously unconsolidated (consolidated) investment
(Increase) decrease in real estate, net	(31,836)	(39,322)	90,559
Gain on change in control	0	5,571
Decrease in notes receivable		32,010
Decrease (increase) in investments in and advances to unconsolidated affiliates	35,881	4,159	(21,421)
Decrease in noncontrolling interest			(75,713)
Change in other assets and liabilities	(3,472)	(1,842)	1,403
Increase (decrease) in cash and restricted cash upon change of control	$ 573	$ 576	$ (5,172)

Consolidated Statements of Ca_2

Consolidated Statements of Cashflows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 21,268	$ 74,823	$ 71,805
Restricted cash	13,580	10,846	22,904
Cash paid for capitalized interest	$ 5,625	$ 13,509	$ 21,109

Organization, Basis of Presenta

Organization, Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization, Basis of Presentation and Summary of Significant Accounting Policies	Organization Acadia Realty Trust and subsidiaries (collectively, the “Company”) is a fully-integrated equity real estate investment trust (“REIT”) focused on the ownership, acquisition, development, and management of retail properties located primarily in high-barrier-to-entry, supply-constrained, densely-populated metropolitan areas in the United States. All of the Company’s assets are held by, and all of its operations are conducted through, Acadia Realty Limited Partnership (the “Operating Partnership”) and entities in which the Operating Partnership owns an interest. As of December 31, 2018 and December 31, 2017, the Company controlled approximately 94% of the Operating Partnership as the sole general partner and is entitled to share, in proportion to its percentage interest, in the cash distributions and profits and losses of the Operating Partnership. The limited partners primarily represent entities or individuals that contributed their interests in certain properties or entities to the Operating Partnership in exchange for common or preferred units of limited partnership interest (“Common OP Units” or “Preferred OP Units”) and employees who have been awarded restricted Common OP Units (“LTIP Units”) as long-term incentive compensation ( Note 13 As of December 31, 2018, the Company has ownership interests in 118 properties within its core portfolio, which consist of those properties either 100% owned, or partially owned through joint venture interests, by the Operating Partnership, or subsidiaries thereof, not including those properties owned through its funds (“Core Portfolio”). The Company also has ownership interests in 53 properties within its opportunity funds, Acadia Strategic Opportunity Fund II, LLC (“Fund II”), Acadia Strategic Opportunity Fund III LLC (“Fund III”), Acadia Strategic Opportunity Fund IV LLC (“Fund IV”), and Acadia Strategic Opportunity Fund V LLC (“Fund V”). Acadia Strategic Opportunity Fund I, LP (“Fund I,” together with Funds II, III, IV, and V, the “Funds”) was liquidated in 2015. The 171 Core Portfolio and Fund properties primarily consist of street and urban retail, and suburban shopping centers. In addition, the Company, together with the investors in the Funds, invest or invested in operating companies through Acadia Mervyn Investors I, LLC (“Mervyns I,” which was liquidated in 2018), Acadia Mervyn Investors II, LLC (“Mervyns II”) and Fund II, all on a non-recourse basis. The Company consolidates the Funds as it has (i) the power to direct the activities that most significantly impact the Funds’ economic performance, (ii) is obligated to absorb the Funds’ losses and (iii) has the right to receive benefits from the Funds that could potentially be significant. The Operating Partnership is the sole general partner or managing member of the Funds and Mervyns I and II and earns fees or priority distributions for asset management, property management, construction, development, leasing, and legal services. Cash flows from the Funds and Mervyns I and II are distributed pro-rata to their respective partners and members (including the Operating Partnership) until each receives a certain cumulative return (“Preferred Return”) and the return of all capital contributions. Thereafter, remaining cash flow is distributed 20% to the Operating Partnership (“Promote”) and 80% to the partners or members (including the Operating Partnership). All transactions between the Funds and the Operating Partnership have been eliminated in consolidation. The following table summarizes the general terms and Operating Partnership’s equity interests in the Funds and Mervyns II (dollars in millions): Entity Formation Date Operating Partnership Share of Capital Capital Called as of December 31, 2018 Unfunded Commitment Equity Interest Held By Operating Partnership (a) Preferred Return Total Distributions as of December 31, 2018 (b) Fund II and Mervyns II (c) 6/2004 28.33 % $ 347.1 $ — 28.33 % 8 % $ 146.6 Fund III 5/2007 24.54 % 423.9 26.1 24.54 % 6 % 551.9 Fund IV 5/2012 23.12 % 420.8 109.2 23.12 % 6 % 147.4 Fund V 8/2016 20.10 % 85.1 434.9 20.10 % 6 % — (a) Amount represents the current economic ownership at December 31, 2018, which could differ from the stated legal ownership based upon the cumulative preferred returns of the respective fund. (b) Represents the total for the Funds, including the Operating Partnership and noncontrolling interests’ shares. (c) During April 2018, a distribution of $15.0 million was made to the Fund II investors, including $4.3 million to the Operating Partnership. This amount remains subject to re-contribution to Fund II until April 2021. Basis of Presentation Segments At December 31, 2018, the Company had three reportable operating segments: Core Portfolio, Funds and Structured Financing. The Company’s chief operating decision maker may review operational and financial data on a property basis and does not differentiate properties on a geographical basis for purposes of allocating resources or capital. Principles of Consolidation The consolidated financial statements include the consolidated accounts of the Company and its investments in partnerships and limited liability companies in which the Company has control in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810 “Consolidation” (“ASC Topic 810”). The ownership interests of other investors in these entities are recorded as noncontrolling interests. All significant intercompany balances and transactions have been eliminated in consolidation. Investments in entities for which the Company has the ability to exercise significant influence over, but does not have financial or operating control, are accounted for using the equity method of accounting. Accordingly, the Company’s share of the earnings (or losses) of these entities are included in consolidated net income. Use of Estimates GAAP requires the Company’s management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The most significant assumptions and estimates relate to the valuation of real estate, depreciable lives, revenue recognition and the collectability of notes receivable and rents receivable. Application of these estimates and assumptions requires the exercise of judgment as to future uncertainties and, as a result, actual results could differ from these estimates. Reclassifications Certain prior year amounts have been reclassified for consistency with the current year presentation in the statement of cash flows. These reclassifications had no effect on the reported results of operations. Summary of Significant Accounting Policies Real Estate Land, buildings, and personal property are carried at cost less accumulated depreciation. Improvements and significant renovations that extend the useful life of the properties are capitalized, while replacements, maintenance, and repairs that do not improve or extend the lives of the respective assets are expensed as incurred. Real estate under development includes costs for significant property expansion and development. Depreciation is computed on the straight-line basis over estimated useful lives of the assets as follows: Buildings and improvements Useful lives of Furniture and fixtures Useful lives, ranging from Tenant improvements Shorter of economic life or lease terms Purchase Accounting – Upon acquisitions of real estate, the Company assesses the fair value of acquired assets and assumed liabilities (including land, buildings and improvements, and identified intangibles such as above- and below-market leases and acquired in-place leases and customer relationships) and acquired liabilities in accordance with and “ and allocates the acquisition price based on these assessments. When acquisitions of properties do not meet the criteria for business combinations, no goodwill is recorded and acquisition costs are capitalized The Company assesses fair value of its tangible assets acquired and assumed liabilities based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information at the measurement period. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. In determining the value of above- and below-market leases, the Company estimates the present value difference between contractual rent obligations and estimated market rate of leases at the time of the transaction. To the extent there were fixed-rate options at below-market rental rates, the Company included these along with the current term below-market rent in arriving at the fair value of the acquired leases. The discounted difference between contract and market rents is being amortized to rental income over the remaining applicable lease term, inclusive of any option periods. In determining the value of acquired in-place leases and customer relationships, the Company considers market conditions at the time of the transaction and values the costs to execute similar leases during the expected lease-up period from vacancy to existing occupancy, including carrying costs. The value assigned to in-place leases and tenant relationships is amortized over the estimated remaining term of the leases. If a lease were to be terminated prior to its scheduled expiration, all unamortized costs relating to that lease would be written off. The Company estimates the value of any assumption of mortgage debt based on market conditions at the time of acquisitions including prevailing interest rates, terms and ability to obtain financing for a similar asset. Mortgage debt discounts or premiums are amortized into interest expense over the remaining term of the related debt instrument. Real Estate Under Development – The Company capitalizes certain costs related to the development of real estate. Interest and real estate taxes incurred during the period of the construction, expansion or development of real estate are capitalized and depreciated over the estimated useful life of the building. The Company will cease the capitalization of these costs when construction activities are substantially completed and the property is available for occupancy by tenants, but no later than one year from the completion of major construction activity at which time the project is placed in service and depreciation commences. If the Company suspends substantially all activities related to development of a qualifying asset, the Company will cease capitalization of interest and taxes until activities are resumed. Real Estate Impairment – The Company reviews its real estate and real estate under development for impairment when there is an event or a change in circumstances that indicates that the carrying amount may not be recoverable. In cases where the Company does not expect to recover its carrying costs on properties held for use, the Company reduces its carrying costs to fair value. The determination of anticipated undiscounted cash flows is inherently subjective, requiring significant estimates made by management, and considers the most likely expected course of action at the balance sheet date based on current plans, intended holding periods and available market information. If the Company is evaluating the potential sale of an asset, the undiscounted future cash flows analysis is probability-weighted based upon management’s best estimate of the likelihood of the alternative courses of action as of the balance sheet date. Such cash flow projections consider factors such as expected future operating income, trends and prospects, as well as the effects of demand, competition and other factors. If an impairment is indicated, an impairment loss is recognized based on the excess of the carrying amount of the asset over its fair value. See Note 8 for information about impairment charges incurred during the periods presented. Dispositions of Real Estate – The Company recognizes property sales in accordance with “ Sales of real estate include the sale of land, operating properties and investments in real estate joint ventures. Beginning January 1, 2018, gains on sale of investment properties are recognized, and the related real estate derecognized, when the Company has satisfied its performance obligations by transferring control of the property. Typically, the timing of payment and satisfaction of performance obligations occur simultaneously on the disposition date upon transfer of the property’s ownership. Prior to January 1, 2018, gains from dispositions were recognized under the full accrual or partial sales method provided that various criteria relating to terms of sales and subsequent involvement by the Company with the asset sold are met. Real Estate Held for Sale – The Company generally considers assets to be held for sale when it has entered into a contract to sell the property, all material due diligence requirements have been satisfied, and management believes it is probable that the disposition will occur within one year. Assets that are classified as held for sale are recorded at the lower of their carrying amount or fair value, less cost to sell. Notes Receivable Notes receivable include certain loans that are held for investment and are collateralized by real estate-related investments and may be subordinate to other senior loans. Notes receivable are recorded at stated principal amounts or at initial investment less accretive yield for loans purchased at a discount, which is accreted over the life of the note. The Company defers loan origination and commitment fees, net of origination costs, and amortizes them over the term of the related loan. The Company evaluates the collectability of both principal and interest based upon an assessment of the underlying collateral value to determine whether it is impaired. A reserve is recorded when, based upon current information and events, it is probable that the Company will be unable to collect all amounts due according to the existing contractual terms. The amount of the reserve is calculated by comparing the recorded investment to the value of the underlying collateral. As the underlying collateral for a majority of the notes receivable is real estate-related investments, the same valuation techniques are used to value the collateral as those used to determine the fair value of real estate investments for impairment purposes. Given the small number of notes outstanding, the Company does not provide for an additional reserve based on the grouping of loans, as the Company believes the characteristics of its notes are not sufficiently similar to allow an evaluation of these notes as a group for a possible loan loss allowance. As such, all of the Company’s notes are evaluated individually for this purpose. Interest income on performing notes is accrued as earned. A note is placed on non-accrual status when, based upon current information and events, it is probable that the Company will not be able to collect all amounts due according to the existing contractual terms. Recognition of interest income on an accrual basis on non-performing notes is resumed when it is probable that the Company will be able to collect amounts due according to the contractual terms. Investments in and Advances to Unconsolidated Joint Ventures Some of the Company’s joint ventures obtain non-recourse third-party financing on their property investments, contractually limiting the Company’s exposure to losses. The Company recognizes income for distributions in excess of its investment where there is no recourse to the Company and no intention or obligation to contribute additional capital. For investments in which there is recourse to the Company or an obligation or intention to contribute additional capital exists, distributions in excess of the investment are recorded as a liability. When characterizing distributions from equity investees within the Company's consolidated statements of cash flows, all distributions received are first applied as returns on investment to the extent there are cumulative earnings related to the respective investment and are classified as cash inflows from operating activities. If cumulative distributions are in excess of cumulative earnings, distributions are considered return of investment. In such cases, the distribution is classified as cash inflows from investing activities. To the extent that the Company’s carrying basis in an unconsolidated affiliate is different from the basis reflected at the joint venture level, the basis difference is amortized over the life of the related assets and included in the Company’s share of equity in net income (loss) of investments in unconsolidated affiliates the joint venture. The Company periodically reviews its investments in unconsolidated joint ventures for other-than-temporary losses in investment value. Any decline that is not expected to be recovered based on the underlying assets of the investment, is considered other than temporary and an impairment charge is recorded as a reduction in the carrying value of the investment. During the periods presented there were no impairment charges related to the Company’s investments in unconsolidated joint ventures. Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed the limits insured by the Federal Deposit Insurance Corporation. Restricted Cash Restricted cash consists principally of cash held for real estate taxes, construction costs, property maintenance, insurance, minimum occupancy and property operating income requirements at specific properties as required by certain loan agreements. Deferred Costs Fees and costs paid in the successful negotiation of leases are deferred and amortized on a straight-line basis over the terms of the respective leases. Fees and costs incurred in connection with obtaining financing are deferred and amortized as a component of interest expense over the term of the related debt obligation on a straight-line basis, which approximates the effective interest method. The Company capitalizes salaries, commissions and benefits related to time spent by leasing and legal department personnel involved in originating leases. Effective January 1, 2019, these internal leasing costs will no longer be capitalized as discussed further below under ASU 2016-02. Derivative Instruments and Hedging Activities The Company measures derivative instruments at fair value and records them as assets or liabilities, depending on its rights or obligations under the applicable derivative contract. Derivatives that are not designated as hedges must be adjusted to fair value through earnings. For a derivative designated and that qualified as a cash flow hedge, the effective portion of the change in fair value of the derivative is recognized in Other comprehensive (loss) income until the hedged item is recognized in earnings. The ineffective portion of a derivative’s change in fair value is immediately recognized in earnings. Although the Company's derivative contracts are subject to master netting arrangements, which serve as credit mitigants to both the Company and its counterparties under certain situations, the Company does not net its derivative fair values or any existing rights or obligations to cash collateral on the consolidated balance sheets. The Company does not use derivatives for trading or speculative purposes. For the periods presented, all of the Company's derivatives qualified and were designated as cash flow hedges, and none of its derivatives were deemed ineffective. Noncontrolling Interests Noncontrolling interests represent the portion of equity that the Company does not own in those entities it consolidates. The Company identifies its noncontrolling interests separately within the equity section on the Company’s consolidated balance sheets. The amounts of consolidated net earnings attributable to the Company and to the noncontrolling interests are presented separately on the Company’s consolidated statements of income. Noncontrolling interests also include amounts related to common and preferred OP Units issued to unrelated third parties in connection with certain property acquisitions. In addition, the Company periodically issues common OP Units to certain employees of the Company under its share-based incentive program. Unit holders generally have the right to redeem their units for shares of the Company's common stock subject to blackout and other limitations. Common and restricted OP Units are included in the caption Noncontrolling interest within the equity section on the Company’s consolidated balance sheets. Revenue Recognition and Accounts Receivable Minimum rents from tenants are recognized using the straight-line method over the non-cancelable lease term of the respective leases. Lease termination fees are recognized upon the effective termination of a tenant’s lease when the Company has no further obligations under the lease. As of December 31, 2018 and 2017, unbilled rents receivable relating to the straight-lining of rents of $47.2 million and $37.4 million, respectively, are included in Rents Receivable, net on the accompanying consolidated balance sheets. Certain of these leases also provide for percentage rents based upon the level of sales achieved by the tenant. Percentage rent is recognized in the period when the tenants’ sales breakpoint is met. In addition, leases typically provide for the reimbursement to the Company of real estate taxes, insurance and other property operating expenses. These reimbursements are recognized as revenue in the period the related expenses are incurred. The Company makes estimates of the uncollectability of its accounts receivable related to tenant revenues. An allowance for doubtful accounts has been provided against certain tenant accounts receivable that are estimated to be uncollectible. Once the amount is ultimately deemed to be uncollectible, it is written off. Rents receivable at December 31, 2018 and 2017 are shown net of an allowance for doubtful accounts of $7.9 million and $5.9 million, respectively. Stock-Based Compensation Stock-based compensation expense for all equity-classified stock-based compensation awards is based on the grant date fair value estimated in accordance with current accounting guidance for share-based payments. The Company recognizes these compensation costs for only those shares or units expected to vest on a straight-line or graded-vesting basis, as appropriate, over the requisite service period of the award. The Company includes stock-based compensation within the Additional paid-in capital caption of equity. Income Taxes The Company has made an election to be taxed, and believes it qualifies, as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). To maintain REIT status for Federal income tax purposes, the Company is generally required to distribute at least 90% of its REIT taxable income to its shareholders as well as comply with certain other income, asset and organizational requirements as defined in the Code. Accordingly, the Company is generally not subject to Federal corporate income tax to the extent that it distributes 100% of its REIT taxable income each year. In connection with the REIT Modernization Act, the Company is permitted to participate in certain activities and still maintain its qualification as a REIT, so long as these activities are conducted in entities that elect to be treated as taxable subsidiaries under the Code. As such, the Company is subject to Federal and state income taxes on the income from these activities. The Tax Cuts and Jobs Act was enacted in December 2017 and is generally effective for tax years beginning in 2018. This new legislation is not expected to have a material adverse effect on the Company’s business and allows non-corporate shareholders to deduct a portion of the Company’s dividends. Although it may qualify for REIT status for Federal income tax purposes, the Company is subject to state income or franchise taxes in certain states in which some of its properties are located. In addition, taxable income from non-REIT activities managed through the Company’s taxable REIT subsidiaries (“TRS”) is fully subject to Federal, state and local income taxes. The Company accounts for TRS income taxes under the liability method as required by ASC Topic 740, “Income Taxes.” Under the liability method, deferred income taxes are recognized for the temporary differences between the GAAP basis and tax basis of the TRS income, assets and liabilities. The Company records net deferred tax assets to the extent it believes it is more likely than not that these assets will be realized and would record a valuation allowance to reduce deferred tax assets when it has determined that an uncertainty exists regarding their realization, which would increase the provision for income taxes. In making such determination, the Company considers all available positive and negative evidence, including forecasts of future taxable income, the reversal of other existing temporary differences, available net operating loss carry-forwards, tax planning strategies and recent results of operations. Several of these considerations require assumptions and significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates that the Company is utilizing to manage its business. To the extent facts and circumstances change in the future, adjustments to the valuation allowances may be required. Recently Adopted Accounting Pronouncements Recently adopted accounting pronouncements include those adopted during the year ended December 31, 2018. In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows—Classification of Certain Cash Receipts and Cash Payments. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash In January 2017, the FASB issued ASU No. 2017-01, Business Combinations—Clarifying the Definition of a Business. In January 2017, the FASB issued ASU No. 2017-03, Accounting Changes and Error Corrections (Topic 250) and Investments— Equity Method and Joint Ventures (Topic 323). In February 2017, the FASB issued ASU No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting, In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities In March 2018, the FASB issued ASU No. 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118, Recently Issued Accounting Pronouncements Lease Accounting In February 2016, the FASB issued ASU No. 2016-02 , Leases. Revenue from Contracts with Customers, initial direct current GAAP (Topic 840, Leases ). This will result in a change to the accounting for our ASU 2016-02 initially provided for one retrospective transition method; however, a second transition method was later added with ASU 2018-11 as described below. To ease the transition, the new lease accounting guidance permits companies to utilize certain practical expedients in their implementation of the new standard: • A package of three practical expedients that must be elected together for all leases and includes: (i) not reassessing expired or existing contracts as to whether they are or contain leases; (ii) not reassessing lease classification of existing leases and (iii) not reassessing the amount of capitalized initial direct costs for existing leases; • ASU 2016-02 also includes a practical expedient to use hindsight in determining the lease term or assessing purchase options for existing leases and in assessing impairment of right of use assets; • ASU 2018-01, Land Easements Practical Expedient for Transition to Topic 842 • A new practical expedient under ASU 2018-11, described below. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases Leases (Topic 842) In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements Leases In December 2018, the FASB issued ASU 2018-20 Leases (Topic 842), Narrow-Scope Improvements for Lessors The Company has adopted ASU No. 2016-02 (as amended by subsequent ASUs) effective January 1, 2019 utilizing the new transition method described in ASU 2018-11 and has availed itself of all the available practical expedients described above except it will not use hindsight in determining the lease term or assessing purchase options for existing leases and in assessing impairment of right of use assets. As lessor, the Company expects that post-adoption substantially all existing leases will have no change in the timing of revenue recognition until their expiration or termination. For common area maintenance income, currently reported within expense reimbursements, while this will be considered a nonlease component within the scope of Topic 606 for new leases, the Company has elected the lessor practical expedient to not separate maintenance from the associated lease for all existing and new leases and to account for the combined component as a single lease component. The Company has determined that the effect of electing this lessor practical expedient is that revenues related to leases will be reported on one line in the presentation within the statement of income. The timing of revenue recognition is expected to be the same for the majority of the Company’s new leases as compared to similar existing leases. After adoption, the Company will no longer capitalize a significant portion of internal leasing costs that were previously capitalized (the Company capitalized $1.4 million and $1.3 million of internal leasing costs during the years ended December 31, 2018 and 2017, respectively ). As a lessee, the Company is party to several equipment, ground, and office leases with future payment obligations aggregating approximately $203.1 million at December 31, 2018 Other Accounting Topics In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. Revenue from Contracts with Customers In July 2018, the FASB issued ASU No. 2018-09, Codification Improvements In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-15 Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In November 2018, the FASB issued ASU No. 2018-19 Codification Improvements to Topic 326, Financial Instruments – Credit Losses Financial Instruments – Credit Losses – Measure at Amortized Cost Leases

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2018
Acquisition And Disposition Of Properties And Discontinued Operations [Abstract]
Real Estate	The Company’s consolidated real estate is comprised of the following (in thousands): December 31, 2018 2017 Land $ 710,469 $ 658,835 Buildings and improvements 2,594,828 2,406,488 Tenant improvements 151,154 131,850 Construction in progress 44,092 18,642 Properties under capital lease 76,965 76,965 Total 3,577,508 3,292,780 Less: Accumulated depreciation (416,657 ) (339,862 ) Operating real estate, net 3,160,851 2,952,918 Real estate under development, at cost 120,297 173,702 Net investments in real estate $ 3,281,148 $ 3,126,620 Acquisitions and Conversions During the years ended December 31, 2018 and December 31, 2017, the Company acquired the following consolidated retail properties (dollars in thousands): Property and Location Percent Acquired Date of Acquisition Purchase Price 2018 Acquisitions and Conversions Core Bedford Green Land Parcel - Bedford Hills, NY 100% Mar 23, 2018 $ 1,337 Subtotal Core 1,337 Fund IV Broughton Street Partners I - Savannah, GA (Conversion) ( Note 4 100% Oct 11, 2018 36,104 Subtotal Fund IV 36,104 Fund V Trussville Promenade - Trussville, AL 100% Feb 21, 2018 45,259 Elk Grove Commons - Elk Grove, CA 100% Jul 18, 2018 59,320 Hiram Pavilion - Hiram, GA 100% Oct 23, 2018 44,443 Subtotal Fund V 149,022 Total 2018 Acquisitions and Conversions $ 186,463 2017 Acquisitions and Conversions Core Market Square Shopping Center - Wilmington, DE (Conversion) ( Note 4 100% Nov 16, 2017 $ 42,800 Subtotal Core 42,800 Fund IV Lincoln Place - Fairview Heights, IL 100% Mar 13, 2017 35,350 Shaw's Plaza - Windham, ME (Conversion) ( Note 3 ) 100% Jun 30, 2017 9,142 Subtotal Fund IV 44,492 Fund V Plaza Santa Fe - Santa Fe, NM 100% Jun 5, 2017 35,220 Hickory Ridge - Hickory, NC 100% Jul 27, 2017 44,020 New Towne Plaza - Canton, MI 100% Aug 4, 2017 26,000 Fairlane Green - Allen Park, MI 100% Dec 20, 2017 62,000 Subtotal Fund V 167,240 Total 2017 Acquisitions and Conversions $ 254,532 The 2018 acquisitions were considered asset acquisitions based on accounting guidance effective as of January 1, 2018 (). The 2017 acquisitions and conversions were deemed to be business combinations. For the year ended December 31, 2018, the Company capitalized $0.3 million of acquisition costs related to the Funds. The Company expensed $2.1 million of acquisition costs for the year ended December 31, 2017, of which $1.2 million related to the Core Portfolio and $0.9 million related to the Funds. No debt was assumed in any of the 2018 Acquisitions or 2017 Acquisitions or Conversions. Revenues and net income from the Company’s consolidated 2018 acquisitions and conversions totaled $9.0 million and $0.5 million, respectively for the year ended December 31, 2018. Revenues and net loss from the Company’s consolidated 2017 acquisitions and conversions totaled $10.2 million and $3.5 million, respectively for the year ended December 31, 2017. Purchase Price Allocations The purchase prices for the 2018 acquisitions and the 2017 acquisitions and conversions were allocated to the acquired assets and assumed liabilities based on their estimated fair values at the dates of acquisition. The following table summarizes the allocation of the purchase price of properties acquired during the years ended December 31, 2018 and December 31, 2017 (in thousands): Year Ended December 31, 2018 2017 Net Assets Acquired Land $ 38,086 $ 48,138 Buildings and improvements 129,586 173,576 Other assets — 84 Acquisition-related intangible assets ( Note 6 ) 26,693 44,269 Acquisition-related intangible liabilities ( Note 6 ) (7,902 ) (11,535 ) Net assets acquired $ 186,463 $ 254,532 Consideration Cash $ 147,985 $ 200,429 Conversion of note receivable — 41,010 Liabilities assumed 2,597 3,363 Existing interest in previously unconsolidated investment 35,881 4,159 Change in control of previously unconsolidated investment — 5,571 Total Consideration $ 186,463 $ 254,532 Dispositions During the years ended December 31, 2018 and December 31, 2017, the Company disposed of the following consolidated properties (in thousands): Property and Location Owner Date Sold Sale Price Gain (Loss) on Sale 2018 Disposition Sherman Avenue - New York, NY Fund II Apr 17, 2018 $ 26,000 $ 33 Lake Montclair - Dumfries, VA Fund IV Aug 27, 2018 22,450 2,923 1861 Union Street - San Francisco, CA Fund IV Aug 29, 2018 6,000 2,184 210 Bowery - 4 Residential Condos - New York, NY Fund IV Nov 30, 2018, Dec 10, 2018, Dec 17, 2018, Dec 21, 2018 12,050 — Total 2018 Dispositions $ 66,500 $ 5,140 2017 Dispositions New Hyde Park Shopping Center - New Hyde Park, NY Fund III Jul 6, 2017 $ 22,075 $ 6,433 216th Street - New York, NY Fund II Sep 11, 2017 30,579 6,543 City Point Condominium Tower I - Brooklyn, NY Fund II Oct 13, 2017 96,000 (810 ) 1151 Third Avenue - New York, NY Fund IV Nov 16, 2017 27,000 5,183 260 E 161st Street - Bronx, NY Fund II Dec 13, 2017 105,684 31,537 Total 2017 Dispositions $ 281,338 $ 48,886 The aggregate revenue, expenses and pre-tax income reported within continuing operations for the aforementioned consolidated properties that were sold during the years ended December 31, 2018, December 31, 2017 and December 31, 2016 were as follows (in thousands): Year Ended December 31, 2018 2017 2016 Revenues $ 1,968 $ 16,249 $ 20,097 Expenses (1,874 ) (20,529 ) (17,079 ) Loss (income) from continuing operations of disposed properties before gain on disposition of properties 94 (4,280 ) 3,018 Gain on disposition of properties 5,140 48,886 81,965 Net income attributable to noncontrolling interests (3,368 ) (32,254 ) (70,714 ) Net income attributable to Acadia $ 1,866 $ 12,352 $ 14,269 Properties Held for Sale At December 31, 2018, the Company had no properties classified as held-for-sale. Real Estate Under Development and Construction in Progress Real estate under development represents the Company’s consolidated properties that have not yet been placed into service while undergoing substantial development or construction. Development activity for the Company’s consolidated properties comprised the following during the periods presented (dollars in thousands): December 31, 2017 Year Ended 2018 December 31, 2018 Number of Properties Carrying Value Transfers In Capitalized Costs Transfers Out Number of Properties Carrying Value Core 2 $ 21,897 $ — $ 6,320 $ 20,458 1 $ 7,759 Fund II — 4,908 — 2,554 — — 7,462 Fund III 2 63,939 — 36,117 78,814 1 21,242 Fund IV 1 82,958 — 876 — 1 83,834 Total 5 $ 173,702 $ — $ 45,867 $ 99,272 3 $ 120,297 During the year ended December 31, 2018, the Company placed one Core development project into service and one Fund III development project into service. In addition to the consolidated projects noted above, the Company had one unconsolidated project in development at December 31, 2017, which it placed into service during the year ended December 31, 2018. During the year ended December 31, 2017, the Company placed substantially all of Fund II’s City Point project into service as well as three Fund IV properties, reclassified Fund II’s Sherman Avenue property as held for sale and placed one Core property into development. In addition to the consolidated projects noted above, the Company had one unconsolidated project remaining in development after placing three of its four unconsolidated Fund IV development properties into service during the year ended December 31, 2017. Construction in progress pertains to construction activity at the Company’s operating properties which are in service and continue to operate during the construction period.

Notes Receivable, Net

Notes Receivable, Net	12 Months Ended
	Dec. 31, 2018
Accounts And Notes Receivable Net [Abstract]
Notes Receivable, Net	The Company’s notes receivable, net were collateralized either by the underlying properties or the borrower’s ownership interest in the entities that own the properties, and were as follows (dollars in thousands): December 31, December 31, December 31, 2018 Description 2018 2017 Number Maturity Date Interest Rate Core Portfolio $ 56,475 $ 101,695 2 Apr 2019 - Apr 2020 6.0% - 8.1% Fund II 32,582 31,778 1 May 2020 2.5% Fund III 5,306 5,106 1 Jul 2020 18.0% Fund IV 15,250 15,250 1 Feb 2021 15.3% $ 109,613 $ 153,829 5 During the year ended December 31, 2018, the Company: • exchanged $22.0 million of a Core note receivable plus accrued interest thereon of $0.3 million for an additional undivided interest in the Town Center property ( Note 4 • received full payment on $26.0 million of Core notes receivable plus accrued interest of $0.2 million; • funded an additional $2.8 million to its existing $15.0 million Core note receivable and entered into an agreement to extend the maturity to April 1, 2020; • advanced an additional $0.2 million on a Fund III note receivable; and • increased the balance of a Fund II note receivable by the interest accrued of $0.8 million. During the year ended December 31, 2017, the Company: • recovered the full value of a $12.0 million Core note receivable, which was previously in default, plus accrued interest and fees aggregating $16.8 million; • exchanged $92.7 million of Core notes receivable plus accrued interest thereon of $1.8 million for additional undivided interests in the Market Square and Town Center properties ( Note 4 • funded an additional $10.0 million on an existing Core note receivable, which had a total commitment of $20.0 million, and was subsequently repaid in full during the fourth quarter; • entered into an agreement to extend the maturity of a $15.0 million Core note receivable to June 1, 2018; • increased the balance of a Fund II note receivable by the interest accrued of $0.8 million; • advanced an additional $0.6 million on a Fund III note receivable; and • exchanged a $9.0 million Fund IV note receivable plus accrued interest of $0.1 million thereon for an investment in a shopping center in Windham, Maine ( Note 2 The Company monitors the credit quality of its notes receivable on an ongoing basis and considers indicators of credit quality such as loan payment activity, the estimated fair value of the underlying collateral, the seniority of the Company’s loan in relation to other debt secured by the collateral and the prospects of the borrower. Earnings from these notes and mortgages receivable are reported within the Company’s Structured Financing segment ( Note 12

Investments in and Advances to

Investments in and Advances to Unconsolidated Affiliates	12 Months Ended
	Dec. 31, 2018
Equity Method Investments And Joint Ventures [Abstract]
Investments in and Advances to Unconsolidated Affiliates	The Company accounts for its investments in and advances to unconsolidated affiliates primarily under the equity method of accounting as it has the ability to exercise significant influence, but does not have financial or operating control over the investment, which is maintained by each of the unaffiliated partners who co-invest with the Company. The Company’s investments in and advances to unconsolidated affiliates consist of the following (dollars in thousands): Nominal Ownership Interest December 31, December 31, Portfolio Property December 31, 2018 2018 2017 Core: 840 N. Michigan (a) 88.43% $ 65,013 $ 69,846 Renaissance Portfolio 20% 32,458 35,041 Gotham Plaza 49% 29,550 29,416 Town Center (a, b) 75.22% 99,758 78,801 Georgetown Portfolio 50% 4,653 3,479 231,432 216,583 Mervyns I & II: KLA/Mervyn's, LLC (c) 10.5% — — Fund III: Fund III Other Portfolio 90% 21 167 Self Storage Management (d) 95% 206 206 227 373 Fund IV: Broughton Street Portfolio (e) 50% 3,236 48,335 Fund IV Other Portfolio 90% 14,540 20,199 650 Bald Hill Road 90% 12,880 13,609 30,656 82,143 Various Funds: Due (to) from Related Parties (f) (461 ) 2,415 Other (g) 556 556 Investments in and advances to unconsolidated affiliates $ 262,410 $ 302,070 Core: Crossroads (h) 49% $ 15,623 $ 15,292 Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,623 $ 15,292 (a) Represents a tenancy-in-common interest. (b) During November 2017 and March 2018, as discussed below, the Company increased its ownership in Town Center. (c) Distributions, discussed below, have exceeded the Company’s non-recourse investment, therefore the carrying value is zero. (d) Represents a variable interest entity for which the Company was determined not to be the primary beneficiary. (e) The Company is entitled to a 15% return on its cumulative capital contribution which was $3.0 million and $15.4 million at December 31, 2018 and December 31, 2017, respectively. In addition, the Company is entitled to a 9% preferred return on a portion of its equity, which was $2.8 million and $41.2 million at December 31, 2018 and December 31, 2017, respectively. (f) Represents deferred fees. (g) Includes a cost-method investment in Albertson’s ( Note 8 (h) Distributions have exceeded the Company’s investment; however, the Company recognizes a liability balance as it may be required to return distributions to fund future obligations of the entity. Core Portfolio Acquisition of Unconsolidated Investment On January 4, 2017, an entity in which the Company owns a 20% noncontrolling interest (the “Renaissance Portfolio”), acquired a 6,200 square foot property in Alexandria, Virginia referred to as (“907 King Street”) for $3.0 million. The Renaissance Portfolio is now a 213,000 square-foot portfolio of 18 mixed-use properties, 16 of which are located in Georgetown, Washington D.C. and two of which are located in Alexandria, Virginia. Brandywine Portfolio, Market Square and Town Center The Company owns an interest in an approximately one million square foot retail portfolio (the “Brandywine Portfolio” joint venture) located in Wilmington, Delaware, which includes two properties referred to as “Market Square” and “Town Center.” Prior to the second quarter of 2016, the Company had a controlling interest in the Brandywine Portfolio, and it was therefore consolidated within the Company’s financial statements. During April 2016, the arrangement with the partners of the Brandywine Portfolio was modified to change the legal ownership from a partnership to a tenancy-in-common interest, as well as to provide certain participating rights to the outside partners. As a result of these modifications, the Company de-consolidated the Brandywine Portfolio and accounted for its interest under the equity method of accounting effective May 1, 2016. Furthermore, as the owners of the Brandywine Portfolio had consistent ownership interests before and after the modification and the underlying net assets were unchanged, the Company reflected the change from consolidation to equity method based upon its historical cost. The Brandywine Portfolio and Market Square ventures do not include the property held by Brandywine Holdings, an entity consolidated by the Company. Additionally, in April 2016, the Company repaid the outstanding balance of $140.0 million of non-recourse debt collateralized by the Brandywine Portfolio and provided a note receivable collateralized by the partners’ tenancy-in-common interest in the Brandywine Portfolio for their proportionate share of the repayment. On May 1, 2017, the Company exchanged $16.0 million of the $153.4 million notes receivable (the “Brandywine Notes Receivable”) ( Note 3 Note 2 On November 16, 2017, the Company exchanged $60.7 million of the Brandywine Notes Receivable plus accrued interest of $0.9 million for one of the partner’s 38.89% tenancy-in-common interests in Town Center. The incremental investment in Town Center was recorded at $61.6 million and the excess of this amount over the venture’s book value associated with this interest, or $34.5 million, is being amortized over the remaining depreciable lives of the venture’s assets. The Company previously had a 22.22% interest in Town Center which then became 61.11% following the November 2017 transaction. On March 28, 2018, the Company exchanged $22.0 million of its Brandywine Notes Receivable plus accrued interest of $0.3 million for one of the partner’s 14.11% tenancy-in-common interests in Town Center. The incremental investment in Town Center was recorded at $ 22.3 million and the excess of this amount over the venture’s book value associated with this interest, or $12.7 million, is being amortized over the remaining depreciable lives of the venture’s assets. The Company continues to apply the equity method of accounting for its aggregate 75.22% noncontrolling interest in Town Center after the March 2018 transaction. At December 31, 2018, $38.7 million of the Brandywine Note Receivable remains outstanding ( Note 3 Fund Investments Mervyn’s I & II In 2017, Mervyn’s I and Mervyn’s II received a total of $1.1 million in distributions from certain investments. The Company had already reduced the carrying amount of these investments to zero, and consequently the entire amount received has been reflected as equity in earnings and gains of unconsolidated affiliates in the consolidated statements of income. Albertson’s “Other” includes, among other investments, Fund II’s cost method investment reflecting an effective 1.05% interest in Albertson’s Companies, Inc. (“Albertson’s”), a privately-held national supermarket chain. In 2017, the Company received $2.4 million in distributions from Albertson’s and reduced the carrying amount of its investment in Albertson’s to zero ( Note 8 Storage Post On May 15, 2018, Fund III’s Storage Post venture, which is a cost-method investment with no carrying value, distributed $3.2 million of which the Operating Partnership’s share was $0.8 million. Broughton Street Portfolio During 2014, Fund IV acquired 50% interests in two joint ventures referred to as “BSP I” and “BSP II” with the same venture partner to acquire and operate a total of 23 properties in Savannah, Georgia referred to as the “Broughton Street Portfolio.” Since that time, as described below, the ventures have sold eight of the properties and terminated the master leases on two of the properties. In October 2018, the venture partner relinquished its interest in BSP I resulting in Fund IV becoming the 100% owner of the BSP I venture, which holds 11 consolidated properties at December 31, 2018 (). Fund IV accounted for this transaction as an asset purchase at fair value whereby its existing preferred and common interests were deemed consideration for the properties and no gain or loss was recognized. At December 31, 2018, the Broughton Street portfolio had 13 remaining properties, two of which are unconsolidated and are held within the BSP II venture. 2018 Dispositions of Unconsolidated Investments On January 18, 2018, Fund IV’s Broughton Street Portfolio venture sold two properties for aggregate proceeds of $8.0 million, resulting in a net loss of $0.4 million at the property level of which the Fund’s share and the Operating Partnership’s proportionate share of the loss was zero, due to Fund IV’s preferred return. On June 29, 2018, Fund IV’s Broughton Street Portfolio venture terminated its master leases on two of its properties resulting in a net loss of $1.0 million at the property level for which the Operating Partnership’s share was less than $0.1 million. On August 29, 2018, Fund IV’s Broughton Street Portfolio venture sold a property for proceeds of $2.0 million, resulting in a net loss of $0.3 million at the property level, of which the Operating Partnership’s share was less than $0.1 million. 2017 Dispositions of Unconsolidated Investments On January 31, 2017, Fund IV completed the disposition of 2819 Kennedy Boulevard, for $19.0 million less $8.4 million debt repayment for net proceeds of $10.6 million, resulting in a gain on disposition of $6.3 million at the property level, of which the Fund’s share was $6.2 million, which is included in equity in earnings and gains from unconsolidated affiliates in the consolidated statements of income. The Operating Partnership’s proportionate share of the gain was $1.4 million, net of noncontrolling interests. On February 15, 2017, Fund III completed the disposition of Arundel Plaza, for $28.8 million less $10.0 million debt repayments for net proceeds of $18.8 million, resulting in a gain on disposition of $8.2 million at the property level, of which the Fund’s share was $5.3 million, which is included in equity in earnings and gains from unconsolidated affiliates in the consolidated statements of income. The Operating Partnership’s proportionate share of the gain was $1.3 million, net of noncontrolling interests. On June 30, 2017, Fund IV completed the disposition of 1701 Belmont Avenue, for $5.6 million less $2.9 million debt repayments for net proceeds of $2.7 million, resulting in a gain on disposition of $3.3 million at the property level, of which the Fund’s share was $3.3 million, which is included in equity in earnings and gains from unconsolidated affiliates in the consolidated statements of income. The Operating Partnership’s proportionate share of the gain was $0.8 million, net of noncontrolling interests. On October 3 and December 21, 2017, Fund IV’s Broughton Street Portfolio venture sold a total of five properties for aggregate proceeds of $11.0 million resulting in a net gain of $1.2 million at the property level, of which the Fund’s share was $0.6 million, which is included in equity in earnings and gains from unconsolidated affiliates in the consolidated financial statements. The Operating Partnership’s proportionate share of the gain was $0.1 million, net of noncontrolling interests. Fees from Unconsolidated Affiliates The Company earned property management, construction, development, legal and leasing fees from its investments in unconsolidated partnerships totaling $1.1 million and $1.3 million and $1.2 million for the years ended December 31, 2018, 2017 and 2016, respectively, which is included in other revenues in the consolidated financial statements. In addition, the Company paid to certain unaffiliated partners of its joint ventures, $2.2 million and $2.0 million and $2.4 million for the years ended December 31, 2018, 2017 and 2016, respectively, for leasing commissions, development, management, construction and overhead fees. Summarized Financial Information of Unconsolidated Affiliates The following combined and condensed Balance Sheets and Statements of Income, in each period, summarize the financial information of the Company’s investments in unconsolidated affiliates (in thousands): December 31, 2018 2017 Combined and Condensed Balance Sheets Assets: Rental property, net $ 488,000 $ 518,900 Real estate under development — 26,681 Investment in unconsolidated affiliates 6,853 6,853 Other assets 91,497 100,901 Total assets $ 586,350 $ 653,335 Liabilities and partners’ equity: Mortgage notes payable $ 408,967 $ 405,652 Other liabilities 54,675 61,932 Partners’ equity 122,708 185,751 Total liabilities and partners’ equity $ 586,350 $ 653,335 Company's share of accumulated equity $ 141,384 $ 185,533 Basis differential 104,084 95,358 Deferred fees, net of portion related to the Company's interest 1,780 3,472 Amounts (payable) receivable by the Company (461 ) 2,415 Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates 246,787 286,778 Company's share of distributions in excess of income from and investments in unconsolidated affiliates 15,623 15,292 Investments in and advances to unconsolidated affiliates $ 262,410 $ 302,070 Year Ended December 31, 2018 2017 2016 Combined and Condensed Statements of Income Total revenues $ 80,184 $ 83,222 $ 84,218 Operating and other expenses (23,586 ) (24,711 ) (25,724 ) Interest expense (19,954 ) (18,733 ) (16,300 ) Depreciation and amortization (22,228 ) (24,192 ) (35,432 ) Loss on debt extinguishment — (154 ) — (Loss) gain on disposition of properties (1,673 ) 18,957 (1,340 ) Net income attributable to unconsolidated affiliates $ 12,743 $ 34,389 $ 5,422 Company’s share of equity in net income of unconsolidated affiliates $ 12,345 $ 26,039 $ 40,538 Basis differential amortization (3,043 ) (2,668 ) (1,089 ) Company’s equity in earnings of unconsolidated affiliates $ 9,302 $ 23,371 $ 39,449

Other Assets, Net and Accounts

Other Assets, Net and Accounts Payable and Other Liabilities	12 Months Ended
	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other Assets, Net and Accounts Payable and Other Liabilities	Other assets, net and accounts payable and other liabilities are comprised of the following for the periods presented: December 31, (in thousands) 2018 2017 Other Assets, Net: Lease intangibles, net ( Note 6 ) $ 115,939 $ 127,571 Deferred charges, net (a) 28,619 24,589 Prepaid expenses 18,422 16,838 Other receivables 5,058 11,356 Accrued interest receivable 17,046 11,668 Deposits 4,611 6,296 Due from seller 4,000 4,300 Deferred tax assets 2,032 2,096 Derivative financial instruments ( Note 8 ) 7,018 4,402 Due from related parties 1,802 1,479 Corporate assets 1,953 2,369 Income taxes receivable 2,070 1,995 $ 208,570 $ 214,959 (a) Deferred Charges, Net: Deferred leasing and other costs $ 45,011 $ 41,020 Deferred financing costs related to line of credit 8,960 7,786 53,971 48,806 Accumulated amortization (25,352 ) (24,217 ) Deferred charges, net $ 28,619 $ 24,589 Accounts Payable and Other Liabilities: Lease intangibles, net ( Note 6 ) $ 95,045 $ 104,478 Accounts payable and accrued expenses 65,215 61,420 Deferred income 34,052 31,306 Tenant security deposits, escrow and other 10,588 10,029 Derivative financial instruments ( Note 8 ) 7,304 1,467 Income taxes payable 19 176 Other 2,738 1,176 $ 214,961 $ 210,052

Lease Intangibles

Lease Intangibles	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Lease Intangibles	Upon acquisitions of real estate, the Company assesses the fair value of acquired assets (including land, buildings and improvements, and identified intangibles such as above- and below-market leases, including below-market options and acquired in-place leases) and assumed liabilities. The lease intangibles are amortized over the remaining terms of the respective leases, including option periods where applicable. Intangible assets and liabilities are included in other assets and other liabilities ( Note 5 December 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizable Intangible Assets In-place lease intangible assets $ 216,021 $ (105,972 ) $ 110,049 $ 193,821 $ (72,749 ) $ 121,072 Above-market rent 18,169 (12,279 ) 5,890 16,786 (10,287 ) 6,499 $ 234,190 $ (118,251 ) $ 115,939 $ 210,607 $ (83,036 ) $ 127,571 Amortizable Intangible Liabilities Below-market rent $ (152,188 ) $ 57,721 $ (94,467 ) $ (147,232 ) $ 43,391 $ (103,841 ) Above-market ground lease (671 ) 93 (578 ) (671 ) 34 (637 ) $ (152,859 ) $ 57,814 $ (95,045 ) $ (147,903 ) $ 43,425 $ (104,478 ) During the year ended December 31, 2018, the Company acquired in-place lease intangible assets of $24.2 million, above-market rents of $2.5 million, and below-market rents of $7.9 million with weighted-average useful lives of 5.2, 5.1, and 20.5 years, respectively. During the year ended December 31, 2017, the Company acquired in-place lease intangible assets of $41.6 million, above-market rents of $2.7 million, below-market rents of $10.9 million, and an above-market ground lease of $0.7 million with weighted-average useful lives of 4.1, 4.8, 12.1, and 11.5 years, respectively. Amortization of in-place lease intangible assets is recorded in depreciation and amortization expense and amortization of above-market rent and below-market rent is recorded as a reduction to and increase to rental income, respectively, in the consolidated statements of income. Amortization of above-market ground leases are recorded as a reduction to rent expense in the consolidated statements of income. The scheduled amortization of acquired lease intangible assets and assumed liabilities as of December 31, 2018 is as follows (in thousands): Years Ending December 31, Net Increase in Lease Revenues Increase to Amortization Reduction of Rent Expense Net Income (Expense) 2019 $ 8,431 $ (27,309 ) $ 58 $ (18,820 ) 2020 8,206 (20,511 ) 58 (12,247 ) 2021 7,725 (15,196 ) 58 (7,413 ) 2022 7,346 (10,467 ) 58 (3,063 ) 2023 7,053 (8,192 ) 58 (1,081 ) Thereafter 49,816 (28,374 ) 288 21,730 Total $ 88,577 $ (110,049 ) $ 578 $ (20,894 )

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt	A summary of the Company’s consolidated indebtedness is as follows (dollars in thousands): Interest Rate at Carrying Value at December 31, December 31, Maturity Date at December 31, December 31, 2018 2017 December 31, 2018 2018 2017 Mortgages Payable Core Fixed Rate 3.88%-6.00% 3.88%-5.89% Feb 2024 - Apr 2035 $ 178,271 $ 179,870 Core Variable Rate - Swapped ( a) 3.41%-5.67% 3.41%-5.67% Jan 2023 - Nov 2028 82,583 74,152 Total Core Mortgages Payable 260,854 254,022 Fund II Fixed Rate 1.00%-4.75% 1.00%-4.75% May 2020 - Aug 2042 205,262 205,262 Fund II Variable Rate - Swapped ( a) 4.27% 4.27% Nov 2021 19,325 19,560 Total Fund II Mortgages Payable 224,587 224,822 Fund III Variable Rate LIBOR+2.65%-LIBOR+4.65% Prime+0.50%-LIBOR+4.65% Jun 2020 - Dec 2021 90,096 65,866 Fund IV Fixed Rate 3.40%-4.50% 3.40%-4.50% Oct 2025 - Jun 2026 8,189 10,503 Fund IV Variable Rate LIBOR+1.60%-LIBOR+3.95% LIBOR+1.70%-LIBOR+3.95% Feb 2019 - Aug 2021 233,065 250,584 Fund IV Variable Rate - Swapped ( a) 3.67%-4.23% 3.67%-4.23% May 2019 - Dec 2022 71,841 86,851 Total Fund IV Mortgages Payable 313,095 347,938 Fund V Variable Rate LIBOR+2.15%-LIBOR+2.25% LIBOR+2.25% Oct 2020 - Jan 2021 51,506 28,613 Fund V Variable Rate - Swapped (a) 4.61%-4.78% — Feb 2021 - Jun 2021 86,570 — Total Fund V Mortgage Payable 138,076 28,613 Net unamortized debt issuance costs (10,173 ) (12,943 ) Unamortized premium 753 856 Total Mortgages Payable $ 1,017,288 $ 909,174 Unsecured Notes Payable Core Term Loans LIBOR+1.25% — Mar 2023 $ 383 $ — Core Variable Rate Unsecured Term Loans - Swapped (a) 2.49%-4.05% 2.54%-3.59% Mar 2023 349,617 300,000 Total Core Unsecured Notes Payable 350,000 300,000 Fund II Unsecured Notes Payable LIBOR+1.65% LIBOR+1.40% Sep 2020 40,000 31,500 Fund IV Term Loan/Subscription Facility LIBOR+1.65%-LIBOR+2.75% LIBOR+1.65%-LIBOR+2.75% Oct 2019 - Dec 2019 40,825 40,825 Fund V Subscription Facility LIBOR+1.60% LIBOR+1.60% May 2020 102,800 103,300 Net unamortized debt issuance costs (368 ) (1,890 ) Total Unsecured Notes Payable $ 533,257 $ 473,735 Unsecured Line of Credit Core Unsecured Line of Credit LIBOR+1.35% LIBOR+1.40% Mar 2022 $ — $ 18,048 Core Unsecured Line of Credit - Swapped (a) 4.15%-5.02% 4.20%-5.07% Mar 2022 — 23,452 Total Unsecured Line of Credit $ — $ 41,500 Total Debt - Fixed Rate (b) $ 1,001,658 $ 899,650 Total Debt - Variable Rate (c) 558,675 538,736 Total Debt 1,560,333 1,438,386 Net unamortized debt issuance costs (10,541 ) (14,833 ) Unamortized premium 753 856 Total Indebtedness $ 1,550,545 $ 1,424,409 (a) At December 31, 2018, the stated rates ranged from LIBOR + 1.70% to LIBOR +1.90% for Core variable-rate debt; LIBOR + 1.39% for Fund II variable-rate debt; LIBOR + 2.65% to LIBOR + 4.65% for Fund III variable-rate debt; LIBOR + 1.60% to LIBOR +3.95% for Fund IV variable-rate debt; LIBOR + 2.15% to LIBOR + 2.25% for Fund V variable-rate debt; LIBOR + 1.25% for Core variable-rate unsecured term loans; and LIBOR + 1.35% for Core variable-rate unsecured lines of credit. (b) Includes $609.9 million and $504.0 million, respectively, of variable-rate debt that has been fixed with interest rate swap agreements as of the periods presented. (c) Includes $143.8 million and $141.1 million, respectively, of variable-rate debt that is subject to interest cap agreements. Credit Facility On February 20, 2018, the Company entered into a $500.0 million senior unsecured credit facility (the “Credit Facility”), comprised of a $150.0 million senior unsecured revolving credit facility (the “Revolver”) which bears interest at LIBOR + 1.35%, and a $350.0 million senior unsecured term loan (the “Term Loan”) which bears interest at LIBOR + 1.25%. The Credit Facility refinanced the Company’s existing $300.0 million credit facility (comprised of the $150.0 million Core unsecured revolving line of credit and the $150.0 million term loan), $150.0 million in Core unsecured term loans and repaid a $40.4 million mortgage secured by its 664 North Michigan Property. The Revolver and Term Loans mature on March 31, 2022 and March 31, 2023, respectively. Mortgages Payable During the year ended December 31, 2018, the Company obtained four new Fund V mortgages totaling $109.5 million with a weighted-average interest rate of LIBOR + 1.99% collateralized by four properties and maturing in 2021. In addition, the Company obtained a $73.5 million Core mortgage with an interest rate of LIBOR + 1.50% collateralized by one property and maturing in 2028. As of December 31, 2018, the Company had drawn $50.0 million on this loan. The Company entered into interest rate swap contracts to effectively fix the variable portion of the interest rates of four of these obligations with a notional value of $136.6 million at an interest rate of 2.86%. In addition, the Company drew down $24.6 million on a Fund III construction loan. During the year ended December 31, 2018, the Company repaid one Core mortgage in full, which had a balance of $40.4 million and an interest rate of LIBOR + 1.65%, and three Fund IV mortgages in full, totaling $27.2 million with a weighted-average interest rate of LIBOR + 2.81%. The Company also made scheduled principal payments of $6.7 million during the year. At December 31, 2018 and December 31, 2017, the Company’s mortgages were collateralized by 43 and 42 properties, respectively, and the related tenant leases. Certain loans are cross-collateralized and contain cross-default provisions. The loan agreements contain customary representations, covenants and events of default. Certain loan agreements require the Company to comply with affirmative and negative covenants, including the maintenance of debt service coverage and leverage ratios. A portion of the Company’s variable-rate mortgage debt has been effectively fixed through certain cash flow hedge transactions ( Note 8 The mortgage loan related to Brandywine Holdings in the Company’s Core Portfolio, which was originated in June 2006 and had an original principal amount of $26.3 million, was in default and subject to litigation at December 31, 2018 and December 31, 2017. This loan bears interest at 6.00%, excluding default interest of 5%, and is collateralized by a property, in which the Company holds a 22% controlling interest. In April 2017, the lender on this mortgage initiated a lawsuit against the Company for the full balance of the principal, accrued interest as well as penalties and fees. The Company believes it has valid defenses and intends to vigorously defend itself. Unsecured Notes Payable Unsecured notes payable for which total availability was $62.3 million and $70.3 million at December 31, 2018 and December 31, 2017, respectively, are comprised of the following: • As discussed above, the Core unsecured term loans totaling $300.0 million were refinanced in February 2018, into one $350.0 million term loan with an interest rate of LIBOR+ 1.25% and maturing in March 2023. The outstanding balance of the Core term loans was $350.0 million and $300.0 million, respectively, at December 31, 2018 and December 31, 2017. During the year ended December 31, 2018, the Company entered into an interest rate swap contract to effectively fix the variable portion of the interest rate with a notional value of $50.0 million at an interest rate of 2.80%. The Company previously entered into swap agreements fixing the rates of the remaining Core term loans. • Fund II has a $40.0 million term loan secured by the real estate assets of City Point Phase II and guaranteed by the Company and the Operating Partnership. The outstanding balance of the Fund II term loan was $40.0 million and $31.5 million at December 31, 2018 and December 31, 2017, respectively. Total availability was $0.0 and $8.5 million at December 31, 2018 and December 31, 2017, respectively. • At Fund IV there are a $41.8 million bridge facility and a $21.5 million subscription line. The outstanding balance of the Fund IV bridge facility was $40.8 million at each of December 31, 2018 and December 31, 2017. Total availability was $1.0 million at each of December 31, 2018 and December 31, 2017. The outstanding balance of the Fund IV subscription line was $0.0 million and total available credit was $14.1 million at each of December 31, 2018 and December 31, 2017, reflecting letters of credit of $7.4 million. • Fund V has a $150.0 million subscription line collateralized by Fund V’s unfunded capital commitments and guaranteed by the Operating Partnership. The outstanding balance and total available credit of the Fund V subscription line was $102.8 million and $47.2 million, respectively at December 31, 2018. The outstanding balance and total available credit of the Fund V subscription line was $103.3 million and $46.7 million, respectively at December 31, 2017. Unsecured Revolving Line of Credit As discussed above, the Core unsecured revolving line of credit was refinanced in February 2018. The Company had a total of $137.7 million and $96.2 million, respectively, available under its $150.0 million Core unsecured revolving lines of credit reflecting borrowings of $0.0 and $41.5 million, respectively, and letters of credit of $12.3 million at each of December 31, 2018 and December 31, 2017. At December 31, 2017, a portion of the Core unsecured revolving line of credit was swapped to a fixed rate. Scheduled Debt Principal Payments The scheduled principal repayments of the Company’s consolidated indebtedness, as of December 31, 2018 are as follows (in thousands): Year Ending December 31, 2019 $ 219,118 2020 527,304 2021 180,511 2022 48,528 2023 370,680 Thereafter 214,192 1,560,333 Unamortized premium 753 Net unamortized debt issuance costs (10,541 ) Total indebtedness $ 1,550,545 See Note 4

Financial Instruments and Fair

Financial Instruments and Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Value Measurements	The fair value of an asset is defined as the exit price, which is the amount that would either be received when an asset is sold or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The guidance establishes a three-tier fair value hierarchy based on the inputs used in measuring fair value. These tiers are: Level 1, for which quoted market prices for identical instruments are available in active markets, such as money market funds, equity securities, and U.S. Treasury securities; Level 2, for which there are inputs other than quoted prices included within Level 1 that are observable for the instrument, such as certain derivative instruments including interest rate caps and interest rate swaps; and Level 3, for financial instruments or other assets/liabilities that do not fall into Level 1 or Level 2 and for which little or no market data exists, therefore requiring the Company to develop its own assumptions. Items Measured at Fair Value on a Recurring Basis The methods and assumptions described below were used to estimate the fair value of each class of financial instrument. For significant Level 3 items, the Company has also provided the unobservable inputs along with their weighted-average ranges. Money Market Funds — The Company has money market funds, which are included in Cash and cash equivalents in the consolidated financial statements, are comprised of government securities and/or U.S. Treasury bills. These funds were classified as Level 1 as we used quoted prices from active markets to determine their fair values. Derivative Assets — The Company has derivative assets, which are included in Other assets, net in the consolidated financial statements, are comprised of interest rate swaps and caps. The derivative instruments were measured at fair value using readily observable market inputs, such as quotations on interest rates, and were classified as Level 2 as these instruments are custom, over-the-counter contracts with various bank counterparties that are not traded in an active market. See “Derivative Financial Instruments,” below. Derivative Liabilities — The Company has derivative liabilities, which are included in Accounts payable and other liabilities in the consolidated financial statements, are comprised of interest rate swaps and caps. These derivative instruments were measured at fair value using readily observable market inputs, such as quotations on interest rates, and were classified as Level 2 because they are custom, over-the-counter contracts with various bank counterparties that are not traded in an active market. See “Derivative Financial Instruments,” below. The Company did not have any transfers into or out of Level 1, Level 2, and Level 3 measurements during the year ended December 31, 2018 or 2017. The following table presents the Company’s fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis (in thousands): December 31, 2018 December 31, 2017 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Money Market Funds $ 4,504 $ — $ — $ 3 $ — $ — Derivative financial instruments — 7,018 — — 4,402 — Liabilities Derivative financial instruments — 7,304 — — 1,467 — In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. Items Measured at Fair Value on a Nonrecurring Basis (Including Impairment Charges) The Company did not record any impairment charges during the year ended December 31, 2018. During the year ended December 31, 2017, the Company recognized an impairment charge of $3.8 million, inclusive of an amount attributable to a noncontrolling interest of $2.7 million, on a property classified as held for sale at September 30, 2017, in order to reduce the carrying value of the property to its estimated fair value. In addition, the Company recognized an impairment charge of $10.6 million, inclusive of an amount attributable to a noncontrolling interest of $7.6 million, on a property classified as held for sale at December 31, 2017 ( Note 2 Derivative Financial Instruments The Company had the following interest rate swaps for the periods presented (dollars in thousands): Strike Rate Fair Value Derivative Instrument Aggregate Notional Amount Effective Date Maturity Date Low High Balance Sheet Location December 31, 2018 December 31, 2017 Core Interest Rate Swaps $ 111,117 Dec 2012 - Jul 2020 Dec 2022 - Jul 2030 2.80 % — 3.77 % Other Liabilities (a) $ (6,332 ) $ (1,438 ) Interest Rate Swaps 321,083 Feb 2013 - Dec 2017 Nov 2019 - Jul 2027 1.24 % — 3.77 % Other Assets 6,022 4,076 $ 432,200 $ (310 ) $ 2,638 Fund II Interest Rate Swap $ 19,325 Oct 2014 Nov 2021 2.88 % — 2.88 % Other Assets $ 108 $ — Interest Rate Swap — Oct 2014 Nov 2021 2.88 % — 2.88 % Other Liabilities — (29 ) $ 19,325 $ 108 $ (29 ) Fund III Interest Rate Cap $ 58,000 Dec 2016 Jan 2020 3.00 % — 3.00 % Other Assets $ 8 $ 14 Fund IV Interest Rate Swaps $ 71,841 Mar 2017 - Nov 2017 Mar 2020 - Dec 2022 1.82 % — 2.11 % Other Assets $ 851 $ 295 Interest Rate Caps 108,900 July 2016 - Nov 2016 Aug 2019 - Dec 2019 3.00 % — 3.00 % Other Assets 8 17 $ 180,741 $ 859 $ 312 Fund V Interest Rate Swap $ 16,900 Jan 2018 Feb 2021 2.41 % — 2.41 % Other Assets $ 21 $ — Interest Rate Swaps 69,670 Jun 2018 Jun 2021 - Jun 2023 2.78 % — 2.88 % Other Liabilities (972 ) — $ 86,570 $ (951 ) $ — Total asset derivatives $ 7,018 $ 4,402 Total liability derivatives $ (7,304 ) $ (1,467 ) (a) Includes two swaps with a fair value of ($2.9) million which were acquired during July 2018 and are not effective until July 2020. All of the Company’s derivative instruments have been designated as cash flow hedges and hedge the future cash outflows on variable-rate debt ( Note 7 Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and, from time to time, through the use of derivative financial instruments. The Company enters into derivative financial instruments to manage exposures that result in the receipt or payment of future known and uncertain cash amounts, the The Company is exposed to credit risk in the event of non-performance by the counterparties to the swaps if the derivative position has a positive balance. The Company believes it mitigates its credit risk by entering into swaps with major financial institutions. The Company continually monitors and actively manages interest costs on its variable-rate debt portfolio and may enter into additional interest rate swap positions or other derivative interest rate instruments based on market conditions. The Company has not entered, and does not plan to enter, into any derivative financial instruments for trading or speculative purposes. The following table presents the location in the financial statements of the income (losses) recognized related to the Company’s cash flow hedges (in thousands): Year Ended December 31, 2018 2017 2016 Amount of (loss) income recognized in other comprehensive income $ (2,659 ) $ 634 $ (646 ) Amount of loss subsequently reclassified to earnings 71 3,317 4,576 Credit Risk-Related Contingent Features The Company has agreements with each of its swap counterparties that contain a provision whereby if the Company defaults on certain of its unsecured indebtedness, the Company could also be declared in default on its swaps, resulting in an acceleration of payment under the swaps. Other Financial Instruments The Company’s other financial instruments had the following carrying values and fair values as of the dates shown (dollars in thousands, inclusive of amounts attributable to noncontrolling interests where applicable): December 31, 2018 December 31, 2017 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Notes Receivable (a) 3 $ 109,613 $ 107,370 $ 153,829 $ 151,712 Mortgage and Other Notes Payable (a) 3 1,026,708 1,021,075 921,261 921,891 Investment in non-traded equity securities (b) 3 — 23,208 — 22,824 Unsecured notes payable and Unsecured line of credit (c) 2 533,625 533,954 517,125 515,330 (a) The Company determined the estimated fair value of these financial instruments using a discounted cash flow model with rates that take into account the credit of the borrower or tenant, where applicable, and interest rate risk. The Company also considered the value of the underlying collateral, taking into account the quality of the collateral, the credit quality of the borrower, the time until maturity and the current market interest rate environment. (b) Represents Fund II’s cost-method investment in Albertson’s supermarkets ( Note 4 (c) The Company determined the estimated fair value of the unsecured notes payable and unsecured line of credit using quoted market prices in an open market with limited trading volume where available. In cases where there was no trading volume, the Company determined the estimated fair value using a discounted cash flow model using a rate that reflects the average yield of similar market participants. The Company’s cash and cash equivalents, restricted cash, accounts receivable, accounts payable and certain financial instruments included in other assets and other liabilities had fair values that approximated their carrying values at December 31, 2018.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	The Company is involved in various matters of litigation arising in the normal course of business. While the Company is unable to predict with certainty the amounts involved, the Company’s management and counsel are of the opinion that, when such litigation is resolved, the Company’s resulting liability, if any, will not have a significant effect on the Company’s consolidated financial position, results of operations, or liquidity. The Company's policy is to accrue legal expenses as they are incurred. Commitments and Guaranties In conjunction with the development and expansion of various properties, the Company has entered into agreements with general contractors for the construction or development of properties aggregating approximately $55.5 million and $98.7 million as of December 31, 2018 and December 31, 2017, respectively. At each of December 31, 2018 and December 31, 2017, the Company had letters of credit outstanding of $19.7 million. The Company has not recorded any obligation associated with these letters of credit. The majority of the letters of credit are collateral for existing indebtedness and other obligations of the Company .

Shareholders' Equity, Noncontro

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income	12 Months Ended
	Dec. 31, 2018
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract]
Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income	Common Shares and Units The Company completed the following transactions in its common shares during the year ended December 31, 2018: • The Company withheld 3,288 Restricted Shares to pay the employees’ statutory minimum income taxes due on the value of the portion of their Restricted Shares that vested. • The Company recognized Common Share and Common OP Unit-based compensation totaling $8.4 million in connection with Restricted Shares and Units ( Note 13 The Company completed the following transactions in its common shares during the year ended December 31, 2017: • The Company withheld 4,314 Restricted Shares to pay the employees’ statutory minimum income taxes due on the value of the portion of their Restricted Shares that vested. • The Company recognized Common Share and Common OP Unit-based compensation totaling $8.4 million in connection with Restricted Shares and Units ( Note 13 • At the May 10 Shareholder Meeting, Shareholders approved an amendment to the Company’s Declaration of Trust to increase the authorized share capital of the Company from 100 million shares of beneficial interest to 200 million shares which became effective on July 24, 2017. Share Repurchases During 2018, the Company revised its share repurchase program. The new share repurchase program authorizes management, at its discretion, to repurchase up to $200.0 million of its outstanding Common Shares. The program may be discontinued or extended at any time. The Company repurchased 2,294,235 shares for $55.1 million, inclusive of $0.1 million of fees, during the year ended December 31, 2018. The Company did not repurchase any shares during the year ended December 31, 2017. As of December 31, 2018, management may repurchase up to approximately $144.9 million of the Company’s outstanding Common Shares under this program. Dividends and Distributions On November 13, 2018, the Board of Trustees declared an increase of $0.01 to the $0.28 per Common Share regular quarterly cash dividend, which was paid on January 15, 2019 to holders of record as of December 31, 2018. On August 7, 2018, the Board of Trustees declared a regular quarterly cash dividend of $0.27 per Common Share, which was paid on October 15, 2018 to the holders of record as of September 28, 2018. On May 11, 2018, the Board of Trustees declared a regular quarterly cash dividend of $0.27 per Common Share, which was paid on July 13, 2018 to holders of record as of June 29, 2018. On February 27, 2018, the Board of Trustees declared a regular quarterly cash dividend of $0.27 per Common Share, which was paid on April 13, 2018 to holders of record as of March 30, 2018. On November 8, 2017, the Board of Trustees declared an increase of $0.01 to the $0.27 per Common Share regular quarterly cash dividend, which was paid on January 13, 2018 to holders of record as of December 29, 2017. Accumulated Other Comprehensive Income The following table sets forth the activity in accumulated other comprehensive income for the years ended December 31, 2018, 2017 and 2016 (in thousands): Gains or Losses on Derivative Instruments Balance at January 1, 2018 $ 2,614 Other comprehensive loss before reclassifications (2,659 ) Reclassification of realized interest on swap agreements 71 Net current period other comprehensive loss (2,588 ) Net current period other comprehensive loss attributable to noncontrolling interests 490 Balance at December 31, 2018 $ 516 Balance at January 1, 2017 $ (798 ) Other comprehensive income before reclassifications 634 Reclassification of realized interest on swap agreements 3,317 Net current period other comprehensive income 3,951 Net current period other comprehensive income attributable to noncontrolling interests (539 ) Balance at December 31, 2017 $ 2,614 Balance at January 1, 2016 $ (4,463 ) Other comprehensive loss before reclassifications (646 ) Reclassification of realized interest on swap agreements 4,576 Net current period other comprehensive income 3,930 Net current period other comprehensive income attributable to noncontrolling interests (265 ) Balance at December 31, 2016 $ (798 ) Noncontrolling Interests The following table summarizes the change in the noncontrolling interests for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands): Noncontrolling Interests in Operating Partnership (a) Noncontrolling Interests in Partially-Owned Affiliates (b) Total Balance at January 1, 2018 $ 102,921 $ 545,519 $ 648,440 Distributions declared of $1.09 per Common OP Unit (6,888 ) — (6,888 ) Net income (loss) for the year ended December 31, 2018 2,572 (49,709 ) (47,137 ) Conversion of 117,978 Common OP Units to Common Shares by limited partners of the Operating Partnership (2,068 ) — (2,068 ) Other comprehensive loss - unrealized loss on valuation of swap agreements (129 ) (681 ) (810 ) Reclassification of realized interest expense on swap agreements (3 ) 323 320 Noncontrolling interest contributions — 47,560 47,560 Noncontrolling interest distributions — (24,793 ) (24,793 ) Employee Long-term Incentive Plan Unit Awards 12,374 — 12,374 Rebalancing adjustment (c) (4,556 ) — (4,556 ) Balance at December 31, 2018 $ 104,223 $ 518,219 $ 622,442 Balance at January 1, 2017 $ 95,422 $ 494,126 $ 589,548 Distributions declared of $1.05 per Common OP Unit (6,453 ) — (6,453 ) Net income (loss) for the year ended December 31, 2017 4,159 (1,321 ) 2,838 Conversion of 81,453 Common OP Units and 5,000 Preferred OP Units to Common Shares by limited partners of the Operating Partnership (1,541 ) — (1,541 ) Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements 85 (232 ) (147 ) Reclassification of realized interest expense on swap agreements 141 545 686 Noncontrolling interest contributions — 85,206 85,206 Noncontrolling interest distributions — (32,805 ) (32,805 ) Employee Long-term Incentive Plan Unit Awards 10,457 — 10,457 Rebalancing adjustment (c) 651 — 651 Balance at December 31, 2017 $ 102,921 $ 545,519 $ 648,440 Balance at January 1, 2016 $ 96,340 $ 324,526 $ 420,866 Distributions declared of $1.16 per Common OP Unit (6,753 ) — (6,753 ) Net income for the year ended December 31, 2016 5,002 56,814 61,816 Conversion of 351,250 Common OP Units to Common Shares by limited partners of the Operating Partnership (7,892 ) — (7,892 ) Issuance of Common and Preferred OP Units to acquire real estate 31,429 — 31,429 Acquisition of noncontrolling interests — (25,925 ) (25,925 ) Other comprehensive loss - unrealized loss on valuation of swap agreements (43 ) (289 ) (332 ) Change in control of previously unconsolidated investment — (75,713 ) (75,713 ) Reclassification of realized interest expense on swap agreements 223 374 597 Noncontrolling interest contributions — 295,108 295,108 Noncontrolling interest distributions — (80,769 ) (80,769 ) Employee Long-term Incentive Plan Unit Awards 12,768 — 12,768 Rebalancing adjustment (c) (35,652 ) — (35,652 ) Balance at December 31, 2016 $ 95,422 $ 494,126 $ 589,548 (a) Noncontrolling interests in the Operating Partnership are comprised of (i) the limited partners’ 3,329,640, 3,328,873 and 3,308,875 Common OP Units at December 31, 2018, 2017 and 2016, respectively; (ii) 188 Series A Preferred OP Units at December 31, 2018, 2017 and 2016; (iii) 136,593 Series C Preferred OP Units at December 31, 2018, 2017 and 2016; and (iv) 2,569,044, 2,274,147 and 1,997,099 LTIP units at December 31, 2018, 2017 and 2016, respectively, as discussed in Share Incentive Plan (). Distributions declared for Preferred OP Units are reflected in net income (loss) in the table above. (b) Noncontrolling interests in partially-owned affiliates comprise third-party interests in Funds II, III, IV and V, and Mervyns I and II, and six other subsidiaries. (c) Adjustment reflects the difference between the fair value of the consideration received or paid and the book value of the Common Shares, Common OP Units, Preferred OP Units, and LTIP Units involving changes in ownership (the “Rebalancing”). Preferred OP Units There were no issuances of Preferred OP Units during the year ended December 31, 2018. In 1999 the Operating Partnership issued 1,580 Series A Preferred OP Units in connection with the acquisition of a property, which have a stated value of $1,000 per unit, and are entitled to a preferred quarterly distribution of the greater of (i) $22.50 ( 9% annually) per Series A Preferred OP Unit or (ii) the quarterly distribution attributable to a Series A Preferred OP Unit if such unit was converted into a Common OP Unit. Through December 31, 2018, 1,392 Series A Preferred OP Units were converted into 185,600 Common OP Units and then into Common Shares. The 188 remaining Series A Preferred OP Units are currently convertible into Common OP Units based on the stated value divided by $7.50. Either the Company or the holders can currently call for the conversion of the Series A Preferred OP Units at the lesser of $7.50 or the market price of the Common Shares as of the conversion date. During 2016, the Operating Partnership issued 442,478 Common OP Units and 141,593 Series C Preferred OP Units to a third party to acquire Gotham Plaza ( Note 4

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	Operating Leases The Company is engaged in the operation of shopping centers and other retail properties that are either owned or, with respect to certain shopping centers, operated under long-term ground leases that expire at various dates through June 20, 2066, with renewal options. Space in the shopping centers is leased to tenants pursuant to agreements that provide for terms ranging generally from one month to sixty years and generally provide for additional rents based on certain operating expenses as well as tenants’ sales volumes. The Company leases land at six of its shopping centers, which are accounted for as operating leases and generally provide the Company with renewal options. Ground rent expense was $1.7 million, $1.4 million and $1.2 million (including capitalized ground rent at a property under development of $0, $0.1 million and $0.6 million) for the years ended December 31, 2018, 2017 and 2016 respectively. The leases terminate at various dates between 2020 and 2066. These leases provide the Company with options to renew for additional terms aggregating up to 22 years. The Company also leases space for its corporate office. Office rent expense under these leases was $1.0 million for each of the years ended December 31, 2018, 2017 and 2016, respectively. Capital Lease During 2016, the Company entered into a 49-year master lease, which is accounted for as a capital lease. During the years ended December 31, 2018, 2017 and 2016, payments for this lease totaled $2.5 million, $2.5 million and $1.3 million, respectively. The property under the capital lease is included in Note 2 Lease Obligations The scheduled future minimum (i) rental revenues from rental properties under the terms of non-cancelable tenant leases greater than one year (assuming no new or renegotiated leases or option extensions for such premises) and (ii) rental payments under the terms of all non-cancelable operating and capital leases in which the Company is the lessee, principally for office space, land and equipment, as of December 31, 2018, are summarized as follows (in thousands): Year Ending December 31, Minimum Rental Revenues Minimum Rental Payments 2019 $ 187,158 $ 4,775 2020 178,691 4,571 2021 159,749 4,354 2022 139,294 4,404 2023 121,456 4,425 Thereafter 513,853 180,618 Total $ 1,300,201 $ 203,147 A ground lease expiring during 2078 provides the Company with an option to purchase the underlying land during 2031. If the Company does not exercise the option, the rents that will be due are based on future values and as such are not determinable at this time. Accordingly, the above table does not include rents for this lease beyond 2020. During the years ended December 31, 2018, 2017 and 2016, no single tenant collectively comprised more than 10% of the Company’s consolidated total revenues.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Reporting	The Company has three reportable segments: Core Portfolio, Funds and Structured Financing. The Company’s Core Portfolio consists primarily of high-quality retail properties located primarily in high-barrier-to-entry, densely-populated metropolitan areas with a long-term investment horizon. The Company’s Funds hold primarily retail real estate in which the Company co-invests with high-quality institutional investors. The Company’s Structured Financing segment consists of earnings and expenses related to notes and mortgages receivable which are held within the Core Portfolio or the Funds ( Note 3 The following tables set forth certain segment information for the Company (in thousands): As of or for the Year Ended December 31, 2018 Core Portfolio Funds Structured Financing Unallocated Total Revenues $ 167,894 $ 94,319 $ — $ — $ 262,213 Depreciation and amortization (60,903 ) (56,646 ) — — (117,549 ) Property operating expenses, other operating and real estate taxes (45,138 ) (37,642 ) — — (82,780 ) General and administrative expenses — — — (34,343 ) (34,343 ) Operating income 61,853 31 — (34,343 ) 27,541 Gain on disposition of properties — 5,140 — — 5,140 Interest income — — 13,231 — 13,231 Equity in earnings of unconsolidated affiliates inclusive of gains on disposition of properties (a) 7,415 1,887 — — 9,302 Interest expense (27,575 ) (42,403 ) — — (69,978 ) Income tax provision — — — (934 ) (934 ) Net income 41,693 (35,345 ) 13,231 (35,277 ) (15,698 ) Net loss attributable to noncontrolling interests 752 46,385 — — 47,137 Net income attributable to Acadia $ 42,445 $ 11,040 $ 13,231 $ (35,277 ) $ 31,439 Real estate at cost $ 2,069,439 $ 1,628,366 $ — $ — $ 3,697,805 Total assets $ 2,232,695 $ 1,616,472 $ 109,613 $ — $ 3,958,780 Cash paid for acquisition of real estate $ 1,343 $ 146,642 $ — $ — $ 147,985 Cash paid for development and property improvement costs $ 32,662 $ 62,172 $ — $ — $ 94,834 As of or for the Year Ended December 31, 2017 Core Portfolio Funds Structured Financing Unallocated Total Revenues $ 169,975 $ 80,287 $ — $ — $ 250,262 Depreciation and amortization (61,705 ) (43,229 ) — — (104,934 ) Property operating expenses, other operating and real estate taxes (45,349 ) (34,449 ) — — (79,798 ) General and administrative expenses — — — (33,756 ) (33,756 ) Impairment charge — (14,455 ) — — (14,455 ) Operating income (loss) 62,921 (11,846 ) — (33,756 ) 17,319 Gain on disposition of properties — 48,886 — — 48,886 Interest income — — 29,143 — 29,143 Equity in earnings of unconsolidated affiliates inclusive of gains on disposition of properties (a) 3,735 19,636 — — 23,371 Interest expense (28,618 ) (30,360 ) — — (58,978 ) Gain on change in control 5,571 — — — 5,571 Income tax provision — — — (1,004 ) (1,004 ) Net income 43,609 26,316 29,143 (34,760 ) 64,308 Net income attributable to noncontrolling interests (1,107 ) (1,731 ) — — (2,838 ) Net income attributable to Acadia $ 42,502 $ 24,585 $ 29,143 $ (34,760 ) $ 61,470 Real estate at cost $ 2,032,485 $ 1,433,997 $ — $ — $ 3,466,482 Total assets $ 2,305,663 $ 1,500,755 $ 153,829 $ — $ 3,960,247 Cash paid for acquisition of real estate $ — $ 200,429 $ — $ — $ 200,429 Cash paid for development and property improvement costs $ 42,026 $ 66,116 $ — $ — $ 108,142 As of or for the Year Ended December 31, 2016 Core Portfolio Funds Structured Financing Unallocated Total Revenues $ 150,211 $ 39,728 $ — $ — $ 189,939 Depreciation and amortization (54,582 ) (15,429 ) — — (70,011 ) Property operating expenses, other operating and real estate taxes (39,598 ) (17,793 ) — — (57,391 ) General and administrative expenses — — — (40,648 ) (40,648 ) Operating income 56,031 6,506 — (40,648 ) 21,889 Gain on disposition of properties — 81,965 — — 81,965 Interest income — — 25,829 — 25,829 Equity in earnings of unconsolidated affiliates inclusive of gains on disposition of properties (a) 3,774 35,675 — — 39,449 Interest expense (27,435 ) (7,210 ) — — (34,645 ) Income tax benefit — — — 105 105 Net income 32,370 116,936 25,829 (40,543 ) 134,592 Net income attributable to noncontrolling interests (3,411 ) (58,405 ) — — (61,816 ) Net income attributable to Acadia $ 28,959 $ 58,531 $ 25,829 $ (40,543 ) $ 72,776 Real estate at cost $ 1,982,763 $ 1,399,237 $ — $ — $ 3,382,000 Total assets $ 2,271,620 $ 1,448,177 $ 276,163 $ — $ 3,995,960 Cash paid for acquisition of real estate $ 323,880 $ 171,764 $ — $ — $ 495,644 Cash paid for development and property improvement costs $ 13,434 $ 136,000 $ — $ — $ 149,434 (a) Equity in earnings of unconsolidated affiliates for the Core segment includes $5.8 million, $1.9 million and $0.9 million related to one unconsolidated affiliate, Town Center, for the years ended December 31, 2018, 2017 and 2016, respectively. During 2017 and 2018, the Company increased its ownership in its Town Center investment from 22.22% to 75.22% (). Effective in 2018, the Company consolidated a property association entity that incurs all property-related costs associated with Town Center. Such costs aggregated $0.7 million for the year ended December 31, 2018 and are included in depreciation and amortization and property operating expenses other operating and real estate taxes within the Core segment.

Share Incentive and Other Compe

Share Incentive and Other Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share Incentive and Other Compensation	Share Incentive Plan The Second Amended and Restated 2006 Incentive Plan (the “Share Incentive Plan”) authorizes the Company to issue options, Restricted Shares, LTIP Units and other securities (collectively “Awards”) to, among others, the Company’s officers, trustees and employees. At December 31, 2018 a total of 1,176,340 shares remained available to be issued under the Share Incentive Plan. Restricted Shares and LTIP Units During the year ended December 31, 2018, the Company issued 381,821 LTIP Units and 5,767 Restricted Share Units to employees of the Company pursuant to the Share Incentive Plan. The fair value of the Restricted Share Units and LTIP Units as of the grant date was $10.4 million. Certain of these equity awards were granted in performance-based Restricted Share Units or LTIP Units to market conditions as described below (“2018 Performance Shares”). These awards were measured at their fair value on the grant date, incorporating the following factors: • A portion of these annual equity award is granted in performance-based Restricted Share Units or LTIP Units that may be earned based on the Company’s attainment of specified relative total shareholder returns (“Relative TSR”) hurdles. • In the event the Relative TSR percentile falls between the 25th percentile and the 50th percentile, Relative TSR vesting percentage is determined using a straight-line linear interpolation between 50% and 100% and in the event that the Relative TSR percentile falls between the 50th percentile and 75th percentile, the Relative TSR vesting percentage is determined using a straight-line linear interpolation between 100% and 200%. • Two-thirds (2/3) of the performance-based LTIP Units will vest based on the Company’s total shareholder return (“TSR”) for the three -year forward-looking performance period ending December 31, 2020 relative to the constituents of the SNL U.S. REIT Retail Shopping Center Index and one-third (1/3) on the Company’s TSR for the three-year forward-looking performance period as compared to the constituents of the SNL U.S. REIT Retail Index (both on a non-weighted basis). • If the Company’s performance fails to achieve the aforementioned hurdles at the culmination of the three-year performance period, all performance-based shares will be forfeited. Any earned performance-based shares vest 60% at the end of the performance period, with the remaining 40% of shares vesting ratably over the next two years. For valuation of the 2018 Performance Shares, a Monte Carlo simulation was used to estimate the fair values based on probability of satisfying the market conditions and the projected share prices at the time of payments, discounted to the valuation dates over the three-year performance periods. The assumptions include volatility (18.0%) and risk-free interest rates (2.4%). Total long-term incentive compensation expense, including the expense related to the Share Incentive Plan, was In addition, during the quarter ended December 31, 2018, in connection with the retirement of an executive, an additional 26,632 LTIP Units were issued. The value of these LTIP Units was $0.6 million and was recognized as compensation expense in 2018. Also, in connection with this retirement, the Company recognized $1.7 million as compensation expense relating to the acceleration of previously granted LTIP Units. In addition, members of the Board of Trustees (the “Board”) have been issued shares and units under the Share Incentive Plan. During 2018, the Company issued 17,427 LTIP Units and 17,050 Restricted Shares to Trustees of the Company in connection with Trustee fees. Vesting with respect to 8,949 of the LTIP Units and 5,181 of the Restricted Shares will be on the first anniversary of the date of issuance and 8,478 of the LTIP Units and 11,869 of the Restricted Shares vest over three years with 33% vesting on each of the next three anniversaries of the issuance date. The Restricted Shares do not carry voting rights or other rights of Common Shares until vesting and may not be transferred, assigned or pledged until the recipients have a vested non-forfeitable right to such shares. Dividends are not paid currently on unvested Restricted Shares, but are paid cumulatively from the issuance date through the applicable vesting date of such Restricted Shares. Total trustee fee expense, including the expense related to the Share Incentive Plan, was $1.3 million and $1.2 million for the years ended December 31, 2018 and 2017, respectively. In 2009, the Company adopted the Long-Term Investment Alignment Program (the “Program”) pursuant to which the Company may grant awards to employees, entitling them to receive up to 25% of any potential future payments of Promote to the Operating Partnership from Funds III and IV. The Company has granted such awards to employees representing 25% of the potential Promote payments from Fund III to the Operating Partnership and 22.8% of the potential Promote payments from Fund IV to the Operating Partnership. Payments to senior executives under the Program require further Board approval at the time any potential payments are due pursuant to these grants. Compensation relating to these awards will be recognized in each reporting period in which Board approval is granted. As payments to other employees are not subject to further Board approval, compensation relating to these awards will be recorded based on the estimated fair value at each reporting period in accordance with ASC Topic 718, Compensation– Stock Compensation. Compensation expense of $0 and $0.6 million was recognized for the year ended December 31, 2018 and 2017, respectively, related to the Program in connection with Fund III. A summary of the status of the Company’s unvested Restricted Shares and LTIP Units is presented below: Unvested Restricted Shares and LTIP Units Common Restricted Shares Weighted Grant-Date Fair Value LTIP Units Weighted Grant-Date Fair Value Unvested at January 1, 2016 49,899 $ 25.90 1,020,121 $ 23.92 Granted 21,675 33.35 359,484 34.40 Vested (24,886 ) 29.17 (522,680 ) 26.08 Forfeited (189 ) 35.37 (48 ) 35.37 Unvested at December 31, 2016 46,499 $ 27.58 856,877 $ 26.99 Granted 19,442 29.85 310,551 31.80 Vested (23,430 ) 30.47 (257,124 ) 28.27 Forfeited (1,184 ) 32.65 (205 ) 32.49 Unvested at December 31, 2017 41,327 26.92 910,099 28.28 Granted 22,817 23.65 425,880 26.80 Vested (25,261 ) 30.79 (431,827 ) 29.72 Forfeited (428 ) 27.25 (12,266 ) 28.57 Unvested at December 31, 2018 38,455 $ 22.44 891,886 $ 26.87 The weighted-average grant date fair value for Restricted Shares and LTIP Units granted for the years ended December 31, 2018 and 2017 were $26.64 and $31.69, respectively. As of December 31, 2018, there was $14.1 million of total unrecognized compensation cost related to unvested share-based compensation arrangements granted under the Share Incentive Plan. That cost is expected to be recognized over a weighted-average period of 1.6 years. The total fair value of Restricted Shares that vested for the years ended December 31, 2018 and 2017, was $0.8 million and $0.7 million, respectively. The total fair value of LTIP Units that vested during the years ended December 31, 2018 and 2017, was $12.8 million and $7.3 million, respectively. Other Plans On a combined basis, the Company incurred a total of $0.3 million, $0.2 million and $0.2 million related to the following employee benefit plans for each of the years ended December 31, 2018, 2017 and 2016, respectively: Employee Share Purchase Plan The Acadia Realty Trust Employee Share Purchase Plan (the “Purchase Plan”), allows eligible employees of the Company to purchase Common Shares through payroll deductions. The Purchase Plan provides for employees to purchase Common Shares on a quarterly basis at a 15% discount to the closing price of the Company’s Common Shares on either the first day or the last day of the quarter, whichever is lower. A participant may not purchase more the $25,000 in Common Shares per year. Compensation expense will be recognized by the Company to the extent of the above discount to the closing price of the Common Shares with respect to the applicable quarter. A total of 3,495 and 4,514 Common Shares were purchased by employees under the Purchase Plan for the year ended December 31, 2018 and 2017, respectively. Deferred Share Plan During 2006, the Company adopted a Trustee Deferral and Distribution Election, under which the participating Trustees earn deferred compensation. Employee 401(k) Plan The Company maintains a 401(k) plan for employees under which the Company currently matches 50% of a plan participant’s contribution up to 6% of the employee’s annual salary. A plan participant may contribute up to a maximum of 15% of their compensation, up to $18,500, for the year ended December 31, 2018.

Federal Income Taxes

Federal Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal Income Taxes	The Company has elected to qualify as a REIT in accordance with Sections 856 through 860 of the Code, and intends at all times to qualify as a REIT under the Code. To qualify as a REIT, the Company must meet a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its annual REIT taxable income to its shareholders. As a REIT, the Company generally will not be subject to corporate Federal income tax, provided that distributions to its shareholders equal at least the amount of its REIT taxable income as defined under the Code. As the Company distributed sufficient taxable income for the years ended December 31, 2018, 2017 and 2016, no U.S. Federal income or excise taxes were incurred. If the Company fails to qualify as a REIT in any taxable year, it will be subject to Federal income taxes at the regular corporate rates (including any applicable alternative minimum tax) and may not be able to qualify as a REIT for the four subsequent taxable years. Even though the Company qualifies for taxation as a REIT, the Company is subject to certain state and local taxes on its income and property and Federal income and excise taxes on any undistributed taxable income. In addition, taxable income from non-REIT activities managed through the Company’s TRS’s is subject to Federal, state and local income taxes. No more than 20% of the value of our total assets may consist of the securities of one or more taxable REIT subsidiaries. In the normal course of business, the Company or one or more of its subsidiaries is subject to examination by Federal, state and local jurisdictions as well as certain jurisdictions outside the United States, in which it operates, where applicable. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense. For the three years ended December 31, 2018, the Company recognized no material adjustments regarding its tax accounting treatment for uncertain tax provisions. As of December 31, 2018, the tax years that remain subject to examination by the major tax jurisdictions under applicable statutes of limitations are generally the year 2015 and forward. Reconciliation of Net Income to Taxable Income Reconciliation of GAAP net income attributable to Acadia to taxable income is as follows: Year Ended December 31, (in thousands) 2018 2017 2016 Net income attributable to Acadia $ 31,439 $ 61,470 $ 72,776 Deferred cancellation of indebtedness income 2,050 2,050 2,050 Deferred rental and other income (a) 1,222 (934 ) 1,610 Book/tax difference - depreciation and amortization (a) 23,166 21,334 15,189 Straight-line rent and above- and below-market rent adjustments (a) (12,129 ) (10,559 ) (7,882 ) Book/tax differences - equity-based compensation 6,042 5,325 10,307 Joint venture equity in earnings, net (a) 13,905 9,114 (2,011 ) Impairment charges and reserves — — 769 Acquisition costs (a) 326 1,135 5,116 Gains — (5,181 ) — Book/tax differences - miscellaneous (2,821 ) 930 (4,924 ) Taxable income $ 63,200 $ 84,684 $ 93,000 Distributions declared $ 89,122 $ 87,848 $ 91,053 (a) Adjustments from certain subsidiaries and affiliates, which are consolidated for financial reporting but not for tax reporting, are included in the reconciliation item “Joint venture equity in earnings, net.” Characterization of Distributions The Company has determined that the cash distributed to the shareholders for the periods presented is characterized as follows for Federal income tax purposes: Year Ended December 31, 2018 2017 2016 Per Share % Per Share % Per Share % Ordinary income - Non-Section 199A — — % $ 0.82 78 % $ 0.77 66 % Ordinary income - Section 199A $ 0.87 100 % — — % — — % Qualified dividend — — % — — % — — % Capital gain — — % 0.23 22 % 0.39 34 % Total (b) $ 0.87 100 % $ 1.05 100 % $ 1.16 100 % (b) The fourth quarter 2018 regular dividend was $0.28 per common share of which approximately $0.06 was allocable to 2018 and approximately $0.22 is allocable to 2019. Taxable REIT Subsidiaries Income taxes have been provided for using the liability method as required by ASC Topic 740, “Income Taxes.” The Company’s TRS income and provision for income taxes associated with the TRS for the periods presented are summarized as follows (in thousands): Year Ended December 31, 2018 2017 2016 TRS loss before income taxes $ (2,609 ) $ (3,604 ) $ (1,583 ) (Provision) benefit for income taxes: Federal (377 ) (982 ) 378 State and local 26 423 97 TRS net loss before noncontrolling interests (2,960 ) (4,163 ) (1,108 ) Noncontrolling interests 4 8 (9 ) TRS net loss $ (2,956 ) $ (4,155 ) $ (1,117 ) The income tax provision for the Company differs from the amount computed by applying the statutory Federal income tax rate to income before income taxes as follows. Amounts are not adjusted for temporary book/tax differences (in thousands): Year Ended December 31, 2018 2017 2016 Federal tax benefit at statutory tax rate $ (548 ) $ (1,225 ) $ (538 ) TRS state and local taxes, net of Federal benefit (165 ) (190 ) (84 ) Tax effect of: Permanent differences, net 951 1,131 1,663 Prior year over-accrual, net — (1,541 ) — Effect of Tax Cuts and Jobs Act — 1,982 — Other 172 404 (1,516 ) REIT state and local income and franchise taxes 524 443 370 Total provision (benefit) for income taxes $ 934 $ 1,004 $ (105 ) As of December 31, 2018, and 2017, the Company’s deferred tax assets (net of applicable reserves) in its taxable REIT subsidiaries consisted of the following: additional tax basis in RCP investments of $0 and $1.0 million, capital loss carryovers of $0.1 million and $0 and net operating loss carryovers of $2.0 million and $1.1 million, respectively.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Basic earnings per Common Share is computed by dividing net income attributable to Common Shareholders by the weighted average Common Shares outstanding ( Note 10 Diluted earnings per Common Share reflects the potential dilution of the conversion of obligations and the assumed exercises of securities including the effects of restricted share units (“Restricted Share Units”) issued under the Company’s Share Incentive Plans ( Note 13 The effect of the conversion of Common OP Units is not reflected in the computation of basic and diluted earnings per share, as they are exchangeable for Common Shares on a one-for-one basis. The income allocable to such units is allocated on this same basis and reflected as noncontrolling interests in the accompanying consolidated financial statements. As such, the assumed conversion of these units would have no net impact on the determination of diluted earnings per share. Year Ended December 31, (dollars in thousands) 2018 2017 2016 Numerator: Net income attributable to Acadia $ 31,439 $ 61,470 $ 72,776 Less: net income attributable to participating securities (267 ) (642 ) (793 ) Income from continuing operations net of income attributable to participating securities $ 31,172 $ 60,828 $ 71,983 Denominator: Weighted average shares for basic earnings per share 82,080,159 83,682,789 76,231,000 Effect of dilutive securities: Employee unvested restricted shares — 2,682 12,550 Denominator for diluted earnings per share 82,080,159 83,685,471 76,243,550 Basic and diluted earnings per Common Share from continuing operations attributable to Acadia $ 0.38 $ 0.73 $ 0.94 Anti-Dilutive Shares Excluded from Denominator: Series A Preferred OP Units 188 188 188 Series A Preferred OP Units - Common share equivalent 25,067 25,067 25,067 Series C Preferred OP Units 136,593 136,593 141,593 Series C Preferred OP Units - Common share equivalent 474,278 479,978 410,207 Restricted shares 36,879 41,299 50,156

Summary of Quarterly Financial

Summary of Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Financial Information (Unaudited)	16. Summary of Quarterly Financial Information (Unaudited) The quarterly results of operations of the Company for the years ended December 31, 2018 and 2017 are as follows (in thousands, except per share amounts): Three Months Ended (a) March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018 Revenues $ 63,124 $ 63,569 $ 66,075 $ 69,445 Net loss (4,160 ) (2,270 ) (2,597 ) (6,671 ) Net loss attributable to noncontrolling interests 11,579 9,935 11,822 13,801 Net income attributable to Acadia 7,419 7,665 9,225 7,130 Earnings per share attributable to Acadia: Basic $ 0.09 $ 0.09 $ 0.11 $ 0.09 Diluted 0.09 0.09 0.11 0.09 Weighted average number of shares: Basic 83,434 81,756 81,566 81,591 Diluted 83,438 81,756 81,566 81,591 Cash dividends declared per Common Share $ 0.27 $ 0.27 $ 0.27 $ 0.28 (a) The three months ended September 30, 2018 includes an aggregate $5.1 million gain on the sales of two consolidated Fund IV properties (), of which $3.9 million was attributable to noncontrolling interests. Three Months Ended (a, b, c, d) March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 Revenues $ 61,999 $ 59,504 $ 62,678 $ 66,081 Net income 19,971 6,108 13,285 24,944 Net (income) loss attributable to noncontrolling interests (4,340 ) 5,952 (418 ) (4,032 ) Net income attributable to Acadia 15,631 12,060 12,867 20,912 Earnings per share attributable to Acadia: Basic Diluted $ 0.18 $ 0.14 $ 0.15 $ 0.25 0.18 0.14 0.15 0.25 Weighted average number of shares: Basic 83,635 83,662 83,700 83,733 Diluted 83,646 83,662 83,700 83,733 Cash dividends declared per Common Share $ 0.26 $ 0.26 $ 0.26 $ 0.27 (a) The three months ended March 31, 2017 includes the Company’s $2.7 million proportionate share of aggregate gains of $14.5 million on the sales of two unconsolidated properties (). (b) The three months ended June 30, 2017 includes the Company’s $0.8 million proportionate share of a $3.3 million gain on sale of an unconsolidated property ( Note 4 (c) The three months ended September 30, 2017 includes an aggregate $13.0 million gain on the sales of two consolidated properties ( Note 2 Note 8 (d) The three months ended December 31, 2017 includes a $5.6 million gain on change in control of interests ( Note 4 Note 2 Note 8

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Capital Called Effective January 9, 2019, Fund V called capital of $33.2 million of which the Company’s share was $6.7 million. Financing and Hedging Transactions On January 4, 2019, the Company entered into $100.0 million notional amounts of 10-year interest rate swaps at a fixed rate of approximately 2.6%. On January 11, 2019, Fund V obtained a mortgage for its Elk Grove Commons property in the amount of $41.5 million, and also entered into a swap to fix the rate. Acquisition and Disposition On January 23, 2019, Fund III sold its 3104 M Street property for $10.5 million to an unconsolidated venture in which the Company holds a 20% interest, referred to as the Renaissance Portfolio (). In addition, the Renaissance Portfolio venture assumed the related Fund III mortgage of $4.7 million.

SCHEDULE II - VALUATION AND QUA

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2018
Valuation And Qualifying Accounts [Abstract]
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS	Balance at Beginning of Year Charged to Expenses Adjustments to Valuation Accounts Deductions Balance at End of Year Year Ended December 31, 2018: Allowance for deferred tax asset $ 1,530 $ — $ — $ (1,530 ) $ — Allowance for uncollectible accounts 5,920 2,532 (531 ) — 7,921 Allowance for notes receivable — — — — — Year Ended December 31, 2017: Allowance for deferred tax asset $ 859 $ — $ 671 $ — $ 1,530 Allowance for uncollectible accounts 5,720 200 — — 5,920 Allowance for notes receivable — — — — — Year Ended December 31, 2016: Allowance for deferred tax asset $ — $ — $ 859 $ — $ 859 Allowance for uncollectible accounts 7,451 — — (1,731 ) 5,720 Allowance for notes receivable — — — — —

SCHEDULE III - REAL ESTATE AND

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION	12 Months Ended
	Dec. 31, 2018
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	ACADIA REALTY TRUST December 31, 2018 Initial Cost to Company Amount at Which Carried at December 31, 2018 Description and Location Encumbrances Land Buildings & Improvements Increase (Decrease) in Net Investments Land Buildings & Improvements Total Accumulated Depreciation Date of Acquisition (a) Construction (c) Life on which Depreciation in Latest Statement of Income is Compared Core Portfolio: Crescent Plaza Brockton, MA $ — $ 1,147 $ 7,425 $ 3,222 $ 1,147 $ 10,647 $ 11,794 $ 8,112 1993 (a) 40 years New Loudon Center Latham, NY — 505 4,161 13,965 505 18,126 18,631 14,890 1993 (a) 40 years Mark Plaza Edwardsville, PA — — 3,396 — — 3,396 3,396 2,981 1993 (c) 40 years Plaza 422 Lebanon, PA — 190 3,004 2,809 190 5,813 6,003 5,227 1993 (c) 40 years Route 6 Mall Honesdale, PA — 1,664 — 12,490 1,664 12,490 14,154 9,813 1994 (c) 40 years Abington Towne Center Abington, PA — 799 3,197 2,876 799 6,073 6,872 4,016 1998 (a) 40 years Bloomfield Town Square Bloomfield Hills, MI — 3,207 13,774 25,803 3,207 39,577 42,784 23,366 1998 (a) 40 years Elmwood Park Shopping Center Elmwood Park, NJ — 3,248 12,992 15,738 3,798 28,180 31,978 19,867 1998 (a) 40 years Merrillville Plaza Hobart, IN — 4,288 17,152 5,726 4,288 22,878 27,166 13,173 1998 (a) 40 years Marketplace of Absecon Absecon, NJ — 2,573 10,294 4,920 2,577 15,210 17,787 8,603 1998 (a) 40 years 239 Greenwich Avenue Greenwich, CT 27,000 1,817 15,846 1,086 1,817 16,932 18,749 8,285 1998 (a) 40 years Hobson West Plaza Naperville, IL — 1,793 7,172 4,069 1,793 11,241 13,034 5,431 1998 (a) 40 years Village Commons Shopping Center Smithtown, NY — 3,229 12,917 4,597 3,229 17,514 20,743 9,918 1998 (a) 40 years Town Line Plaza Rocky Hill, CT — 878 3,510 7,736 907 11,217 12,124 9,206 1998 (a) 40 years Branch Shopping Center Smithtown, NY — 3,156 12,545 16,119 3,401 28,419 31,820 12,757 1998 (a) 40 years Methuen Shopping Center Methuen, MA — 956 3,826 1,484 961 5,305 6,266 2,683 1998 (a) 40 years The Gateway Shopping Center South Burlington, VT — 1,273 5,091 12,413 1,273 17,504 18,777 10,169 1999 (a) 40 years Mad River Station Dayton, OH — 2,350 9,404 2,173 2,350 11,577 13,927 5,955 1999 (a) 40 years Pacesetter Park Shopping Center Ramapo, NY — 1,475 5,899 3,743 1,475 9,642 11,117 5,439 1999 (a) 40 years Brandywine Holdings Wilmington, DE 26,250 5,063 15,252 2,495 5,201 17,609 22,810 7,199 2003 (a) 40 years Bartow Avenue Bronx, NY — 1,691 5,803 1,190 1,691 6,993 8,684 3,250 2005 (c) 40 years Amboy Road Staten Island, NY — — 11,909 2,632 — 14,541 14,541 7,319 2005 (a) 40 years Chestnut Hill Philadelphia, PA — 8,289 5,691 4,509 8,289 10,200 18,489 4,447 2006 (a) 40 years 2914 Third Avenue Bronx, NY — 11,108 8,038 4,788 11,855 12,079 23,934 3,085 2006 (a) 40 years West Shore Expressway Staten Island, NY — 3,380 13,499 — 3,380 13,499 16,879 4,496 2007 (a) 40 years West 54th Street Manhattan, NY — 16,699 18,704 1,234 16,699 19,938 36,637 6,184 2007 (a) 40 years 5-7 East 17th Street Manhattan, NY — 3,048 7,281 6,133 3,048 13,414 16,462 2,855 2008 (a) 40 years 651-671 W Diversey Chicago, IL — 8,576 17,256 8 8,576 17,264 25,840 3,273 2011 (a) 40 years 15 Mercer Street New York, NY — 1,887 2,483 — 1,887 2,483 4,370 466 2011 (a) 40 years 4401 White Plains Bronx, NY — 1,581 5,054 — 1,581 5,054 6,635 927 2011 (a) 40 years Chicago Street Retail Portfolio Chicago, IL — 27,588 52,274 14,804 27,626 67,040 94,666 13,063 2012 (a) 40 years 1520 Milwaukee Avenue Chicago, IL — 2,110 1,306 290 2,110 1,596 3,706 243 2012 (a) 40 years 330-340 River Street Cambridge, MA 11,396 8,404 14,235 — 8,404 14,235 22,639 2,547 2012 (a) 40 years Rhode Island Place Shopping Center Washington, D.C. — 7,458 15,968 1,924 7,458 17,892 25,350 3,314 2012 (a) 40 years 930 Rush Street Chicago, IL — 4,933 14,587 — 4,933 14,587 19,520 2,461 2012 (a) 40 years 28 Jericho Turnpike Westbury, NY 13,918 6,220 24,416 — 6,220 24,416 30,636 4,215 2012 (a) 40 years 181 Main Street Westport, CT — 1,908 12,158 407 1,908 12,565 14,473 1,943 2012 (a) 40 years 83 Spring Street Manhattan, NY — 1,754 9,200 — 1,754 9,200 10,954 1,495 2012 (a) 40 years 60 Orange Street Bloomfield, NJ 7,266 3,609 10,790 — 3,609 10,790 14,399 1,859 2012 (a) 40 years 179-53 & 1801-03 Connecticut Avenue Washington, D.C. — 11,690 10,135 1,014 11,690 11,149 22,839 1,863 2012 (a) 40 years 639 West Diversey Chicago, IL — 4,429 6,102 916 4,429 7,018 11,447 1,283 2012 (a) 40 years 664 North Michigan Chicago, IL — 15,240 65,331 — 15,240 65,331 80,571 9,601 2013 (a) 40 years 8-12 E. Walton Chicago, IL — 5,398 15,601 977 5,398 16,578 21,976 2,394 2013 (a) 40 years 3200-3204 M Street Washington, DC — 6,899 4,249 168 6,899 4,417 11,316 693 2013 (a) 40 years 868 Broadway Manhattan, NY — 3,519 9,247 5 3,519 9,252 12,771 1,174 2013 (a) 40 years 313-315 Bowery Manhattan, NY — — 5,516 — — 5,516 5,516 1,116 2013 (a) 40 years 120 West Broadway Manhattan, NY — — 32,819 1,116 — 33,935 33,935 2,798 2013 (a) 40 years 11 E. Walton Chicago, IL — 16,744 28,346 192 16,744 28,538 45,282 3,648 2014 (a) 40 years 61 Main Street Westport, CT — 4,578 2,645 706 4,578 3,351 7,929 371 2014 (a) 40 years 865 W. North Avenue Chicago, IL — 1,893 11,594 23 1,893 11,617 13,510 1,396 2014 (a) 40 years 152-154 Spring St. Manhattan, NY — 8,544 27,001 — 8,544 27,001 35,545 3,184 2014 (a) 40 years 2520 Flatbush Ave Brooklyn, NY — 6,613 10,419 248 6,613 10,667 17,280 1,299 2014 (a) 40 years 252-256 Greenwich Avenue Greenwich, CT — 10,175 12,641 544 10,175 13,185 23,360 1,647 2014 (a) 40 years Bedford Green Bedford Hills, NY — 12,425 32,730 4,102 13,763 35,494 49,257 4,245 2014 (a) 40 years 131-135 Prince Street Manhattan, NY — — 57,536 242 — 57,778 57,778 11,605 2014 (a) 40 years Shops at Grand Ave Queens, NY — 20,264 33,131 1,965 20,264 35,096 55,360 3,651 2014 (a) 40 years 201 Needham Street Newton, MA — 4,550 4,459 105 4,550 4,564 9,114 536 2014 (a) 40 years City Center San Francisco, CA — 36,063 109,098 16,814 36,063 125,912 161,975 10,585 2015 (a) 40 years 163 Highland Avenue Needham, MA 8,852 12,679 11,213 — 12,679 11,213 23,892 1,198 2015 (a) 40 years Roosevelt Galleria Chicago, IL — 4,838 14,574 13 4,838 14,587 19,425 1,223 2015 (a) 40 years Route 202 Shopping Center Wilmington, DE — — 6,346 501 — 6,847 6,847 673 2015 (a) 40 years 991 Madison Avenue New York, NY — — 76,965 1,506 — 78,471 78,471 4,413 2016 (a) 40 years 165 Newbury Street Boston, MA — 1,918 3,980 — 1,918 3,980 5,898 265 2016 (a) 40 years Concord & Milwaukee Chicago, IL 2,728 2,739 2,746 — 2,739 2,746 5,485 175 2016 (a) 40 years State & Washington Chicago, IL 24,439 3,907 70,943 20 3,907 70,963 74,870 4,138 2016 (a) 40 years 151 N. State Street Chicago, IL 13,882 1,941 25,529 — 1,941 25,529 27,470 1,542 2016 (a) 40 years North & Kingsbury Chicago, IL 12,555 18,731 16,292 52 18,731 16,344 35,075 989 2016 (a) 40 years Sullivan Center Chicago, IL 50,000 13,443 137,327 419 13,443 137,746 151,189 8,052 2016 (a) 40 years California & Armitage Chicago, IL 2,566 6,770 2,292 2 6,770 2,294 9,064 148 2016 (a) 40 years 555 9th Street San Francisco, CA 60,000 75,591 73,268 1 75,591 73,269 148,860 4,000 2016 (a) 40 years Market Square Wilmington, DE — 8,100 31,221 228 8,100 31,449 39,549 937 2017 (a) 40 years Undeveloped Land — 100 — — 100 — 100 — Fund II: City Point Brooklyn, NY 224,587 — 100,316 468,337 — 568,653 568,653 29,640 2007 (c) 40 years Fund III: 654 Broadway Manhattan, NY — 9,040 3,654 3,497 9,040 7,151 16,191 1,209 2011 (a) 40 years 640 Broadway Manhattan, NY 49,470 12,503 19,960 14,304 12,503 34,264 46,767 5,798 2012 (a) 40 years Cortlandt Crossing Mohegan Lake, NY 26,000 11,000 — 64,870 12,750 63,120 75,870 415 2012 (c) 40 years 3104 M Street Washington, DC 4,531 750 2,115 5,162 750 7,277 8,027 566 2013 (c) 40 years 3780-3858 Nostrand Avenue Brooklyn, NY 10,097 6,229 11,216 6,365 6,229 17,581 23,810 2,857 2013 (a) 40 years Fund IV: 210 Bowery Manhattan, NY — 1,875 5,625 6,021 1,875 11,646 13,521 26 2012 (c) 40 years Paramus Plaza Paramus, NJ 17,627 11,052 7,037 11,934 11,052 18,971 30,023 2,836 2013 (a) 40 years 938 W. North Avenue Chicago, IL 14,100 2,314 17,067 5,362 2,314 22,429 24,743 2,473 2013 (a) 40 years 27 E. 61st Street Manhattan, NY — 4,813 14,438 7,100 4,813 21,538 26,351 666 2014 (c) 40 years 17 E. 71st Street Manhattan, NY 18,906 7,391 20,176 280 7,391 20,456 27,847 2,211 2014 (a) 40 years 1035 Third Avenue Manhattan, NY 38,434 12,759 37,431 5,386 14,099 41,477 55,576 4,222 2015 (a) 40 years 801 Madison Avenue Manhattan, NY — 4,178 28,470 5,608 4,178 34,078 38,256 1,054 2015 (c) 40 years 2208-2216 Fillmore Street San Francisco, CA 5,606 3,027 6,376 32 3,027 6,408 9,435 511 2015 (a) 40 years 146 Geary Street San Francisco, CA 27,700 9,500 28,500 489 9,500 28,989 38,489 2,257 2015 (a) 40 years 2207 Fillmore Street San Francisco, CA 1,120 1,498 1,735 118 1,498 1,853 3,351 143 2015 (a) 40 years 1964 Union Street San Francisco, CA 1,463 563 1,688 1,867 563 3,555 4,118 121 2016 (c) 40 years Restaurants at Fort Point Boston, MA 6,201 1,041 10,905 — 1,041 10,905 11,946 818 2016 (a) 40 years Wakeforest Crossing Wake Forest, NC 23,706 7,570 24,829 220 7,570 25,049 32,619 1,799 2016 (a) 40 years Airport Mall Bangor, ME 5,476 2,294 7,067 458 2,294 7,525 9,819 526 2016 (a) 40 years Colonie Plaza Albany, NY 11,890 2,852 9,619 271 2,852 9,890 12,742 632 2016 (a) 40 years Dauphin Plaza Harrisburg, PA 10,021 5,290 9,464 2,235 5,290 11,699 16,989 793 2016 (a) 40 years JFK Plaza Waterville, ME 4,381 751 5,991 9 751 6,000 6,751 412 2016 (a) 40 years Mayfair Shopping Center Philadelphia, PA — 6,178 9,266 741 6,178 10,007 16,185 602 2016 (a) 40 years Shaw's Plaza Waterville, ME 7,840 828 11,814 56 828 11,870 12,698 721 2016 (a) 40 years Wells Plaza Wells, ME 3,286 1,892 2,585 236 1,892 2,821 4,713 245 2016 (a) 40 years 717 N. Michigan Chicago, IL 18,972 20,674 10,093 1 20,674 10,094 30,768 523 2016 (c) 40 years Shaw's Plaza North Windham, ME 5,848 1,876 6,696 1 1,876 6,697 8,573 281 2017 (a) 40 years Lincoln Place Fairview Heights, IL 23,100 7,149 22,201 920 7,149 23,121 30,270 1,218 2017 (a) 40 years Broughton Street Portfolio (BSP I) Savannah, GA 19,773 9,930 21,905 — 9,930 21,905 31,835 136 2018 (a) 40 years Fund V: Plaza Santa Fe Santa Fe, NM 22,893 — 28,214 69 — 28,283 28,283 1,228 2017 (a) 40 years Hickory Ridge Hickory, NC 28,613 7,852 29,998 75 7,852 30,073 37,925 1,166 2017 (a) 40 years New Towne Plaza Canton, MI 16,900 5,040 17,391 106 5,040 17,497 22,537 713 2017 (a) 40 years Fairlane Green Allen Park, MI 40,300 18,121 37,143 247 18,121 37,390 55,511 1,026 2017 (a) 40 years Trussville Promenade Birmingham, AL 29,370 7,587 34,285 — 7,587 34,285 41,872 778 2018 (a) 40 years Elk Grove Commons Elk Grove, CA — 6,204 48,008 28 6,204 48,036 54,240 525 2018 (a) 40 years Hiram Pavilion I & II Hiram, GA — 13,029 25,446 27 13,029 25,473 38,502 137 2018 (a) 40 years Real Estate Under Development 47,645 65,297 31,473 23,527 65,297 55,000 120,297 — Debt of Assets Held for Sale — — — — — — — — Unamortized Loan Costs (10,173 ) — — — — — — — Unamortized Premium 753 — — — — — — — Total $ 1,017,288 $ 769,582 $ 2,079,002 $ 849,221 $ 775,766 $ 2,922,039 $ 3,697,805 $ 416,657 Notes: 1. Depreciation on buildings and improvements reflected in the consolidated statements of income is calculated over the estimated useful life of the assets as follows: Buildings at 40 years and improvements at the shorter of lease term or useful life. 2. The aggregate gross cost of property included above for Federal income tax purposes was approximately $3.4 billion as of December 31, 2018. The following table reconciles the activity for real estate properties from January 1, 2016 to December 31, 2018 (in thousands): Year Ended December 31, 2018 2017 2016 Balance at beginning of year $ 3,466,482 $ 3,382,000 $ 2,736,283 Other improvements 100,077 55,763 152,129 Property acquisitions 134,559 179,292 761,400 Property dispositions or held for sale assets (34,666 ) (189,895 ) (134,332 ) Other (483 ) — (9,844 ) Deconsolidation of previously consolidated investments — — (123,636 ) Consolidation of previously unconsolidated investments 31,836 39,322 — Balance at end of year $ 3,697,805 $ 3,466,482 $ 3,382,000 The following table reconciles accumulated depreciation from January 1, 2016 to December 31, 2018 (in thousands): Year Ended December 31, 2018 2017 2016 Balance at beginning of year $ 339,862 $ 287,066 $ 298,703 Depreciation related to real estate 78,453 73,268 49,269 Property dispositions (1,658 ) (20,472 ) (27,829 ) Deconsolidation of previously consolidated investments — — (33,077 ) Balance at end of year $ 416,657 $ 339,862 $ 287,066

SCHEDULE IV - MORTGAGE LOANS ON

SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE	12 Months Ended
	Dec. 31, 2018
Mortgage Loans On Real Estate [Abstract]
SCHEDULE IV-MORTGAGE LOANS ON REAL ESTATE	Description Effective Interest Rate Final Maturity Date Face Amount of Notes Receivable Net Carrying Amount of Notes Receivable as of December 31, 2018 First Mortgage Loan 6.0% 4/30/2020 $ 15,000 $ 17,802 First Mortgage Loan 8.1% 4/30/2019 153,400 38,673 Zero Coupon Loan 2.5% 5/31/2020 29,793 32,582 Mezzanine Loan 18.0% 7/1/2020 3,007 5,306 Preferred Equity 15.3% 2/3/2021 14,000 15,250 Total $ 215,200 $ 109,613 The Company monitors the credit quality of its notes receivable on an ongoing basis and considers indicators of credit quality such as loan payment activity, the estimated fair value of the underlying collateral, the seniority of the Company's loan in relation to other debt secured by the collateral, the personal guarantees of the borrower and the prospects of the borrower. The following table reconciles the activity for loans on real estate from January 1, 2016 to December 31, 2018 (in thousands): Reconciliation of Loans on Real Estate Year Ended December 31, 2018 2017 2016 Balance at beginning of year $ 153,829 $ 276,163 $ 147,188 Additions 3,805 11,371 171,794 Repayments (26,000 ) (32,000 ) (42,819 ) Conversion to real estate through receipt of deed (22,021 ) (101,705 ) — Balance at end of year $ 109,613 $ 153,829 $ 276,163

Organization, Basis of Presen_2

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Segments	Segments At December 31, 2018, the Company had three reportable operating segments: Core Portfolio, Funds and Structured Financing. The Company’s chief operating decision maker may review operational and financial data on a property basis and does not differentiate properties on a geographical basis for purposes of allocating resources or capital.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the consolidated accounts of the Company and its investments in partnerships and limited liability companies in which the Company has control in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810 “Consolidation” (“ASC Topic 810”). The ownership interests of other investors in these entities are recorded as noncontrolling interests. All significant intercompany balances and transactions have been eliminated in consolidation. Investments in entities for which the Company has the ability to exercise significant influence over, but does not have financial or operating control, are accounted for using the equity method of accounting. Accordingly, the Company’s share of the earnings (or losses) of these entities are included in consolidated net income.
Use of Estimates	Use of Estimates GAAP requires the Company’s management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The most significant assumptions and estimates relate to the valuation of real estate, depreciable lives, revenue recognition and the collectability of notes receivable and rents receivable. Application of these estimates and assumptions requires the exercise of judgment as to future uncertainties and, as a result, actual results could differ from these estimates.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified for consistency with the current year presentation in the statement of cash flows. These reclassifications had no effect on the reported results of operations.
Real Estate	Real Estate Land, buildings, and personal property are carried at cost less accumulated depreciation. Improvements and significant renovations that extend the useful life of the properties are capitalized, while replacements, maintenance, and repairs that do not improve or extend the lives of the respective assets are expensed as incurred. Real estate under development includes costs for significant property expansion and development. Depreciation is computed on the straight-line basis over estimated useful lives of the assets as follows: Buildings and improvements Useful lives of Furniture and fixtures Useful lives, ranging from Tenant improvements Shorter of economic life or lease terms Purchase Accounting – Upon acquisitions of real estate, the Company assesses the fair value of acquired assets and assumed liabilities (including land, buildings and improvements, and identified intangibles such as above- and below-market leases and acquired in-place leases and customer relationships) and acquired liabilities in accordance with and “ and allocates the acquisition price based on these assessments. When acquisitions of properties do not meet the criteria for business combinations, no goodwill is recorded and acquisition costs are capitalized The Company assesses fair value of its tangible assets acquired and assumed liabilities based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information at the measurement period. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. In determining the value of above- and below-market leases, the Company estimates the present value difference between contractual rent obligations and estimated market rate of leases at the time of the transaction. To the extent there were fixed-rate options at below-market rental rates, the Company included these along with the current term below-market rent in arriving at the fair value of the acquired leases. The discounted difference between contract and market rents is being amortized to rental income over the remaining applicable lease term, inclusive of any option periods. In determining the value of acquired in-place leases and customer relationships, the Company considers market conditions at the time of the transaction and values the costs to execute similar leases during the expected lease-up period from vacancy to existing occupancy, including carrying costs. The value assigned to in-place leases and tenant relationships is amortized over the estimated remaining term of the leases. If a lease were to be terminated prior to its scheduled expiration, all unamortized costs relating to that lease would be written off. The Company estimates the value of any assumption of mortgage debt based on market conditions at the time of acquisitions including prevailing interest rates, terms and ability to obtain financing for a similar asset. Mortgage debt discounts or premiums are amortized into interest expense over the remaining term of the related debt instrument. Real Estate Under Development – The Company capitalizes certain costs related to the development of real estate. Interest and real estate taxes incurred during the period of the construction, expansion or development of real estate are capitalized and depreciated over the estimated useful life of the building. The Company will cease the capitalization of these costs when construction activities are substantially completed and the property is available for occupancy by tenants, but no later than one year from the completion of major construction activity at which time the project is placed in service and depreciation commences. If the Company suspends substantially all activities related to development of a qualifying asset, the Company will cease capitalization of interest and taxes until activities are resumed. Real Estate Impairment – The Company reviews its real estate and real estate under development for impairment when there is an event or a change in circumstances that indicates that the carrying amount may not be recoverable. In cases where the Company does not expect to recover its carrying costs on properties held for use, the Company reduces its carrying costs to fair value. The determination of anticipated undiscounted cash flows is inherently subjective, requiring significant estimates made by management, and considers the most likely expected course of action at the balance sheet date based on current plans, intended holding periods and available market information. If the Company is evaluating the potential sale of an asset, the undiscounted future cash flows analysis is probability-weighted based upon management’s best estimate of the likelihood of the alternative courses of action as of the balance sheet date. Such cash flow projections consider factors such as expected future operating income, trends and prospects, as well as the effects of demand, competition and other factors. If an impairment is indicated, an impairment loss is recognized based on the excess of the carrying amount of the asset over its fair value. See Note 8 for information about impairment charges incurred during the periods presented.
Dispositions of Real Estate	Dispositions of Real Estate – The Company recognizes property sales in accordance with “ Sales of real estate include the sale of land, operating properties and investments in real estate joint ventures. Beginning January 1, 2018, gains on sale of investment properties are recognized, and the related real estate derecognized, when the Company has satisfied its performance obligations by transferring control of the property. Typically, the timing of payment and satisfaction of performance obligations occur simultaneously on the disposition date upon transfer of the property’s ownership. Prior to January 1, 2018, gains from dispositions were recognized under the full accrual or partial sales method provided that various criteria relating to terms of sales and subsequent involvement by the Company with the asset sold are met.
Real Estate Held for Sale	Real Estate Held for Sale – The Company generally considers assets to be held for sale when it has entered into a contract to sell the property, all material due diligence requirements have been satisfied, and management believes it is probable that the disposition will occur within one year. Assets that are classified as held for sale are recorded at the lower of their carrying amount or fair value, less cost to sell.
Notes Receivable	Notes Receivable Notes receivable include certain loans that are held for investment and are collateralized by real estate-related investments and may be subordinate to other senior loans. Notes receivable are recorded at stated principal amounts or at initial investment less accretive yield for loans purchased at a discount, which is accreted over the life of the note. The Company defers loan origination and commitment fees, net of origination costs, and amortizes them over the term of the related loan. The Company evaluates the collectability of both principal and interest based upon an assessment of the underlying collateral value to determine whether it is impaired. A reserve is recorded when, based upon current information and events, it is probable that the Company will be unable to collect all amounts due according to the existing contractual terms. The amount of the reserve is calculated by comparing the recorded investment to the value of the underlying collateral. As the underlying collateral for a majority of the notes receivable is real estate-related investments, the same valuation techniques are used to value the collateral as those used to determine the fair value of real estate investments for impairment purposes. Given the small number of notes outstanding, the Company does not provide for an additional reserve based on the grouping of loans, as the Company believes the characteristics of its notes are not sufficiently similar to allow an evaluation of these notes as a group for a possible loan loss allowance. As such, all of the Company’s notes are evaluated individually for this purpose. Interest income on performing notes is accrued as earned. A note is placed on non-accrual status when, based upon current information and events, it is probable that the Company will not be able to collect all amounts due according to the existing contractual terms. Recognition of interest income on an accrual basis on non-performing notes is resumed when it is probable that the Company will be able to collect amounts due according to the contractual terms.
Investments in and Advances to Unconsolidated Joint Ventures	Investments in and Advances to Unconsolidated Joint Ventures Some of the Company’s joint ventures obtain non-recourse third-party financing on their property investments, contractually limiting the Company’s exposure to losses. The Company recognizes income for distributions in excess of its investment where there is no recourse to the Company and no intention or obligation to contribute additional capital. For investments in which there is recourse to the Company or an obligation or intention to contribute additional capital exists, distributions in excess of the investment are recorded as a liability. When characterizing distributions from equity investees within the Company's consolidated statements of cash flows, all distributions received are first applied as returns on investment to the extent there are cumulative earnings related to the respective investment and are classified as cash inflows from operating activities. If cumulative distributions are in excess of cumulative earnings, distributions are considered return of investment. In such cases, the distribution is classified as cash inflows from investing activities. To the extent that the Company’s carrying basis in an unconsolidated affiliate is different from the basis reflected at the joint venture level, the basis difference is amortized over the life of the related assets and included in the Company’s share of equity in net income (loss) of investments in unconsolidated affiliates the joint venture. The Company periodically reviews its investments in unconsolidated joint ventures for other-than-temporary losses in investment value. Any decline that is not expected to be recovered based on the underlying assets of the investment, is considered other than temporary and an impairment charge is recorded as a reduction in the carrying value of the investment. During the periods presented there were no impairment charges related to the Company’s investments in unconsolidated joint ventures.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed the limits insured by the Federal Deposit Insurance Corporation.
Restricted Cash	Restricted Cash Restricted cash consists principally of cash held for real estate taxes, construction costs, property maintenance, insurance, minimum occupancy and property operating income requirements at specific properties as required by certain loan agreements.
Deferred Costs	Deferred Costs Fees and costs paid in the successful negotiation of leases are deferred and amortized on a straight-line basis over the terms of the respective leases. Fees and costs incurred in connection with obtaining financing are deferred and amortized as a component of interest expense over the term of the related debt obligation on a straight-line basis, which approximates the effective interest method. The Company capitalizes salaries, commissions and benefits related to time spent by leasing and legal department personnel involved in originating leases. Effective January 1, 2019, these internal leasing costs will no longer be capitalized as discussed further below under ASU 2016-02.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Company measures derivative instruments at fair value and records them as assets or liabilities, depending on its rights or obligations under the applicable derivative contract. Derivatives that are not designated as hedges must be adjusted to fair value through earnings. For a derivative designated and that qualified as a cash flow hedge, the effective portion of the change in fair value of the derivative is recognized in Other comprehensive (loss) income until the hedged item is recognized in earnings. The ineffective portion of a derivative’s change in fair value is immediately recognized in earnings. Although the Company's derivative contracts are subject to master netting arrangements, which serve as credit mitigants to both the Company and its counterparties under certain situations, the Company does not net its derivative fair values or any existing rights or obligations to cash collateral on the consolidated balance sheets. The Company does not use derivatives for trading or speculative purposes. For the periods presented, all of the Company's derivatives qualified and were designated as cash flow hedges, and none of its derivatives were deemed ineffective.
NonControlling Interests	Noncontrolling Interests Noncontrolling interests represent the portion of equity that the Company does not own in those entities it consolidates. The Company identifies its noncontrolling interests separately within the equity section on the Company’s consolidated balance sheets. The amounts of consolidated net earnings attributable to the Company and to the noncontrolling interests are presented separately on the Company’s consolidated statements of income. Noncontrolling interests also include amounts related to common and preferred OP Units issued to unrelated third parties in connection with certain property acquisitions. In addition, the Company periodically issues common OP Units to certain employees of the Company under its share-based incentive program. Unit holders generally have the right to redeem their units for shares of the Company's common stock subject to blackout and other limitations. Common and restricted OP Units are included in the caption Noncontrolling interest within the equity section on the Company’s consolidated balance sheets.
Revenue Recognition and Accounts Receivable	Revenue Recognition and Accounts Receivable Minimum rents from tenants are recognized using the straight-line method over the non-cancelable lease term of the respective leases. Lease termination fees are recognized upon the effective termination of a tenant’s lease when the Company has no further obligations under the lease. As of December 31, 2018 and 2017, unbilled rents receivable relating to the straight-lining of rents of $47.2 million and $37.4 million, respectively, are included in Rents Receivable, net on the accompanying consolidated balance sheets. Certain of these leases also provide for percentage rents based upon the level of sales achieved by the tenant. Percentage rent is recognized in the period when the tenants’ sales breakpoint is met. In addition, leases typically provide for the reimbursement to the Company of real estate taxes, insurance and other property operating expenses. These reimbursements are recognized as revenue in the period the related expenses are incurred. The Company makes estimates of the uncollectability of its accounts receivable related to tenant revenues. An allowance for doubtful accounts has been provided against certain tenant accounts receivable that are estimated to be uncollectible. Once the amount is ultimately deemed to be uncollectible, it is written off. Rents receivable at December 31, 2018 and 2017 are shown net of an allowance for doubtful accounts of $7.9 million and $5.9 million, respectively.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense for all equity-classified stock-based compensation awards is based on the grant date fair value estimated in accordance with current accounting guidance for share-based payments. The Company recognizes these compensation costs for only those shares or units expected to vest on a straight-line or graded-vesting basis, as appropriate, over the requisite service period of the award. The Company includes stock-based compensation within the Additional paid-in capital caption of equity.
Income Taxes	Income Taxes The Company has made an election to be taxed, and believes it qualifies, as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). To maintain REIT status for Federal income tax purposes, the Company is generally required to distribute at least 90% of its REIT taxable income to its shareholders as well as comply with certain other income, asset and organizational requirements as defined in the Code. Accordingly, the Company is generally not subject to Federal corporate income tax to the extent that it distributes 100% of its REIT taxable income each year. In connection with the REIT Modernization Act, the Company is permitted to participate in certain activities and still maintain its qualification as a REIT, so long as these activities are conducted in entities that elect to be treated as taxable subsidiaries under the Code. As such, the Company is subject to Federal and state income taxes on the income from these activities. The Tax Cuts and Jobs Act was enacted in December 2017 and is generally effective for tax years beginning in 2018. This new legislation is not expected to have a material adverse effect on the Company’s business and allows non-corporate shareholders to deduct a portion of the Company’s dividends. Although it may qualify for REIT status for Federal income tax purposes, the Company is subject to state income or franchise taxes in certain states in which some of its properties are located. In addition, taxable income from non-REIT activities managed through the Company’s taxable REIT subsidiaries (“TRS”) is fully subject to Federal, state and local income taxes. The Company accounts for TRS income taxes under the liability method as required by ASC Topic 740, “Income Taxes.” Under the liability method, deferred income taxes are recognized for the temporary differences between the GAAP basis and tax basis of the TRS income, assets and liabilities. The Company records net deferred tax assets to the extent it believes it is more likely than not that these assets will be realized and would record a valuation allowance to reduce deferred tax assets when it has determined that an uncertainty exists regarding their realization, which would increase the provision for income taxes. In making such determination, the Company considers all available positive and negative evidence, including forecasts of future taxable income, the reversal of other existing temporary differences, available net operating loss carry-forwards, tax planning strategies and recent results of operations. Several of these considerations require assumptions and significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates that the Company is utilizing to manage its business. To the extent facts and circumstances change in the future, adjustments to the valuation allowances may be required.
Recently Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements Recently adopted accounting pronouncements include those adopted during the year ended December 31, 2018. In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows—Classification of Certain Cash Receipts and Cash Payments. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash In January 2017, the FASB issued ASU No. 2017-01, Business Combinations—Clarifying the Definition of a Business. In January 2017, the FASB issued ASU No. 2017-03, Accounting Changes and Error Corrections (Topic 250) and Investments— Equity Method and Joint Ventures (Topic 323). In February 2017, the FASB issued ASU No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting, In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities In March 2018, the FASB issued ASU No. 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118, Recently Issued Accounting Pronouncements Lease Accounting In February 2016, the FASB issued ASU No. 2016-02 , Leases. Revenue from Contracts with Customers, initial direct current GAAP (Topic 840, Leases ). This will result in a change to the accounting for our ASU 2016-02 initially provided for one retrospective transition method; however, a second transition method was later added with ASU 2018-11 as described below. To ease the transition, the new lease accounting guidance permits companies to utilize certain practical expedients in their implementation of the new standard: • A package of three practical expedients that must be elected together for all leases and includes: (i) not reassessing expired or existing contracts as to whether they are or contain leases; (ii) not reassessing lease classification of existing leases and (iii) not reassessing the amount of capitalized initial direct costs for existing leases; • ASU 2016-02 also includes a practical expedient to use hindsight in determining the lease term or assessing purchase options for existing leases and in assessing impairment of right of use assets; • ASU 2018-01, Land Easements Practical Expedient for Transition to Topic 842 • A new practical expedient under ASU 2018-11, described below. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases Leases (Topic 842) In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements Leases In December 2018, the FASB issued ASU 2018-20 Leases (Topic 842), Narrow-Scope Improvements for Lessors The Company has adopted ASU No. 2016-02 (as amended by subsequent ASUs) effective January 1, 2019 utilizing the new transition method described in ASU 2018-11 and has availed itself of all the available practical expedients described above except it will not use hindsight in determining the lease term or assessing purchase options for existing leases and in assessing impairment of right of use assets. As lessor, the Company expects that post-adoption substantially all existing leases will have no change in the timing of revenue recognition until their expiration or termination. For common area maintenance income, currently reported within expense reimbursements, while this will be considered a nonlease component within the scope of Topic 606 for new leases, the Company has elected the lessor practical expedient to not separate maintenance from the associated lease for all existing and new leases and to account for the combined component as a single lease component. The Company has determined that the effect of electing this lessor practical expedient is that revenues related to leases will be reported on one line in the presentation within the statement of income. The timing of revenue recognition is expected to be the same for the majority of the Company’s new leases as compared to similar existing leases. After adoption, the Company will no longer capitalize a significant portion of internal leasing costs that were previously capitalized (the Company capitalized $1.4 million and $1.3 million of internal leasing costs during the years ended December 31, 2018 and 2017, respectively ). As a lessee, the Company is party to several equipment, ground, and office leases with future payment obligations aggregating approximately $203.1 million at December 31, 2018 Other Accounting Topics In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. Revenue from Contracts with Customers In July 2018, the FASB issued ASU No. 2018-09, Codification Improvements In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-15 Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In November 2018, the FASB issued ASU No. 2018-19 Codification Improvements to Topic 326, Financial Instruments – Credit Losses Financial Instruments – Credit Losses – Measure at Amortized Cost Leases

Organization, Basis of Presen_3

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Operating Partnership's Equity Interest	The following table summarizes the general terms and Operating Partnership’s equity interests in the Funds and Mervyns II (dollars in millions): Entity Formation Date Operating Partnership Share of Capital Capital Called as of December 31, 2018 Unfunded Commitment Equity Interest Held By Operating Partnership (a) Preferred Return Total Distributions as of December 31, 2018 (b) Fund II and Mervyns II (c) 6/2004 28.33 % $ 347.1 $ — 28.33 % 8 % $ 146.6 Fund III 5/2007 24.54 % 423.9 26.1 24.54 % 6 % 551.9 Fund IV 5/2012 23.12 % 420.8 109.2 23.12 % 6 % 147.4 Fund V 8/2016 20.10 % 85.1 434.9 20.10 % 6 % — (a) Amount represents the current economic ownership at December 31, 2018, which could differ from the stated legal ownership based upon the cumulative preferred returns of the respective fund. (b) Represents the total for the Funds, including the Operating Partnership and noncontrolling interests’ shares. (c) During April 2018, a distribution of $15.0 million was made to the Fund II investors, including $4.3 million to the Operating Partnership. This amount remains subject to re-contribution to Fund II until April 2021.

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2018
Acquisition And Disposition Of Properties And Discontinued Operations [Abstract]
Schedule of Consolidated Real Estate	The Company’s consolidated real estate is comprised of the following (in thousands): December 31, 2018 2017 Land $ 710,469 $ 658,835 Buildings and improvements 2,594,828 2,406,488 Tenant improvements 151,154 131,850 Construction in progress 44,092 18,642 Properties under capital lease 76,965 76,965 Total 3,577,508 3,292,780 Less: Accumulated depreciation (416,657 ) (339,862 ) Operating real estate, net 3,160,851 2,952,918 Real estate under development, at cost 120,297 173,702 Net investments in real estate $ 3,281,148 $ 3,126,620
Schedule of Business Acquisitions, by Acquisition	During the years ended December 31, 2018 and December 31, 2017, the Company acquired the following consolidated retail properties (dollars in thousands): Property and Location Percent Acquired Date of Acquisition Purchase Price 2018 Acquisitions and Conversions Core Bedford Green Land Parcel - Bedford Hills, NY 100% Mar 23, 2018 $ 1,337 Subtotal Core 1,337 Fund IV Broughton Street Partners I - Savannah, GA (Conversion) ( Note 4 100% Oct 11, 2018 36,104 Subtotal Fund IV 36,104 Fund V Trussville Promenade - Trussville, AL 100% Feb 21, 2018 45,259 Elk Grove Commons - Elk Grove, CA 100% Jul 18, 2018 59,320 Hiram Pavilion - Hiram, GA 100% Oct 23, 2018 44,443 Subtotal Fund V 149,022 Total 2018 Acquisitions and Conversions $ 186,463 2017 Acquisitions and Conversions Core Market Square Shopping Center - Wilmington, DE (Conversion) ( Note 4 100% Nov 16, 2017 $ 42,800 Subtotal Core 42,800 Fund IV Lincoln Place - Fairview Heights, IL 100% Mar 13, 2017 35,350 Shaw's Plaza - Windham, ME (Conversion) ( Note 3 ) 100% Jun 30, 2017 9,142 Subtotal Fund IV 44,492 Fund V Plaza Santa Fe - Santa Fe, NM 100% Jun 5, 2017 35,220 Hickory Ridge - Hickory, NC 100% Jul 27, 2017 44,020 New Towne Plaza - Canton, MI 100% Aug 4, 2017 26,000 Fairlane Green - Allen Park, MI 100% Dec 20, 2017 62,000 Subtotal Fund V 167,240 Total 2017 Acquisitions and Conversions $ 254,532
Schedule of Purchase Price Allocations	The following table summarizes the allocation of the purchase price of properties acquired during the years ended December 31, 2018 and December 31, 2017 (in thousands): Year Ended December 31, 2018 2017 Net Assets Acquired Land $ 38,086 $ 48,138 Buildings and improvements 129,586 173,576 Other assets — 84 Acquisition-related intangible assets ( Note 6 ) 26,693 44,269 Acquisition-related intangible liabilities ( Note 6 ) (7,902 ) (11,535 ) Net assets acquired $ 186,463 $ 254,532 Consideration Cash $ 147,985 $ 200,429 Conversion of note receivable — 41,010 Liabilities assumed 2,597 3,363 Existing interest in previously unconsolidated investment 35,881 4,159 Change in control of previously unconsolidated investment — 5,571 Total Consideration $ 186,463 $ 254,532
Schedule of Property Dispositions	During the years ended December 31, 2018 and December 31, 2017, the Company disposed of the following consolidated properties (in thousands): Property and Location Owner Date Sold Sale Price Gain (Loss) on Sale 2018 Disposition Sherman Avenue - New York, NY Fund II Apr 17, 2018 $ 26,000 $ 33 Lake Montclair - Dumfries, VA Fund IV Aug 27, 2018 22,450 2,923 1861 Union Street - San Francisco, CA Fund IV Aug 29, 2018 6,000 2,184 210 Bowery - 4 Residential Condos - New York, NY Fund IV Nov 30, 2018, Dec 10, 2018, Dec 17, 2018, Dec 21, 2018 12,050 — Total 2018 Dispositions $ 66,500 $ 5,140 2017 Dispositions New Hyde Park Shopping Center - New Hyde Park, NY Fund III Jul 6, 2017 $ 22,075 $ 6,433 216th Street - New York, NY Fund II Sep 11, 2017 30,579 6,543 City Point Condominium Tower I - Brooklyn, NY Fund II Oct 13, 2017 96,000 (810 ) 1151 Third Avenue - New York, NY Fund IV Nov 16, 2017 27,000 5,183 260 E 161st Street - Bronx, NY Fund II Dec 13, 2017 105,684 31,537 Total 2017 Dispositions $ 281,338 $ 48,886
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The aggregate revenue, expenses and pre-tax income reported within continuing operations for the aforementioned consolidated properties that were sold during the years ended December 31, 2018, December 31, 2017 and December 31, 2016 were as follows (in thousands): Year Ended December 31, 2018 2017 2016 Revenues $ 1,968 $ 16,249 $ 20,097 Expenses (1,874 ) (20,529 ) (17,079 ) Loss (income) from continuing operations of disposed properties before gain on disposition of properties 94 (4,280 ) 3,018 Gain on disposition of properties 5,140 48,886 81,965 Net income attributable to noncontrolling interests (3,368 ) (32,254 ) (70,714 ) Net income attributable to Acadia $ 1,866 $ 12,352 $ 14,269
Schedule of Development in Process Activities	Development activity for the Company’s consolidated properties comprised the following during the periods presented (dollars in thousands): December 31, 2017 Year Ended 2018 December 31, 2018 Number of Properties Carrying Value Transfers In Capitalized Costs Transfers Out Number of Properties Carrying Value Core 2 $ 21,897 $ — $ 6,320 $ 20,458 1 $ 7,759 Fund II — 4,908 — 2,554 — — 7,462 Fund III 2 63,939 — 36,117 78,814 1 21,242 Fund IV 1 82,958 — 876 — 1 83,834 Total 5 $ 173,702 $ — $ 45,867 $ 99,272 3 $ 120,297

Notes Receivable, Net (Tables)

Notes Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Accounts And Notes Receivable Net [Abstract]
Schedule of Notes Receivable	The Company’s notes receivable, net were collateralized either by the underlying properties or the borrower’s ownership interest in the entities that own the properties, and were as follows (dollars in thousands): December 31, December 31, December 31, 2018 Description 2018 2017 Number Maturity Date Interest Rate Core Portfolio $ 56,475 $ 101,695 2 Apr 2019 - Apr 2020 6.0% - 8.1% Fund II 32,582 31,778 1 May 2020 2.5% Fund III 5,306 5,106 1 Jul 2020 18.0% Fund IV 15,250 15,250 1 Feb 2021 15.3% $ 109,613 $ 153,829 5

Investments in and Advances t_2

Investments in and Advances to Unconsolidated Affiliates (Tables)	12 Months Ended
	Dec. 31, 2018
Equity Method Investments And Joint Ventures [Abstract]
Schedule of Equity Method Investments	The Company’s investments in and advances to unconsolidated affiliates consist of the following (dollars in thousands): Nominal Ownership Interest December 31, December 31, Portfolio Property December 31, 2018 2018 2017 Core: 840 N. Michigan (a) 88.43% $ 65,013 $ 69,846 Renaissance Portfolio 20% 32,458 35,041 Gotham Plaza 49% 29,550 29,416 Town Center (a, b) 75.22% 99,758 78,801 Georgetown Portfolio 50% 4,653 3,479 231,432 216,583 Mervyns I & II: KLA/Mervyn's, LLC (c) 10.5% — — Fund III: Fund III Other Portfolio 90% 21 167 Self Storage Management (d) 95% 206 206 227 373 Fund IV: Broughton Street Portfolio (e) 50% 3,236 48,335 Fund IV Other Portfolio 90% 14,540 20,199 650 Bald Hill Road 90% 12,880 13,609 30,656 82,143 Various Funds: Due (to) from Related Parties (f) (461 ) 2,415 Other (g) 556 556 Investments in and advances to unconsolidated affiliates $ 262,410 $ 302,070 Core: Crossroads (h) 49% $ 15,623 $ 15,292 Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,623 $ 15,292 (a) Represents a tenancy-in-common interest. (b) During November 2017 and March 2018, as discussed below, the Company increased its ownership in Town Center. (c) Distributions, discussed below, have exceeded the Company’s non-recourse investment, therefore the carrying value is zero. (d) Represents a variable interest entity for which the Company was determined not to be the primary beneficiary. (e) The Company is entitled to a 15% return on its cumulative capital contribution which was $3.0 million and $15.4 million at December 31, 2018 and December 31, 2017, respectively. In addition, the Company is entitled to a 9% preferred return on a portion of its equity, which was $2.8 million and $41.2 million at December 31, 2018 and December 31, 2017, respectively. (f) Represents deferred fees. (g) Includes a cost-method investment in Albertson’s ( Note 8 (h) Distributions have exceeded the Company’s investment; however, the Company recognizes a liability balance as it may be required to return distributions to fund future obligations of the entity.
Schedule of Condensed Balance Sheet	The following combined and condensed Balance Sheets and Statements of Income, in each period, summarize the financial information of the Company’s investments in unconsolidated affiliates (in thousands): December 31, 2018 2017 Combined and Condensed Balance Sheets Assets: Rental property, net $ 488,000 $ 518,900 Real estate under development — 26,681 Investment in unconsolidated affiliates 6,853 6,853 Other assets 91,497 100,901 Total assets $ 586,350 $ 653,335 Liabilities and partners’ equity: Mortgage notes payable $ 408,967 $ 405,652 Other liabilities 54,675 61,932 Partners’ equity 122,708 185,751 Total liabilities and partners’ equity $ 586,350 $ 653,335 Company's share of accumulated equity $ 141,384 $ 185,533 Basis differential 104,084 95,358 Deferred fees, net of portion related to the Company's interest 1,780 3,472 Amounts (payable) receivable by the Company (461 ) 2,415 Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates 246,787 286,778 Company's share of distributions in excess of income from and investments in unconsolidated affiliates 15,623 15,292 Investments in and advances to unconsolidated affiliates $ 262,410 $ 302,070
Schedule of Condensed Income Statement	Year Ended December 31, 2018 2017 2016 Combined and Condensed Statements of Income Total revenues $ 80,184 $ 83,222 $ 84,218 Operating and other expenses (23,586 ) (24,711 ) (25,724 ) Interest expense (19,954 ) (18,733 ) (16,300 ) Depreciation and amortization (22,228 ) (24,192 ) (35,432 ) Loss on debt extinguishment — (154 ) — (Loss) gain on disposition of properties (1,673 ) 18,957 (1,340 ) Net income attributable to unconsolidated affiliates $ 12,743 $ 34,389 $ 5,422 Company’s share of equity in net income of unconsolidated affiliates $ 12,345 $ 26,039 $ 40,538 Basis differential amortization (3,043 ) (2,668 ) (1,089 ) Company’s equity in earnings of unconsolidated affiliates $ 9,302 $ 23,371 $ 39,449

Other Assets, Net and Account_2

Other Assets, Net and Accounts Payable and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Schedule of Other Assets and Other Liabilities	Other assets, net and accounts payable and other liabilities are comprised of the following for the periods presented: December 31, (in thousands) 2018 2017 Other Assets, Net: Lease intangibles, net ( Note 6 ) $ 115,939 $ 127,571 Deferred charges, net (a) 28,619 24,589 Prepaid expenses 18,422 16,838 Other receivables 5,058 11,356 Accrued interest receivable 17,046 11,668 Deposits 4,611 6,296 Due from seller 4,000 4,300 Deferred tax assets 2,032 2,096 Derivative financial instruments ( Note 8 ) 7,018 4,402 Due from related parties 1,802 1,479 Corporate assets 1,953 2,369 Income taxes receivable 2,070 1,995 $ 208,570 $ 214,959 (a) Deferred Charges, Net: Deferred leasing and other costs $ 45,011 $ 41,020 Deferred financing costs related to line of credit 8,960 7,786 53,971 48,806 Accumulated amortization (25,352 ) (24,217 ) Deferred charges, net $ 28,619 $ 24,589 Accounts Payable and Other Liabilities: Lease intangibles, net ( Note 6 ) $ 95,045 $ 104,478 Accounts payable and accrued expenses 65,215 61,420 Deferred income 34,052 31,306 Tenant security deposits, escrow and other 10,588 10,029 Derivative financial instruments ( Note 8 ) 7,304 1,467 Income taxes payable 19 176 Other 2,738 1,176 $ 214,961 $ 210,052

Lease Intangibles (Tables)

Lease Intangibles (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Liabilities Included in Other Assets and Other Liabilities	Intangible assets and liabilities are included in other assets and other liabilities ( Note 5 December 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortizable Intangible Assets In-place lease intangible assets $ 216,021 $ (105,972 ) $ 110,049 $ 193,821 $ (72,749 ) $ 121,072 Above-market rent 18,169 (12,279 ) 5,890 16,786 (10,287 ) 6,499 $ 234,190 $ (118,251 ) $ 115,939 $ 210,607 $ (83,036 ) $ 127,571 Amortizable Intangible Liabilities Below-market rent $ (152,188 ) $ 57,721 $ (94,467 ) $ (147,232 ) $ 43,391 $ (103,841 ) Above-market ground lease (671 ) 93 (578 ) (671 ) 34 (637 ) $ (152,859 ) $ 57,814 $ (95,045 ) $ (147,903 ) $ 43,425 $ (104,478 )
Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities	The scheduled amortization of acquired lease intangible assets and assumed liabilities as of December 31, 2018 is as follows (in thousands): Years Ending December 31, Net Increase in Lease Revenues Increase to Amortization Reduction of Rent Expense Net Income (Expense) 2019 $ 8,431 $ (27,309 ) $ 58 $ (18,820 ) 2020 8,206 (20,511 ) 58 (12,247 ) 2021 7,725 (15,196 ) 58 (7,413 ) 2022 7,346 (10,467 ) 58 (3,063 ) 2023 7,053 (8,192 ) 58 (1,081 ) Thereafter 49,816 (28,374 ) 288 21,730 Total $ 88,577 $ (110,049 ) $ 578 $ (20,894 )

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Summary of Consolidated Indebtedness	A summary of the Company’s consolidated indebtedness is as follows (dollars in thousands): Interest Rate at Carrying Value at December 31, December 31, Maturity Date at December 31, December 31, 2018 2017 December 31, 2018 2018 2017 Mortgages Payable Core Fixed Rate 3.88%-6.00% 3.88%-5.89% Feb 2024 - Apr 2035 $ 178,271 $ 179,870 Core Variable Rate - Swapped ( a) 3.41%-5.67% 3.41%-5.67% Jan 2023 - Nov 2028 82,583 74,152 Total Core Mortgages Payable 260,854 254,022 Fund II Fixed Rate 1.00%-4.75% 1.00%-4.75% May 2020 - Aug 2042 205,262 205,262 Fund II Variable Rate - Swapped ( a) 4.27% 4.27% Nov 2021 19,325 19,560 Total Fund II Mortgages Payable 224,587 224,822 Fund III Variable Rate LIBOR+2.65%-LIBOR+4.65% Prime+0.50%-LIBOR+4.65% Jun 2020 - Dec 2021 90,096 65,866 Fund IV Fixed Rate 3.40%-4.50% 3.40%-4.50% Oct 2025 - Jun 2026 8,189 10,503 Fund IV Variable Rate LIBOR+1.60%-LIBOR+3.95% LIBOR+1.70%-LIBOR+3.95% Feb 2019 - Aug 2021 233,065 250,584 Fund IV Variable Rate - Swapped ( a) 3.67%-4.23% 3.67%-4.23% May 2019 - Dec 2022 71,841 86,851 Total Fund IV Mortgages Payable 313,095 347,938 Fund V Variable Rate LIBOR+2.15%-LIBOR+2.25% LIBOR+2.25% Oct 2020 - Jan 2021 51,506 28,613 Fund V Variable Rate - Swapped (a) 4.61%-4.78% — Feb 2021 - Jun 2021 86,570 — Total Fund V Mortgage Payable 138,076 28,613 Net unamortized debt issuance costs (10,173 ) (12,943 ) Unamortized premium 753 856 Total Mortgages Payable $ 1,017,288 $ 909,174 Unsecured Notes Payable Core Term Loans LIBOR+1.25% — Mar 2023 $ 383 $ — Core Variable Rate Unsecured Term Loans - Swapped (a) 2.49%-4.05% 2.54%-3.59% Mar 2023 349,617 300,000 Total Core Unsecured Notes Payable 350,000 300,000 Fund II Unsecured Notes Payable LIBOR+1.65% LIBOR+1.40% Sep 2020 40,000 31,500 Fund IV Term Loan/Subscription Facility LIBOR+1.65%-LIBOR+2.75% LIBOR+1.65%-LIBOR+2.75% Oct 2019 - Dec 2019 40,825 40,825 Fund V Subscription Facility LIBOR+1.60% LIBOR+1.60% May 2020 102,800 103,300 Net unamortized debt issuance costs (368 ) (1,890 ) Total Unsecured Notes Payable $ 533,257 $ 473,735 Unsecured Line of Credit Core Unsecured Line of Credit LIBOR+1.35% LIBOR+1.40% Mar 2022 $ — $ 18,048 Core Unsecured Line of Credit - Swapped (a) 4.15%-5.02% 4.20%-5.07% Mar 2022 — 23,452 Total Unsecured Line of Credit $ — $ 41,500 Total Debt - Fixed Rate (b) $ 1,001,658 $ 899,650 Total Debt - Variable Rate (c) 558,675 538,736 Total Debt 1,560,333 1,438,386 Net unamortized debt issuance costs (10,541 ) (14,833 ) Unamortized premium 753 856 Total Indebtedness $ 1,550,545 $ 1,424,409 (a) At December 31, 2018, the stated rates ranged from LIBOR + 1.70% to LIBOR +1.90% for Core variable-rate debt; LIBOR + 1.39% for Fund II variable-rate debt; LIBOR + 2.65% to LIBOR + 4.65% for Fund III variable-rate debt; LIBOR + 1.60% to LIBOR +3.95% for Fund IV variable-rate debt; LIBOR + 2.15% to LIBOR + 2.25% for Fund V variable-rate debt; LIBOR + 1.25% for Core variable-rate unsecured term loans; and LIBOR + 1.35% for Core variable-rate unsecured lines of credit. (b) Includes $609.9 million and $504.0 million, respectively, of variable-rate debt that has been fixed with interest rate swap agreements as of the periods presented. (c) Includes $143.8 million and $141.1 million, respectively, of variable-rate debt that is subject to interest cap agreements.
Scheduled Principal Repayments	The scheduled principal repayments of the Company’s consolidated indebtedness, as of December 31, 2018 are as follows (in thousands): Year Ending December 31, 2019 $ 219,118 2020 527,304 2021 180,511 2022 48,528 2023 370,680 Thereafter 214,192 1,560,333 Unamortized premium 753 Net unamortized debt issuance costs (10,541 ) Total indebtedness $ 1,550,545

Financial Instruments and Fai_2

Financial Instruments and Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents the Company’s fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis (in thousands): December 31, 2018 December 31, 2017 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Money Market Funds $ 4,504 $ — $ — $ 3 $ — $ — Derivative financial instruments — 7,018 — — 4,402 — Liabilities Derivative financial instruments — 7,304 — — 1,467 —
Schedule of Derivative Financial Instruments	The Company had the following interest rate swaps for the periods presented (dollars in thousands): Strike Rate Fair Value Derivative Instrument Aggregate Notional Amount Effective Date Maturity Date Low High Balance Sheet Location December 31, 2018 December 31, 2017 Core Interest Rate Swaps $ 111,117 Dec 2012 - Jul 2020 Dec 2022 - Jul 2030 2.80 % — 3.77 % Other Liabilities (a) $ (6,332 ) $ (1,438 ) Interest Rate Swaps 321,083 Feb 2013 - Dec 2017 Nov 2019 - Jul 2027 1.24 % — 3.77 % Other Assets 6,022 4,076 $ 432,200 $ (310 ) $ 2,638 Fund II Interest Rate Swap $ 19,325 Oct 2014 Nov 2021 2.88 % — 2.88 % Other Assets $ 108 $ — Interest Rate Swap — Oct 2014 Nov 2021 2.88 % — 2.88 % Other Liabilities — (29 ) $ 19,325 $ 108 $ (29 ) Fund III Interest Rate Cap $ 58,000 Dec 2016 Jan 2020 3.00 % — 3.00 % Other Assets $ 8 $ 14 Fund IV Interest Rate Swaps $ 71,841 Mar 2017 - Nov 2017 Mar 2020 - Dec 2022 1.82 % — 2.11 % Other Assets $ 851 $ 295 Interest Rate Caps 108,900 July 2016 - Nov 2016 Aug 2019 - Dec 2019 3.00 % — 3.00 % Other Assets 8 17 $ 180,741 $ 859 $ 312 Fund V Interest Rate Swap $ 16,900 Jan 2018 Feb 2021 2.41 % — 2.41 % Other Assets $ 21 $ — Interest Rate Swaps 69,670 Jun 2018 Jun 2021 - Jun 2023 2.78 % — 2.88 % Other Liabilities (972 ) — $ 86,570 $ (951 ) $ — Total asset derivatives $ 7,018 $ 4,402 Total liability derivatives $ (7,304 ) $ (1,467 ) (a) Includes two swaps with a fair value of ($2.9) million which were acquired during July 2018 and are not effective until July 2020.
Financial statements of Income (Losses) Recognized Related to Cash Flow Hedges	The following table presents the location in the financial statements of the income (losses) recognized related to the Company’s cash flow hedges (in thousands): Year Ended December 31, 2018 2017 2016 Amount of (loss) income recognized in other comprehensive income $ (2,659 ) $ 634 $ (646 ) Amount of loss subsequently reclassified to earnings 71 3,317 4,576
Schedule of Other Financial Instruments Carrying Values and Fair values	The Company’s other financial instruments had the following carrying values and fair values as of the dates shown (dollars in thousands, inclusive of amounts attributable to noncontrolling interests where applicable): December 31, 2018 December 31, 2017 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Notes Receivable (a) 3 $ 109,613 $ 107,370 $ 153,829 $ 151,712 Mortgage and Other Notes Payable (a) 3 1,026,708 1,021,075 921,261 921,891 Investment in non-traded equity securities (b) 3 — 23,208 — 22,824 Unsecured notes payable and Unsecured line of credit (c) 2 533,625 533,954 517,125 515,330 (a) The Company determined the estimated fair value of these financial instruments using a discounted cash flow model with rates that take into account the credit of the borrower or tenant, where applicable, and interest rate risk. The Company also considered the value of the underlying collateral, taking into account the quality of the collateral, the credit quality of the borrower, the time until maturity and the current market interest rate environment. (b) Represents Fund II’s cost-method investment in Albertson’s supermarkets ( Note 4 (c) The Company determined the estimated fair value of the unsecured notes payable and unsecured line of credit using quoted market prices in an open market with limited trading volume where available. In cases where there was no trading volume, the Company determined the estimated fair value using a discounted cash flow model using a rate that reflects the average yield of similar market participants.

Shareholders' Equity, Noncont_2

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract]
Summary of Activity in Accumulated Other Comprehensive Income	The following table sets forth the activity in accumulated other comprehensive income for the years ended December 31, 2018, 2017 and 2016 (in thousands): Gains or Losses on Derivative Instruments Balance at January 1, 2018 $ 2,614 Other comprehensive loss before reclassifications (2,659 ) Reclassification of realized interest on swap agreements 71 Net current period other comprehensive loss (2,588 ) Net current period other comprehensive loss attributable to noncontrolling interests 490 Balance at December 31, 2018 $ 516 Balance at January 1, 2017 $ (798 ) Other comprehensive income before reclassifications 634 Reclassification of realized interest on swap agreements 3,317 Net current period other comprehensive income 3,951 Net current period other comprehensive income attributable to noncontrolling interests (539 ) Balance at December 31, 2017 $ 2,614 Balance at January 1, 2016 $ (4,463 ) Other comprehensive loss before reclassifications (646 ) Reclassification of realized interest on swap agreements 4,576 Net current period other comprehensive income 3,930 Net current period other comprehensive income attributable to noncontrolling interests (265 ) Balance at December 31, 2016 $ (798 )
Summary of Change in Noncontrolling Interest	The following table summarizes the change in the noncontrolling interests for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands): Noncontrolling Interests in Operating Partnership (a) Noncontrolling Interests in Partially-Owned Affiliates (b) Total Balance at January 1, 2018 $ 102,921 $ 545,519 $ 648,440 Distributions declared of $1.09 per Common OP Unit (6,888 ) — (6,888 ) Net income (loss) for the year ended December 31, 2018 2,572 (49,709 ) (47,137 ) Conversion of 117,978 Common OP Units to Common Shares by limited partners of the Operating Partnership (2,068 ) — (2,068 ) Other comprehensive loss - unrealized loss on valuation of swap agreements (129 ) (681 ) (810 ) Reclassification of realized interest expense on swap agreements (3 ) 323 320 Noncontrolling interest contributions — 47,560 47,560 Noncontrolling interest distributions — (24,793 ) (24,793 ) Employee Long-term Incentive Plan Unit Awards 12,374 — 12,374 Rebalancing adjustment (c) (4,556 ) — (4,556 ) Balance at December 31, 2018 $ 104,223 $ 518,219 $ 622,442 Balance at January 1, 2017 $ 95,422 $ 494,126 $ 589,548 Distributions declared of $1.05 per Common OP Unit (6,453 ) — (6,453 ) Net income (loss) for the year ended December 31, 2017 4,159 (1,321 ) 2,838 Conversion of 81,453 Common OP Units and 5,000 Preferred OP Units to Common Shares by limited partners of the Operating Partnership (1,541 ) — (1,541 ) Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements 85 (232 ) (147 ) Reclassification of realized interest expense on swap agreements 141 545 686 Noncontrolling interest contributions — 85,206 85,206 Noncontrolling interest distributions — (32,805 ) (32,805 ) Employee Long-term Incentive Plan Unit Awards 10,457 — 10,457 Rebalancing adjustment (c) 651 — 651 Balance at December 31, 2017 $ 102,921 $ 545,519 $ 648,440 Balance at January 1, 2016 $ 96,340 $ 324,526 $ 420,866 Distributions declared of $1.16 per Common OP Unit (6,753 ) — (6,753 ) Net income for the year ended December 31, 2016 5,002 56,814 61,816 Conversion of 351,250 Common OP Units to Common Shares by limited partners of the Operating Partnership (7,892 ) — (7,892 ) Issuance of Common and Preferred OP Units to acquire real estate 31,429 — 31,429 Acquisition of noncontrolling interests — (25,925 ) (25,925 ) Other comprehensive loss - unrealized loss on valuation of swap agreements (43 ) (289 ) (332 ) Change in control of previously unconsolidated investment — (75,713 ) (75,713 ) Reclassification of realized interest expense on swap agreements 223 374 597 Noncontrolling interest contributions — 295,108 295,108 Noncontrolling interest distributions — (80,769 ) (80,769 ) Employee Long-term Incentive Plan Unit Awards 12,768 — 12,768 Rebalancing adjustment (c) (35,652 ) — (35,652 ) Balance at December 31, 2016 $ 95,422 $ 494,126 $ 589,548 (a) Noncontrolling interests in the Operating Partnership are comprised of (i) the limited partners’ 3,329,640, 3,328,873 and 3,308,875 Common OP Units at December 31, 2018, 2017 and 2016, respectively; (ii) 188 Series A Preferred OP Units at December 31, 2018, 2017 and 2016; (iii) 136,593 Series C Preferred OP Units at December 31, 2018, 2017 and 2016; and (iv) 2,569,044, 2,274,147 and 1,997,099 LTIP units at December 31, 2018, 2017 and 2016, respectively, as discussed in Share Incentive Plan (). Distributions declared for Preferred OP Units are reflected in net income (loss) in the table above. (b) Noncontrolling interests in partially-owned affiliates comprise third-party interests in Funds II, III, IV and V, and Mervyns I and II, and six other subsidiaries. (c) Adjustment reflects the difference between the fair value of the consideration received or paid and the book value of the Common Shares, Common OP Units, Preferred OP Units, and LTIP Units involving changes in ownership (the “Rebalancing”).

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Schedule of Future Minimum Rental Revenues and Payments for Operating and Capital Leases	The scheduled future minimum (i) rental revenues from rental properties under the terms of non-cancelable tenant leases greater than one year (assuming no new or renegotiated leases or option extensions for such premises) and (ii) rental payments under the terms of all non-cancelable operating and capital leases in which the Company is the lessee, principally for office space, land and equipment, as of December 31, 2018, are summarized as follows (in thousands): Year Ending December 31, Minimum Rental Revenues Minimum Rental Payments 2019 $ 187,158 $ 4,775 2020 178,691 4,571 2021 159,749 4,354 2022 139,294 4,404 2023 121,456 4,425 Thereafter 513,853 180,618 Total $ 1,300,201 $ 203,147

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Summary of Segment Information	The following tables set forth certain segment information for the Company (in thousands): As of or for the Year Ended December 31, 2018 Core Portfolio Funds Structured Financing Unallocated Total Revenues $ 167,894 $ 94,319 $ — $ — $ 262,213 Depreciation and amortization (60,903 ) (56,646 ) — — (117,549 ) Property operating expenses, other operating and real estate taxes (45,138 ) (37,642 ) — — (82,780 ) General and administrative expenses — — — (34,343 ) (34,343 ) Operating income 61,853 31 — (34,343 ) 27,541 Gain on disposition of properties — 5,140 — — 5,140 Interest income — — 13,231 — 13,231 Equity in earnings of unconsolidated affiliates inclusive of gains on disposition of properties (a) 7,415 1,887 — — 9,302 Interest expense (27,575 ) (42,403 ) — — (69,978 ) Income tax provision — — — (934 ) (934 ) Net income 41,693 (35,345 ) 13,231 (35,277 ) (15,698 ) Net loss attributable to noncontrolling interests 752 46,385 — — 47,137 Net income attributable to Acadia $ 42,445 $ 11,040 $ 13,231 $ (35,277 ) $ 31,439 Real estate at cost $ 2,069,439 $ 1,628,366 $ — $ — $ 3,697,805 Total assets $ 2,232,695 $ 1,616,472 $ 109,613 $ — $ 3,958,780 Cash paid for acquisition of real estate $ 1,343 $ 146,642 $ — $ — $ 147,985 Cash paid for development and property improvement costs $ 32,662 $ 62,172 $ — $ — $ 94,834 As of or for the Year Ended December 31, 2017 Core Portfolio Funds Structured Financing Unallocated Total Revenues $ 169,975 $ 80,287 $ — $ — $ 250,262 Depreciation and amortization (61,705 ) (43,229 ) — — (104,934 ) Property operating expenses, other operating and real estate taxes (45,349 ) (34,449 ) — — (79,798 ) General and administrative expenses — — — (33,756 ) (33,756 ) Impairment charge — (14,455 ) — — (14,455 ) Operating income (loss) 62,921 (11,846 ) — (33,756 ) 17,319 Gain on disposition of properties — 48,886 — — 48,886 Interest income — — 29,143 — 29,143 Equity in earnings of unconsolidated affiliates inclusive of gains on disposition of properties (a) 3,735 19,636 — — 23,371 Interest expense (28,618 ) (30,360 ) — — (58,978 ) Gain on change in control 5,571 — — — 5,571 Income tax provision — — — (1,004 ) (1,004 ) Net income 43,609 26,316 29,143 (34,760 ) 64,308 Net income attributable to noncontrolling interests (1,107 ) (1,731 ) — — (2,838 ) Net income attributable to Acadia $ 42,502 $ 24,585 $ 29,143 $ (34,760 ) $ 61,470 Real estate at cost $ 2,032,485 $ 1,433,997 $ — $ — $ 3,466,482 Total assets $ 2,305,663 $ 1,500,755 $ 153,829 $ — $ 3,960,247 Cash paid for acquisition of real estate $ — $ 200,429 $ — $ — $ 200,429 Cash paid for development and property improvement costs $ 42,026 $ 66,116 $ — $ — $ 108,142 As of or for the Year Ended December 31, 2016 Core Portfolio Funds Structured Financing Unallocated Total Revenues $ 150,211 $ 39,728 $ — $ — $ 189,939 Depreciation and amortization (54,582 ) (15,429 ) — — (70,011 ) Property operating expenses, other operating and real estate taxes (39,598 ) (17,793 ) — — (57,391 ) General and administrative expenses — — — (40,648 ) (40,648 ) Operating income 56,031 6,506 — (40,648 ) 21,889 Gain on disposition of properties — 81,965 — — 81,965 Interest income — — 25,829 — 25,829 Equity in earnings of unconsolidated affiliates inclusive of gains on disposition of properties (a) 3,774 35,675 — — 39,449 Interest expense (27,435 ) (7,210 ) — — (34,645 ) Income tax benefit — — — 105 105 Net income 32,370 116,936 25,829 (40,543 ) 134,592 Net income attributable to noncontrolling interests (3,411 ) (58,405 ) — — (61,816 ) Net income attributable to Acadia $ 28,959 $ 58,531 $ 25,829 $ (40,543 ) $ 72,776 Real estate at cost $ 1,982,763 $ 1,399,237 $ — $ — $ 3,382,000 Total assets $ 2,271,620 $ 1,448,177 $ 276,163 $ — $ 3,995,960 Cash paid for acquisition of real estate $ 323,880 $ 171,764 $ — $ — $ 495,644 Cash paid for development and property improvement costs $ 13,434 $ 136,000 $ — $ — $ 149,434 (a) Equity in earnings of unconsolidated affiliates for the Core segment includes $5.8 million, $1.9 million and $0.9 million related to one unconsolidated affiliate, Town Center, for the years ended December 31, 2018, 2017 and 2016, respectively. During 2017 and 2018, the Company increased its ownership in its Town Center investment from 22.22% to 75.22% (). Effective in 2018, the Company consolidated a property association entity that incurs all property-related costs associated with Town Center. Such costs aggregated $0.7 million for the year ended December 31, 2018 and are included in depreciation and amortization and property operating expenses other operating and real estate taxes within the Core segment.

Share Incentive and Other Com_2

Share Incentive and Other Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Unvested Restricted Shares and LTIP Units	A summary of the status of the Company’s unvested Restricted Shares and LTIP Units is presented below: Unvested Restricted Shares and LTIP Units Common Restricted Shares Weighted Grant-Date Fair Value LTIP Units Weighted Grant-Date Fair Value Unvested at January 1, 2016 49,899 $ 25.90 1,020,121 $ 23.92 Granted 21,675 33.35 359,484 34.40 Vested (24,886 ) 29.17 (522,680 ) 26.08 Forfeited (189 ) 35.37 (48 ) 35.37 Unvested at December 31, 2016 46,499 $ 27.58 856,877 $ 26.99 Granted 19,442 29.85 310,551 31.80 Vested (23,430 ) 30.47 (257,124 ) 28.27 Forfeited (1,184 ) 32.65 (205 ) 32.49 Unvested at December 31, 2017 41,327 26.92 910,099 28.28 Granted 22,817 23.65 425,880 26.80 Vested (25,261 ) 30.79 (431,827 ) 29.72 Forfeited (428 ) 27.25 (12,266 ) 28.57 Unvested at December 31, 2018 38,455 $ 22.44 891,886 $ 26.87

Federal Income Taxes (Tables)

Federal Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Reconciliation of Net Income to Taxable Income	Reconciliation of GAAP net income attributable to Acadia to taxable income is as follows: Year Ended December 31, (in thousands) 2018 2017 2016 Net income attributable to Acadia $ 31,439 $ 61,470 $ 72,776 Deferred cancellation of indebtedness income 2,050 2,050 2,050 Deferred rental and other income (a) 1,222 (934 ) 1,610 Book/tax difference - depreciation and amortization (a) 23,166 21,334 15,189 Straight-line rent and above- and below-market rent adjustments (a) (12,129 ) (10,559 ) (7,882 ) Book/tax differences - equity-based compensation 6,042 5,325 10,307 Joint venture equity in earnings, net (a) 13,905 9,114 (2,011 ) Impairment charges and reserves — — 769 Acquisition costs (a) 326 1,135 5,116 Gains — (5,181 ) — Book/tax differences - miscellaneous (2,821 ) 930 (4,924 ) Taxable income $ 63,200 $ 84,684 $ 93,000 Distributions declared $ 89,122 $ 87,848 $ 91,053 (a) Adjustments from certain subsidiaries and affiliates, which are consolidated for financial reporting but not for tax reporting, are included in the reconciliation item “Joint venture equity in earnings, net.”
Schedule of Tax Status of Dividends	The Company has determined that the cash distributed to the shareholders for the periods presented is characterized as follows for Federal income tax purposes: Year Ended December 31, 2018 2017 2016 Per Share % Per Share % Per Share % Ordinary income - Non-Section 199A — — % $ 0.82 78 % $ 0.77 66 % Ordinary income - Section 199A $ 0.87 100 % — — % — — % Qualified dividend — — % — — % — — % Capital gain — — % 0.23 22 % 0.39 34 % Total (b) $ 0.87 100 % $ 1.05 100 % $ 1.16 100 % (b) The fourth quarter 2018 regular dividend was $0.28 per common share of which approximately $0.06 was allocable to 2018 and approximately $0.22 is allocable to 2019.
Schedule of TRS Income and Provision for Income Taxes	Income taxes have been provided for using the liability method as required by ASC Topic 740, “Income Taxes.” The Company’s TRS income and provision for income taxes associated with the TRS for the periods presented are summarized as follows (in thousands): Year Ended December 31, 2018 2017 2016 TRS loss before income taxes $ (2,609 ) $ (3,604 ) $ (1,583 ) (Provision) benefit for income taxes: Federal (377 ) (982 ) 378 State and local 26 423 97 TRS net loss before noncontrolling interests (2,960 ) (4,163 ) (1,108 ) Noncontrolling interests 4 8 (9 ) TRS net loss $ (2,956 ) $ (4,155 ) $ (1,117 )
Schedule of Effective Income Tax Rate Reconciliation	The income tax provision for the Company differs from the amount computed by applying the statutory Federal income tax rate to income before income taxes as follows. Amounts are not adjusted for temporary book/tax differences (in thousands): Year Ended December 31, 2018 2017 2016 Federal tax benefit at statutory tax rate $ (548 ) $ (1,225 ) $ (538 ) TRS state and local taxes, net of Federal benefit (165 ) (190 ) (84 ) Tax effect of: Permanent differences, net 951 1,131 1,663 Prior year over-accrual, net — (1,541 ) — Effect of Tax Cuts and Jobs Act — 1,982 — Other 172 404 (1,516 ) REIT state and local income and franchise taxes 524 443 370 Total provision (benefit) for income taxes $ 934 $ 1,004 $ (105 )

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Year Ended December 31, (dollars in thousands) 2018 2017 2016 Numerator: Net income attributable to Acadia $ 31,439 $ 61,470 $ 72,776 Less: net income attributable to participating securities (267 ) (642 ) (793 ) Income from continuing operations net of income attributable to participating securities $ 31,172 $ 60,828 $ 71,983 Denominator: Weighted average shares for basic earnings per share 82,080,159 83,682,789 76,231,000 Effect of dilutive securities: Employee unvested restricted shares — 2,682 12,550 Denominator for diluted earnings per share 82,080,159 83,685,471 76,243,550 Basic and diluted earnings per Common Share from continuing operations attributable to Acadia $ 0.38 $ 0.73 $ 0.94 Anti-Dilutive Shares Excluded from Denominator: Series A Preferred OP Units 188 188 188 Series A Preferred OP Units - Common share equivalent 25,067 25,067 25,067 Series C Preferred OP Units 136,593 136,593 141,593 Series C Preferred OP Units - Common share equivalent 474,278 479,978 410,207 Restricted shares 36,879 41,299 50,156

Summary of Quarterly Financia_2

Summary of Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The quarterly results of operations of the Company for the years ended December 31, 2018 and 2017 are as follows (in thousands, except per share amounts): Three Months Ended (a) March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018 Revenues $ 63,124 $ 63,569 $ 66,075 $ 69,445 Net loss (4,160 ) (2,270 ) (2,597 ) (6,671 ) Net loss attributable to noncontrolling interests 11,579 9,935 11,822 13,801 Net income attributable to Acadia 7,419 7,665 9,225 7,130 Earnings per share attributable to Acadia: Basic $ 0.09 $ 0.09 $ 0.11 $ 0.09 Diluted 0.09 0.09 0.11 0.09 Weighted average number of shares: Basic 83,434 81,756 81,566 81,591 Diluted 83,438 81,756 81,566 81,591 Cash dividends declared per Common Share $ 0.27 $ 0.27 $ 0.27 $ 0.28 (a) The three months ended September 30, 2018 includes an aggregate $5.1 million gain on the sales of two consolidated Fund IV properties (), of which $3.9 million was attributable to noncontrolling interests. Three Months Ended (a, b, c, d) March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 Revenues $ 61,999 $ 59,504 $ 62,678 $ 66,081 Net income 19,971 6,108 13,285 24,944 Net (income) loss attributable to noncontrolling interests (4,340 ) 5,952 (418 ) (4,032 ) Net income attributable to Acadia 15,631 12,060 12,867 20,912 Earnings per share attributable to Acadia: Basic Diluted $ 0.18 $ 0.14 $ 0.15 $ 0.25 0.18 0.14 0.15 0.25 Weighted average number of shares: Basic 83,635 83,662 83,700 83,733 Diluted 83,646 83,662 83,700 83,733 Cash dividends declared per Common Share $ 0.26 $ 0.26 $ 0.26 $ 0.27 (a) The three months ended March 31, 2017 includes the Company’s $2.7 million proportionate share of aggregate gains of $14.5 million on the sales of two unconsolidated properties (). (b) The three months ended June 30, 2017 includes the Company’s $0.8 million proportionate share of a $3.3 million gain on sale of an unconsolidated property ( Note 4 (c) The three months ended September 30, 2017 includes an aggregate $13.0 million gain on the sales of two consolidated properties ( Note 2 Note 8 (d) The three months ended December 31, 2017 includes a $5.6 million gain on change in control of interests ( Note 4 Note 2 Note 8

Organization, Basis of Presen_4

Organization, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018USD ($)propertysegment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Limited partnership to common stock conversion ratio	100.00%
Number of retail properties | property	171
Number of reportable segments | segment	3
Amount of goodwill recorded and acquisition costs capitalized	$ 0
Deferred Rent Receivables, Net	47,200,000	$ 37,400,000
Allowance for doubtful accounts receivable	7,900,000	5,900,000
Net cash provided by (used in) investing activities	(136,619,000)	4,063,000	$ (613,564,000)
Net cash provided by (used in) operating activities	96,076,000	114,655,000	109,848,000
Net cash (used in) provided by financing activities	(10,278,000)	(127,758,000)	488,365,000
Capitalized acquisition costs	300,000
Acquisition costs expensed	2,100,000	2,100,000	8,200,000
Capitalized internal leasing costs	1,400,000	1,300,000
Accounting Standards Update 2014-09
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Cumulative effect of new accounting principle during period		0
Accounting Standards Update 2016-15
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by (used in) investing activities		6,300,000
Net cash provided by (used in) operating activities		6,300,000
Accounting Standards Update 2016-18
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by (used in) operating activities		11,500,000	1,900,000
Net cash (used in) provided by financing activities		900,000	$ 9,900,000
Accounting Standards Update 2016-02
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Leases, future payment obligations	$ 203,100,000
REIT
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of distribute taxable income	90.00%
Percentage of taxable income.	100.00%
Buildings
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life	40 years
Building Improvements
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life	15 years
Furniture and fixtures | Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life	5 years
Furniture and fixtures | Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life	20 years
Core Portfolio
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties | property	118
Properties owned percentage	100.00%
Acquisition costs expensed		$ 1,200,000
Opportunity Funds
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties | property	53
Operating Partnership, as General Partner or Managing Member
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Equity interest held by Operating Partnership	94.00%	94.00%
Remaining funds rate of distribution to operating partnership (in percent)	20.00%
Institutional Investors
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Remaining funds rate of distribution to all partners (in percent)	80.00%

Organization, Basis of Presen_5

Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018
Fund II and Mervyns II
Variable Interest Entity [Line Items]
Operating Partnership Share of Capital		28.33%
Capital Called		$ 347.1
Unfunded Commitment		$ 0
Equity interest held by Operating Partnership		28.33%
Preferred Return		8.00%
Total Distributions		$ 146.6
Fund III
Variable Interest Entity [Line Items]
Operating Partnership Share of Capital		24.54%
Capital Called		$ 423.9
Unfunded Commitment		$ 26.1
Equity interest held by Operating Partnership		24.54%
Preferred Return		6.00%
Total Distributions		$ 551.9
Fund IV
Variable Interest Entity [Line Items]
Operating Partnership Share of Capital		23.12%
Capital Called		$ 420.8
Unfunded Commitment		$ 109.2
Equity interest held by Operating Partnership		23.12%
Preferred Return		6.00%
Total Distributions		$ 147.4
Fund V
Variable Interest Entity [Line Items]
Operating Partnership Share of Capital		20.10%
Capital Called		$ 85.1
Unfunded Commitment		$ 434.9
Equity interest held by Operating Partnership		20.10%
Preferred Return		6.00%
Total Distributions		$ 0
Fund II
Variable Interest Entity [Line Items]
Total Distributions	$ 15
Operating Partnership, as General Partner or Managing Member
Variable Interest Entity [Line Items]
Total Distributions	$ 4.3

Real Estate - Schedule of Real

Real Estate - Schedule of Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquisition And Disposition Of Properties And Discontinued Operations [Abstract]
Land	$ 710,469	$ 658,835
Buildings and improvements	2,594,828	2,406,488
Tenant improvements	151,154	131,850
Construction in progress	44,092	18,642
Properties under capital lease	76,965	76,965
Total	3,577,508	3,292,780
Less: Accumulated depreciation	(416,657)	(339,862)
Operating real estate, net	3,160,851	2,952,918
Real estate under development, at cost	120,297	173,702
Net investments in real estate	$ 3,281,148	$ 3,126,620

Real Estate - Schedule of Acqui

Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase Price	$ 186,463	$ 254,532
Core Portfolio
Business Acquisition [Line Items]
Purchase Price	$ 1,337	$ 42,800
Core Portfolio | Bedford Green Land Parcel | Bedford Hills, NY
Business Acquisition [Line Items]
Percent Acquired	100.00%
Purchase Price	$ 1,337
Core Portfolio | Market Square Shopping Center | Wilmington, DE
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 42,800
Fund IV
Business Acquisition [Line Items]
Purchase Price	$ 36,104	$ 44,492
Fund IV | Broughton Street Partners I | Savannah, GA (Conversion)
Business Acquisition [Line Items]
Percent Acquired	100.00%
Purchase Price	$ 36,104
Fund IV | Lincoln Place - Fairview Heights, IL | Fairview Heights, IL
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 35,350
Fund IV | Shaw's Plaza Waterville, ME | Windham, ME
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 9,142
Fund V
Business Acquisition [Line Items]
Purchase Price	$ 149,022	$ 167,240
Fund V | Trussville Promenade - Trussville, AL | Trussville, AL
Business Acquisition [Line Items]
Percent Acquired	100.00%
Purchase Price	$ 45,259
Fund V | Elk Grove Commons - Elk Grove, CA | Elk Grove, CA
Business Acquisition [Line Items]
Percent Acquired	100.00%
Purchase Price	$ 59,320
Fund V | Hiram Pavilion | Hiram, GA
Business Acquisition [Line Items]
Percent Acquired	100.00%
Purchase Price	$ 44,443
Fund V | Plaza Santa Fe - Santa Fe, NM | Santa Fe, NM
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 35,220
Fund V | Hickory Ridge - Hickory, NC | Hickory, NC
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 44,020
Fund V | New Towne Plaza - Canton, MI | Canton, MI
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 26,000
Fund V | Fairlane Green | Allen Park, MI
Business Acquisition [Line Items]
Percent Acquired		100.00%
Purchase Price		$ 62,000

Real Estate - Acquisitions and

Real Estate - Acquisitions and Conversions - Additional Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Capitalized acquisition costs									$ 300,000
Acquisition costs expensed									2,100,000	$ 2,100,000	$ 8,200,000
Debt assumed									0	0
Net (loss) income	$ (6,671,000)	$ (2,597,000)	$ (2,270,000)	$ (4,160,000)	$ 24,944,000	$ 13,285,000	$ 6,108,000	$ 19,971,000	(15,698,000)	64,308,000	$ 134,592,000
Consolidated Acquisitions And Conversions
Business Acquisition [Line Items]
Revenues									$ 9,000,000	$ 10,200,000
Type of Revenue [Extensible List]									us-gaap:RealEstateMember	us-gaap:RealEstateMember
Net (loss) income									$ 500,000	$ 3,500,000
Core Portfolio
Business Acquisition [Line Items]
Acquisition costs expensed										1,200,000
Fund Portfolio
Business Acquisition [Line Items]
Acquisition costs expensed										$ 900,000

Real Estate - Schedule of Purch

Real Estate - Schedule of Purchase Price Allocations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Purchase Price Allocation
Land	$ 38,086	$ 48,138
Buildings and improvements	129,586	173,576
Other assets	0	84
Acquisition-related intangible assets (Note 6)	26,693	44,269
Acquisition-related intangible liabilities (Note 6)	(7,902)	(11,535)
Net assets acquired	186,463	254,532
Consideration
Cash	147,985	200,429
Conversion of note receivable	0	41,010
Liabilities assumed	2,597	3,363
Existing interest in previously unconsolidated investment	35,881	4,159
Change in control of previously unconsolidated investment	0	5,571
Total Consideration	$ 186,463	$ 254,532

Real Estate - Schedule of Prope

Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale	$ 5,140	$ 48,886	$ 81,965
Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale Price	66,500	281,338
Gain (Loss) on Sale	$ 5,140	$ 48,886	$ 81,965
Fund II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Apr. 17, 2018
Fund II | Disposal Group, Not Discontinued Operations | Sherman Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Apr. 17, 2018
Sale Price	$ 26,000
Gain (Loss) on Sale	$ 33
Fund II | Disposal Group, Not Discontinued Operations | 216th Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Sep. 11, 2017
Sale Price		$ 30,579
Gain (Loss) on Sale		$ 6,543
Fund II | Disposal Group, Not Discontinued Operations | City Point Condominium Tower I
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Oct. 13, 2017
Sale Price		$ 96,000
Gain (Loss) on Sale		$ (810)
Fund II | Disposal Group, Not Discontinued Operations | 260 E 161th Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Dec. 13, 2017
Sale Price		$ 105,684
Gain (Loss) on Sale		$ 31,537
Fund IV | Disposal Group, Not Discontinued Operations | Lake Montclair
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Aug. 27, 2018
Sale Price	$ 22,450
Gain (Loss) on Sale	$ 2,923
Fund IV | Disposal Group, Not Discontinued Operations | 1861 Union Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Aug. 29, 2018
Sale Price	$ 6,000
Gain (Loss) on Sale	$ 2,184
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario One
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Nov. 30, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Two
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Dec. 10, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Three
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Dec. 17, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Four
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Dec. 21, 2018
Sale Price	$ 12,050
Fund IV | Disposal Group, Not Discontinued Operations | 1151 Third Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Nov. 16, 2017
Sale Price		$ 27,000
Gain (Loss) on Sale		$ 5,183
Fund III | Disposal Group, Not Discontinued Operations | New Hyde Park Shopping Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Jul. 6, 2017
Sale Price		$ 22,075
Gain (Loss) on Sale		$ 6,433

Real Estate - Schedule of Dispo

Real Estate - Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
STATEMENTS OF INCOME
Gain on disposition of properties	$ 5,140	$ 48,886	$ 81,965
Disposal Group, Not Discontinued Operations
STATEMENTS OF INCOME
Revenues	1,968	16,249	20,097
Expenses	(1,874)	(20,529)	(17,079)
Loss (income) from continuing operations of disposed properties before gain on disposition of properties	94	(4,280)	3,018
Gain on disposition of properties	5,140	48,886	81,965
Net income attributable to noncontrolling interests	(3,368)	(32,254)	(70,714)
Net income attributable to Acadia	$ 1,866	$ 12,352	$ 14,269

Real Estate - Properties Held f

Real Estate - Properties Held for Sale - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017USD ($)property	Sep. 30, 2017USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)property	Dec. 31, 2016USD ($)
Long Lived Assets Held-for-sale [Line Items]
Impairment charges	$ 10,600	$ 3,800	$ 0	$ 14,455	$ 0
Fund II
Long Lived Assets Held-for-sale [Line Items]
Number of properties held-for-sale | property	1			1
Properties held-for-sale	$ 25,400			$ 25,400
Date Sold			Apr. 17, 2018
Noncontrolling Interests
Long Lived Assets Held-for-sale [Line Items]
Impairment charges	$ 7,600	$ 2,700
Disposal group, held-for-sale
Long Lived Assets Held-for-sale [Line Items]
Properties held for sale net loss			$ 500	600
Impairment charges				10,600
Disposal group, held-for-sale | Noncontrolling Interests
Long Lived Assets Held-for-sale [Line Items]
Impairment charges				$ 7,600

Real Estate - Schedule of Devel

Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)property	Dec. 31, 2017USD ($)property
Property, Plant and Equipment [Line Items]
Number of properties under development | property	3	5
Real estate under development	$ 120,297	$ 173,702
Transfers In	0
Capitalized Costs	45,867
Transfers Out	$ 99,272
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of properties under development | property	1	2
Real estate under development	$ 7,759	$ 21,897
Transfers In	0
Capitalized Costs	6,320
Transfers Out	$ 20,458
Fund Portfolio | Fund II
Property, Plant and Equipment [Line Items]
Number of properties under development | property	0	0
Real estate under development	$ 7,462	$ 4,908
Transfers In	0
Capitalized Costs	2,554
Transfers Out	$ 0
Fund Portfolio | Fund III
Property, Plant and Equipment [Line Items]
Number of properties under development | property	1	2
Real estate under development	$ 21,242	$ 63,939
Transfers In	0
Capitalized Costs	36,117
Transfers Out	$ 78,814
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of properties under development | property	1	1
Real estate under development	$ 83,834	$ 82,958
Transfers In	0
Capitalized Costs	876
Transfers Out	$ 0

Real Estate - Real Estate Under

Real Estate - Real Estate Under Development and Construction in Progress - Additional Information (Details) - property	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Number of unconsolidated project in development	1
Number of properties under development	3	5
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of unconsolidated project in development		4
Number of projects put into service during period		3
Number of properties under development	1	1
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of projects put into service during period	1	1
Number of properties under development	1	2

Notes Receivable, Net - Schedul

Notes Receivable, Net - Schedule of Notes Receivable (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)debtinstrument	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 109,613	$ 153,829	$ 276,163	$ 147,188
Number of instruments held | debtinstrument	5
Core Portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 56,475	101,695
Number of instruments held | debtinstrument	2
Core Portfolio | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Maturity Date	2019-04
Effective interest rate	6.00%
Core Portfolio | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Maturity Date	2020-04
Effective interest rate	8.10%
Fund Portfolio | Fund II
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 32,582	31,778
Number of instruments held | debtinstrument	1
Maturity Date	2020-05
Effective interest rate	2.50%
Fund Portfolio | Fund III
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 5,306	5,106
Number of instruments held | debtinstrument	1
Maturity Date	2020-07
Effective interest rate	18.00%
Fund Portfolio | Fund IV
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Net carrying amount of notes receivable | $	$ 15,250	$ 15,250
Number of instruments held | debtinstrument	1
Maturity Date	2021-02
Effective interest rate	15.30%

Notes Receivable, Net - Additio

Notes Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Note receivable exchanged	$ 22,021	$ 101,705
Proceeds from notes receivable	26,000	32,000	$ 42,819
Additional advance	187,173	156,344	222,071
Recovered mortgage amount including accrued interest and fees		16,800
Notes receivable, net	109,613	153,829	$ 276,163	$ 147,188
Nonperforming Financial Instruments
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Proceeds from notes receivable		12,000
Fund III
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Additional advance	200	600
Fund II
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Note receivable accrued interest	800	800
Core Portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Note receivable accrued interest	200
Proceeds from notes receivable	26,000
Notes receivable, net	56,475	101,695
Core Portfolio | Note Receivable Due April 1, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Proceeds from notes receivable	15,000
Additional advance	2,800
Core Portfolio | Notes Receivable of $10 million
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Additional advance		10,000
Notes receivable, net		20,000
Core Portfolio | Note Receivable, Due June 1, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Notes receivable, net		15,000
Town Center | Core Portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Note receivable exchanged	22,000
Note receivable accrued interest	$ 300
Market Square and Town Center Properties | Core Portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Note receivable exchanged		92,700
Note receivable accrued interest		1,800
Shopping Center in Windham, ME
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Note receivable exchanged		9,000
Note receivable accrued interest		$ 100

Investments in and Advances t_3

Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 28, 2018	Dec. 31, 2017	Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ (461)		$ 2,415
Other	556		556
Investments in and advances to unconsolidated affiliates	262,410		302,070
Distributions in excess of income from, and investments in, unconsolidated affiliates	$ 15,623		15,292
KLA Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	10.50%
Equity method investments	$ 0		0
Fund III Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 21		167
Self Storage Management
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	95.00%
Equity method investments	$ 206		206
Fund III
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 227		373
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity method investments	$ 3,236		48,335
Fund IV Other Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 14,540		20,199
650 Bald Hill Road
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	90.00%
Equity method investments	$ 12,880		13,609
Fund IV
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 30,656		$ 82,143
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	75.22%		61.11%	22.22%
Equity method investments	$ 231,432	$ 22,300	$ 216,583	$ 61,600
Core Portfolio | 840 N. Michigan
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	88.43%
Equity method investments	$ 65,013		69,846
Core Portfolio | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	20.00%
Equity method investments	$ 32,458		35,041
Core Portfolio | Gotham Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Equity method investments	$ 29,550		29,416
Core Portfolio | Town Center
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	75.22%
Equity method investments	$ 99,758		78,801
Core Portfolio | Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity method investments	$ 4,653		3,479
Core Portfolio | Crossroads
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Distributions in excess of income from, and investments in, unconsolidated affiliates	$ 15,623		$ 15,292

Investments in and Advances t_4

Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
KLA Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 0	$ 0
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 3,236	48,335
Cumulative capital contribution, percentage	15.00%
Cumulative capital contribution	$ 3,000	15,400
Preferred return percentage	9.00%
Preferred return	$ 2,800	$ 41,200

Investments in and Advances t_5

Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) $ in Thousands	Mar. 28, 2018USD ($)	Nov. 16, 2017USD ($)	May 01, 2017USD ($)	Jan. 04, 2017USD ($)ft²	Apr. 29, 2016USD ($)	Dec. 31, 2018USD ($)ft²property	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Schedule of Equity Method Investments [Line Items]
Purchase Price						$ 186,463	$ 254,532
Note receivable exchanged						22,021	101,705
Notes receivable, net						109,613	153,829	$ 276,163	$ 147,188
Brandywine Portfolio
Schedule of Equity Method Investments [Line Items]
Preferred return						5,600
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Purchase Price						1,337	42,800
Notes receivable, net						56,475	$ 101,695
Note receivable accrued interest						$ 200
Equity method investment, ownership percentage by third party	14.11%	38.89%				24.78%
Equity method investment, ownership percentage		22.22%				75.22%	61.11%
Equity method investments	$ 22,300	$ 61,600				$ 231,432	$ 216,583
Gain on equity method investment	12,700	34,500
Core Portfolio | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Percentage of voting interests acquired				20.00%
Square footage of real estate property (in square feet) | ft²						213,000
Number of businesses acquired | property						18
Equity method investment, ownership percentage						20.00%
Equity method investments						$ 32,458	$ 35,041
Core Portfolio | Brandywine Portfolio
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (in square feet) | ft²						1,000,000
Repayments of debt					$ 140,000
Note receivable exchanged	22,000		$ 16,000
Notes receivable, net			153,400			$ 38,700
Note receivable accrued interest	$ 300		$ 300
Core Portfolio | Brandywine Portfolio | Exchange Transaction One
Schedule of Equity Method Investments [Line Items]
Note receivable exchanged		16,000
Note receivable accrued interest		600
Core Portfolio | Brandywine Portfolio | Exchange Transaction Two
Schedule of Equity Method Investments [Line Items]
Note receivable exchanged		60,700
Note receivable accrued interest		$ 900
Core Portfolio | Market Square
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage by third party		38.89%	38.89%
Equity method investment, ownership percentage		22.22%	61.11%
Equity method investments			$ 16,300
Gain on equity method investment			$ 9,800
Core Portfolio | Alexandria, Virginia | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (in square feet) | ft²				6,200
Purchase Price				$ 3,000
Number of businesses acquired | property						2
Core Portfolio | Washington D.C. | Renaissance Portfolio
Schedule of Equity Method Investments [Line Items]
Number of businesses acquired | property						16

Investments in and Advances t_6

Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details)

Aug. 29, 2018USD ($)property

Jun. 29, 2018USD ($)property

May 15, 2018USD ($)

Jan. 18, 2018USD ($)property

Jun. 30, 2017USD ($)

Feb. 15, 2017USD ($)

Jan. 31, 2017USD ($)

Sep. 30, 2018USD ($)property

Dec. 31, 2017USD ($)property

Dec. 21, 2017USD ($)property

Sep. 30, 2017USD ($)property

Jun. 30, 2017USD ($)

Mar. 31, 2017USD ($)property

Dec. 31, 2018USD ($)propertysegment

Dec. 31, 2017USD ($)property

Dec. 31, 2016USD ($)

Dec. 31, 2014propertyJointVenture

Oct. 31, 2018

Schedule of Equity Method Investments [Line Items]

Cost method investments

$ 556,000

$ 556,000

$ 556,000

Equity in earnings (losses) of unconsolidated affiliates

$ 9,302,000

23,371,000

$ 39,449,000

Number of retail properties | property

171

Proceeds from the disposition of properties, net

$ 63,866,000

260,711,000

150,378,000

Return of capital from unconsolidated affiliates and other

$ 26,338,000

$ 43,684,000

$ 79,030,000

Disposed of by sale

Schedule of Equity Method Investments [Line Items]

Number of retail properties | property

2

3

2

2

3

Gain (loss) on disposal

$ 5,100,000

$ 35,900,000

$ 13,000,000

$ 3,300,000

$ 14,500,000

Partnership Interest | Disposed of by sale

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

800,000

$ 2,700,000

Mervyns I and Mervyns II

Schedule of Equity Method Investments [Line Items]

Distribution from equity method investment

$ 1,100,000

Equity method investments

0

0

Albertson's

Schedule of Equity Method Investments [Line Items]

Cost method investment ownership interest

1.05%

Distribution from cost method investment

2,400,000

Cost method investments

0

0

Equity in earnings (losses) of unconsolidated affiliates

2,000,000

Fund III's Storage Post venture

Schedule of Equity Method Investments [Line Items]

Distribution from cost method investment

$ 3,200,000

Cost method investments

0

Fund III's Storage Post venture | Partnership Interest

Schedule of Equity Method Investments [Line Items]

Distribution from cost method investment

$ 800,000

BSP I and BSP II

Schedule of Equity Method Investments [Line Items]

Equity method investment, ownership percentage

50.00%

Number of Joint Ventures | JointVenture

2

Broughton St. Portfolio Savannah, GA

Schedule of Equity Method Investments [Line Items]

Equity method investments

48,335,000

$ 3,236,000

48,335,000

Equity method investment, ownership percentage

50.00%

Number of businesses acquired | property

23

Number of retail properties | property

13

Fund I Vs Broughton Street Portfolio Venture

Schedule of Equity Method Investments [Line Items]

Number of retail properties | property

2

8

Losses on cost method investments

$ 1,000,000

Fund I Vs Broughton Street Portfolio Venture | Partnership Interest | Maximum

Schedule of Equity Method Investments [Line Items]

Losses on cost method investments

$ 100,000

Fund IV

Schedule of Equity Method Investments [Line Items]

Equity method investments

82,143,000

$ 30,656,000

82,143,000

Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA

Schedule of Equity Method Investments [Line Items]

Number of retail properties | property

1

2

5

2

Proceeds from the disposition of properties, net

$ 2,000,000

$ 8,000,000

Gain (loss) on disposal

(300,000)

(400,000)

$ 1,200,000

Return of capital from unconsolidated affiliates and other

11,000,000

Fund IV | Disposed of by sale | 2819 Kennedy Boulevard

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 6,300,000

Consideration received

19,000,000

Return of capital from unconsolidated affiliates and other

10,600,000

Fund IV | Disposed of by sale | 2819 Kennedy Boulevard | Mortgages

Schedule of Equity Method Investments [Line Items]

Repayments of debt

8,400,000

Fund IV | Disposed of by sale | 1701 Belmont Avenue

Schedule of Equity Method Investments [Line Items]

Consideration received

$ 5,600,000

$ 5,600,000

Return of capital from unconsolidated affiliates and other

2,700,000

Fund IV | Disposed of by sale | 1701 Belmont Avenue | Mortgages

Schedule of Equity Method Investments [Line Items]

Repayments of debt

2,900,000

Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 0

100,000

Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Maximum

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ (100,000)

Fund IV | Partnership Interest | Disposed of by sale | 2819 Kennedy Boulevard

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

1,400,000

Fund IV | Consolidated Entity | Disposed of by sale | Broughton St. Portfolio Savannah, GA

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 600,000

Fund IV | Consolidated Entity | Disposed of by sale | 2819 Kennedy Boulevard

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 6,200,000

Fund IV | Consolidated Entity | Disposed of by sale | 1701 Belmont Avenue

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 3,300,000

BSP I

Schedule of Equity Method Investments [Line Items]

Equity method investment, ownership percentage

100.00%

BSP I | Consolidated Entity

Schedule of Equity Method Investments [Line Items]

Number of retail properties | segment

11

BSP II | Unconsolidated Affiliates

Schedule of Equity Method Investments [Line Items]

Number of retail properties | property

2

Fund III

Schedule of Equity Method Investments [Line Items]

Equity method investments

$ 373,000

$ 227,000

$ 373,000

Fund III | Disposed of by sale | Arundel Plaza

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 8,200,000

Consideration received

28,800,000

Return of capital from unconsolidated affiliates and other

18,800,000

Fund III | Disposed of by sale | Arundel Plaza | Mortgages

Schedule of Equity Method Investments [Line Items]

Repayments of debt

10,000,000

Fund III | Partnership Interest | Disposed of by sale | Arundel Plaza

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

1,300,000

Fund III | Consolidated Entity | Disposed of by sale | Arundel Plaza

Schedule of Equity Method Investments [Line Items]

Gain (loss) on disposal

$ 5,300,000

Investments in and Advances t_7

Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Additional Information (Details) - Equity Method Investee - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Related party revenue	$ 1.1	$ 1.3	$ 1.2
Expenses, related party	$ 2.2	$ 2	$ 2.4

Investments in and Advances t_8

Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Schedule of Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Combined and Condensed Balance Sheets
Real estate under development	$ 120,297	$ 173,702
Other assets	208,570	214,959
Total assets	3,958,780	3,960,247	$ 3,995,960
Total liabilities and equity	3,958,780	3,960,247
Company's share of distributions in excess of income from and investments in unconsolidated affiliates	15,623	15,292
Investments in and advances to unconsolidated affiliates	262,410	302,070
Unconsolidated Affiliates
Combined and Condensed Balance Sheets
Rental property, net	488,000	518,900
Real estate under development		26,681
Investment in unconsolidated affiliates	6,853	6,853
Other assets	91,497	100,901
Total assets	586,350	653,335
Mortgage notes payable	408,967	405,652
Other liabilities	54,675	61,932
Partners’ equity	122,708	185,751
Total liabilities and equity	586,350	653,335
Company's share of accumulated equity	141,384	185,533
Basis differential	104,084	95,358
Deferred fees, net of portion related to the Company's interest	1,780	3,472
Amounts (payable) receivable by the Company	(461)	2,415
Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates	246,787	286,778
Company's share of distributions in excess of income from and investments in unconsolidated affiliates	15,623	15,292
Investments in and advances to unconsolidated affiliates	$ 262,410	$ 302,070

Investments in and Advances t_9

Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Schedule of Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Combined and Condensed Statements of Income
Revenues	$ 69,445	$ 66,075	$ 63,569	$ 63,124	$ 66,081	$ 62,678	$ 59,504	$ 61,999	$ 262,213	$ 250,262	$ 189,939
Operating and other expenses									(234,672)	(232,943)	(168,050)
Depreciation and amortization									(117,549)	(104,934)	(70,011)
(Loss) income from continuing operations before gain on disposition of properties									(20,838)	15,422	52,627
Company’s equity in earnings of unconsolidated affiliates									9,302	23,371	39,449
Unconsolidated Affiliates
Combined and Condensed Statements of Income
Revenues									80,184	83,222	84,218
Operating and other expenses									(23,586)	(24,711)	(25,724)
Interest expense									(19,954)	(18,733)	(16,300)
Depreciation and amortization									(22,228)	(24,192)	(35,432)
Loss on debt extinguishment										(154)
(Loss) gain on disposition of properties									(1,673)	18,957	(1,340)
(Loss) income from continuing operations before gain on disposition of properties									12,743	34,389	5,422
Operating Partnership, as General Partner or Managing Member
Combined and Condensed Statements of Income
Company’s share of equity in net income of unconsolidated affiliates									12,345	26,039	40,538
Basis differential amortization									(3,043)	(2,668)	(1,089)
Company’s equity in earnings of unconsolidated affiliates									$ 9,302	$ 23,371	$ 39,449

Other Assets, Net and Account_3

Other Assets, Net and Accounts Payable and Other Liabilities - Schedule of other assets and other liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets, Net:
Lease intangibles, net (Note 6)	$ 115,939	$ 127,571
Deferred charges, net	28,619	24,589
Prepaid expenses	18,422	16,838
Other receivables	5,058	11,356
Accrued interest receivable	17,046	11,668
Deposits	4,611	6,296
Due from seller	4,000	4,300
Deferred tax assets	2,032	2,096
Derivative financial instruments (Note 8)	7,018	4,402
Due from related parties	1,802	1,479
Corporate assets	1,953	2,369
Income taxes receivable	2,070	1,995
Other assets, net	208,570	214,959
Deferred Charges, Net:
Deferred leasing and other costs	45,011	41,020
Deferred financing costs related to line of credit	8,960	7,786
Deferred costs, gross	53,971	48,806
Accumulated amortization	(25,352)	(24,217)
Deferred charges, net	28,619	24,589
Accounts Payable and Other Liabilities:
Lease intangibles, net (Note 6)	95,045	104,478
Accounts payable and accrued expenses	65,215	61,420
Deferred income	34,052	31,306
Tenant security deposits, escrow and other	10,588	10,029
Derivative financial instruments (Note 8)	7,304	1,467
Income taxes payable	19	176
Other	2,738	1,176
Accounts payable and other liabilities	$ 214,961	$ 210,052

Lease Intangibles - Schedule of

Lease Intangibles - Schedule of Intangible Assets and Liabilities Included in Other Assets and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 234,190	$ 210,607
Amortizable Intangible Assets, Accumulated Amortization	(118,251)	(83,036)
Amortizable Intangible Assets, Net Carrying Amount	115,939	127,571
Amortizable Intangible Liabilities
Amortizable Intangible Liabilities, Gross Carrying Amount	(152,188)	(147,232)
Amortizable Intangible Liabilities, Accumulated Amortization	57,721	43,391
Amortizable Intangible Liabilities, Net Carrying Amount	(94,467)	(103,841)
Above-market Ground Lease, Gross	(671)	(671)
Above-market Ground Lease, Accumulated Amortization	93	34
Above-market Ground Lease, Net	(578)	(637)
Finite-Lived Intangible Liabilities, Gross	(152,859)	(147,903)
Finite-Lived Intangible Liabilities, Accumulated Amortization	57,814	43,425
Finite-Lived Intangible Liabilities, Net	(95,045)	(104,478)
In-place lease intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	216,021	193,821
Amortizable Intangible Assets, Accumulated Amortization	(105,972)	(72,749)
Amortizable Intangible Assets, Net Carrying Amount	110,049	121,072
Amortizable Intangible Liabilities
Amortizable Intangible Liabilities, Net Carrying Amount	(88,577)
Above-market rent
Finite-Lived Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	18,169	16,786
Amortizable Intangible Assets, Accumulated Amortization	(12,279)	(10,287)
Amortizable Intangible Assets, Net Carrying Amount	$ 5,890	$ 6,499

Lease Intangibles - Additional

Lease Intangibles - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Below market rents, acquired	$ 7.9	$ 10.9
Below market rents acquired, weighted average useful life	20 years 6 months	12 years 1 month 6 days
Above-market ground lease, acquired		$ 0.7
Above-market ground lease acquired, weighted average useful life		11 years 6 months
In-place lease intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 24.2	$ 41.6
Acquired intangible assets, weighted average useful life	4 years 3 months 18 days	4 years 1 month 6 days
Above-market rent
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 2.5	$ 2.7
Acquired intangible assets, weighted average useful life	1 year 8 months 12 days	4 years 9 months 18 days

Lease Intangibles - Scheduled A

Lease Intangibles - Scheduled Amortization of Acquired Lease Intangible Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquired Lease Intangibles [Abstract]
Net Increase In Lease Revenues, Total	$ 94,467	$ 103,841
Amortizable Intangible Assets, Net Carrying Amount	(115,939)	(127,571)
In-place lease intangible assets
Acquired Lease Intangibles [Abstract]
2019, Net Increase In Lease Revenues	8,431
2020, Net Increase In Lease Revenues	8,206
2021, Net Increase In Lease Revenues	7,725
2022, Net Increase In Lease Revenues	7,346
2023, Net Increase In Lease Revenues	7,053
Thereafter, Net Increase In Lease Revenues	49,816
Net Increase In Lease Revenues, Total	88,577
2019, Increase to Amortization	(27,309)
2020, Increase to Amortization	(20,511)
2021, Increase to Amortization	(15,196)
2022, Increase to Amortization	(10,467)
2023, Increase to Amortization	(8,192)
Thereafter, Increase to Amortization	(28,374)
Amortizable Intangible Assets, Net Carrying Amount	(110,049)	$ (121,072)
2019, Reduction of Rent Expense	58
2020, Reduction of Rent Expense	58
2021, Reduction of Rent Expense	58
2022, Reduction of Rent Expense	58
2023, Reduction of Rent Expense	58
Thereafter, Reduction of Rent Expense	288
Reduction of Rent Expense, Total	578
2019, Net Income (Expense)	(18,820)
2020, Net Income (Expense)	(12,247)
2021, Net Income (Expense)	(7,413)
2022, Net Income (Expense)	(3,063)
2023, Net Income (Expense)	(1,081)
Thereafter, Net Income (Expense)	21,730
Total, Net Income (Expense)	$ (20,894)

Debt - Summary of Consolidated

Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,560,333	$ 1,438,386
Net unamortized debt issuance costs	(10,541)	(14,833)
Unamortized fair market value of assumed debt	753	856
Mortgage and other notes payable, net	1,017,288	909,174
Unsecured notes payable, net	533,257	473,735
Unsecured line of credit	0	41,500
Total Indebtedness	1,550,545	1,424,409
Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	1,001,658	899,650
Total Debt - Variable Rate
Debt Instrument [Line Items]
Long-term debt, gross	558,675	538,736
Mortgages
Debt Instrument [Line Items]
Net unamortized debt issuance costs	(10,173)	(12,943)
Unamortized fair market value of assumed debt	753	856
Mortgage and other notes payable, net	1,017,288	909,174
Unsecured Debt
Debt Instrument [Line Items]
Net unamortized debt issuance costs	(368)	(1,890)
Unsecured notes payable, net	$ 533,257	473,735
Line of Credit
Debt Instrument [Line Items]
Unsecured line of credit		41,500
Core Portfolio | Minimum
Debt Instrument [Line Items]
Maturity Date	2019-04
Core Portfolio | Maximum
Debt Instrument [Line Items]
Maturity Date	2020-04
Core Portfolio | Variable Rate Debt | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Core Portfolio | Variable Rate Debt | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Core Portfolio | Unsecured Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Core Portfolio | Unsecured Notes Payable | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Core Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 260,854	254,022
Core Portfolio | Mortgages | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Core Portfolio | Mortgages | Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 178,271	$ 179,870
Core Portfolio | Mortgages | Fixed Rate | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.88%	3.88%
Maturity Date	2024-02
Core Portfolio | Mortgages | Fixed Rate | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	6.00%	5.89%
Maturity Date	2035-04
Core Portfolio | Mortgages | Variable Rate - Swapped
Debt Instrument [Line Items]
Long-term debt, gross	$ 82,583	$ 74,152
Core Portfolio | Mortgages | Variable Rate - Swapped | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.41%	3.41%
Maturity Date	2023-01
Core Portfolio | Mortgages | Variable Rate - Swapped | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	5.67%	5.67%
Maturity Date	2026-06
Core Portfolio | Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000	$ 300,000
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped
Debt Instrument [Line Items]
Maturity Date	2023-03
Long-term debt, gross	$ 349,617	$ 300,000
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	2.49%	2.54%
Core Portfolio | Unsecured Debt | Variable Rate Unsecured Term Loans - Swapped | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.05%	3.59%
Core Portfolio | Unsecured Debt | Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 383
Core Portfolio | Unsecured Debt | Term Loans | LIBOR
Debt Instrument [Line Items]
Interest rate, stated percentage	1.25%
Maturity Date	2023-03
Core Portfolio | Line of Credit | Unsecured Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 18,048
Core Portfolio | Line of Credit | Unsecured Line of Credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%	1.40%
Maturity Date	2022-03
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped
Debt Instrument [Line Items]
Maturity Date	2022-03
Long-term debt, gross		$ 23,452
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | LIBOR | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.15%	4.20%
Core Portfolio | Line of Credit | Unsecured Line of Credit - Swapped | LIBOR | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	5.02%	5.07%
Fund II | Fund Portfolio
Debt Instrument [Line Items]
Maturity Date	2020-05
Fund II | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.39%
Fund II | Fund Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 224,587	$ 224,822
Fund II | Fund Portfolio | Mortgages | Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 205,262	$ 205,262
Fund II | Fund Portfolio | Mortgages | Fixed Rate | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	1.00%	1.00%
Maturity Date	2020-05
Fund II | Fund Portfolio | Mortgages | Fixed Rate | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%	4.75%
Maturity Date	2042-08
Fund II | Fund Portfolio | Mortgages | Variable Rate - Swapped
Debt Instrument [Line Items]
Interest rate, stated percentage	4.27%	4.27%
Maturity Date	2021-11
Long-term debt, gross	$ 19,325	$ 19,560
Fund II | Fund Portfolio | Unsecured Debt | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%	1.40%
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable
Debt Instrument [Line Items]
Long-term debt, gross	$ 40,000	$ 31,500
Fund II | Fund Portfolio | Unsecured Debt | Unsecured Notes Payable | LIBOR
Debt Instrument [Line Items]
Maturity Date	2020-09
Fund III | Fund Portfolio
Debt Instrument [Line Items]
Maturity Date	2020-07
Fund III | Fund Portfolio | Variable Rate Debt | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.65%
Fund III | Fund Portfolio | Variable Rate Debt | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.65%
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 90,096	$ 65,866
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.65%
Maturity Date	2020-06
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.65%	4.65%
Maturity Date	2021-12
Fund III | Fund Portfolio | Mortgages | Variable Rate Debt | Prime Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Fund IV | Fund Portfolio
Debt Instrument [Line Items]
Maturity Date	2021-02
Fund IV | Fund Portfolio | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Fund IV | Fund Portfolio | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.95%
Fund IV | Fund Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 313,095	$ 347,938
Fund IV | Fund Portfolio | Mortgages | Fixed Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,189	$ 10,503
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	3.40%	3.40%
Maturity Date	2025-10
Fund IV | Fund Portfolio | Mortgages | Fixed Rate | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%	4.50%
Maturity Date	2026-06
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped
Debt Instrument [Line Items]
Long-term debt, gross	$ 71,841	$ 86,851
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum
Debt Instrument [Line Items]
Maturity Date	2019-05
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum
Debt Instrument [Line Items]
Maturity Date	2022-12
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	3.67%	3.67%
Fund IV | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.23%	4.23%
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 233,065	$ 250,584
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%	1.70%
Maturity Date	2019-02
Fund IV | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.95%	3.95%
Maturity Date	2021-08
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan / Subscription Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 40,825	$ 40,825
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan / Subscription Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%	1.65%
Maturity Date	2019-10
Fund IV | Fund Portfolio | Unsecured Debt | Term Loan / Subscription Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%	2.75%
Maturity Date	2019-12
Fund V | Fund Portfolio | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.15%
Fund V | Fund Portfolio | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Fund V | Fund Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 138,076	$ 28,613
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped
Debt Instrument [Line Items]
Long-term debt, gross	$ 86,570	0
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Minimum
Debt Instrument [Line Items]
Maturity Date	2021-02
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | Maximum
Debt Instrument [Line Items]
Maturity Date	2021-06
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	4.61%
Fund V | Fund Portfolio | Mortgages | Variable Rate - Swapped | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.78%
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 51,506	$ 28,613
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.15%
Maturity Date	2020-10
Fund V | Fund Portfolio | Mortgages | Variable Rate Debt | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Maturity Date	2021-01
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line
Debt Instrument [Line Items]
Long-term debt, gross	$ 102,800	$ 103,300
Fund V | Fund Portfolio | Unsecured Debt | Subscription Line | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%	1.60%
Maturity Date	2020-05

Debt - Summary of Consolidate_2

Debt - Summary of Consolidated Indebtedness (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,560,333	$ 1,438,386
Variable-rate debt that subject to interest cap agreements
Debt Instrument [Line Items]
Long-term debt, gross	143,800	141,100
Total Debt - Variable Rate Debt Fixed with Interest Rate Swap Agreements
Debt Instrument [Line Items]
Long-term debt, gross	$ 609,900	$ 504,000
Minimum | Core Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Minimum | Core Portfolio | Unsecured Notes Payable | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Minimum | Core Portfolio | Unsecured Line of Credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Maximum | Core Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Fund II | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.39%
Fund III | Minimum | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.65%
Fund III | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	4.65%
Fund IV | Minimum | Fund Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Fund IV | Maximum | Fund Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.95%
Fund V | Minimum | Fund Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.15%
Fund V | Maximum | Fund Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%

Debt - Credit Facility - Additi

Debt - Credit Facility - Additional Information (Details) - USD ($)	Feb. 20, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Unsecured Debt
Debt Instrument [Line Items]
Maturity date	Mar. 31, 2023
Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150,000,000
Basis spread on variable rate	1.35%
Maturity date	Mar. 31, 2022
Unsecured Debt | Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000
Unsecured Debt | $300 Million Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000
Basis spread on variable rate	1.25%
Unsecured Debt | $150 Million Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150,000,000
Other Secured Financings
Debt Instrument [Line Items]
Maximum borrowing capacity	40,400,000
Core Portfolio | Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	150,000,000	$ 150,000,000
Core Portfolio | Unsecured Debt | $150 Million Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150,000,000

Debt - Mortgage Payable - Addit

Debt - Mortgage Payable - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018USD ($)propertyloanderivative	Dec. 31, 2017USD ($)property
Debt Instrument [Line Items]
Amount drawn on loan	$ 1,017,288,000	$ 909,174,000
Derivative, notional amount	69,670,000
Unsecured line of credit	0	41,500,000
Mortgages
Debt Instrument [Line Items]
Amount drawn on loan	$ 1,017,288,000	$ 909,174,000
Number of properties collateralized | property	43	42
Interest Rate Swaps
Debt Instrument [Line Items]
Derivative, notional amount	$ 50,000,000
Derivative fixed interest rate	2.80%
Interest Rate Swaps | Mortgages
Debt Instrument [Line Items]
Number of interest rate derivatives held | derivative	4
Derivative, notional amount	$ 136,600,000
Derivative fixed interest rate	2.86%
Fund V | Mortgages
Debt Instrument [Line Items]
Number of mortgage loans | loan	4
Borrowings, amount	$ 109,500,000
Core Portfolio
Debt Instrument [Line Items]
Derivative, notional amount	432,200,000
Core Portfolio | Maturing In 2028
Debt Instrument [Line Items]
Amount drawn on loan	$ 50,000,000
Core Portfolio | Mortgages
Debt Instrument [Line Items]
Number of notes repaid | loan	1
Repayments of debt	$ 40,400,000
Scheduled principal payment	6,700,000
Core Portfolio | Mortgages | Brandywine Portfolio
Debt Instrument [Line Items]
Debt default, amount	$ 26,300,000	$ 26,300,000
Interest rate, stated percentage	6.00%
Debt default interest	5.00%
Interest owner percentage in property	22.00%
Core Portfolio | Mortgages | Maturing In 2028
Debt Instrument [Line Items]
Borrowings, amount	$ 73,500,000
Fund III | Construction Loans
Debt Instrument [Line Items]
Unsecured line of credit	$ 24,600,000
Fund IV | Mortgages
Debt Instrument [Line Items]
Number of notes repaid | loan	3
Fund IV | Mortgages One
Debt Instrument [Line Items]
Repayments of debt	$ 27,200,000
LIBOR | Fund V | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate	1.99%
LIBOR | Core Portfolio | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
LIBOR | Core Portfolio | Mortgages | Maturing In 2028
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
LIBOR | Fund IV | Mortgages One
Debt Instrument [Line Items]
Basis spread on variable rate	2.81%

Debt - Unsecured Notes Payable

Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($)	Feb. 20, 2018	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Long-term debt outstanding		$ 1,560,333,000	$ 1,438,386,000
Derivative, notional amount		69,670,000
Letters of credit, outstanding amount		19,700,000	19,700,000
Core Portfolio
Debt Instrument [Line Items]
Derivative, notional amount		432,200,000
Fund Portfolio | Fund II
Debt Instrument [Line Items]
Derivative, notional amount		19,325,000
Fund Portfolio | Fund IV
Debt Instrument [Line Items]
Derivative, notional amount		180,741,000
Fund Portfolio | Fund V
Debt Instrument [Line Items]
Derivative, notional amount		86,570,000
Interest Rate Swaps
Debt Instrument [Line Items]
Derivative, notional amount		$ 50,000,000
Derivative fixed interest rate		2.80%
Unsecured Debt | Fund IV | Letter of Credit
Debt Instrument [Line Items]
Letters of credit, outstanding amount		$ 7,400,000	7,400,000
Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Long-term debt outstanding		350,000,000	300,000,000
Unsecured Notes Payable | Unsecured Debt
Debt Instrument [Line Items]
Debt available balance		62,300,000	70,300,000
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II
Debt Instrument [Line Items]
Long-term debt outstanding		40,000,000	31,500,000
$300 Million Term Loan | Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Maximum borrowing capacity	300,000,000
$350 Million Term Loan | Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000
Long-term debt outstanding		350,000,000	300,000,000
$350 Million Term Loan | Unsecured Debt | Core Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Term Loan Maturing In September 2020 | Secured Debt | Fund II
Debt Instrument [Line Items]
Maximum borrowing capacity		40,000,000
Long-term line of credit, noncurrent		40,000,000	31,500,000
Remaining borrowing capacity		0	8,500,000
Bridge facility | Unsecured Debt | Fund IV
Debt Instrument [Line Items]
Maximum borrowing capacity		41,800,000
Long-term line of credit, noncurrent		40,800,000	40,800,000
Remaining borrowing capacity		1,000,000	1,000,000
Subscription Line | Unsecured Debt | Fund IV
Debt Instrument [Line Items]
Maximum borrowing capacity		21,500,000
Long-term line of credit, noncurrent		0	0
Remaining borrowing capacity		14,100,000	14,100,000
Subscription Line | Unsecured Debt | Fund V
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000
Long-term line of credit, noncurrent		102,800,000
Remaining borrowing capacity		47,200,000
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V
Debt Instrument [Line Items]
Long-term debt outstanding		$ 102,800,000	103,300,000
Remaining borrowing capacity			$ 46,700,000
Subscription Line | Unsecured Debt | Fund Portfolio | LIBOR | Fund V
Debt Instrument [Line Items]
Basis spread on variable rate		1.60%	1.60%

Debt - Unsecured Revolving Line

Debt - Unsecured Revolving Lines of Credit - Additional Information (Details) - USD ($)	Dec. 31, 2018	Feb. 20, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 300,000,000
Letters of credit, outstanding amount	$ 19,700,000		$ 19,700,000
Revolving Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000
Core Portfolio | Revolving Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Debt available balance	137,700,000		96,200,000
Maximum borrowing capacity	150,000,000	$ 150,000,000
Credit facility amount outstanding	0		41,500,000
Letters of credit, outstanding amount	$ 12,300,000		$ 12,300,000

Debt - Scheduled Principal Repa

Debt - Scheduled Principal Repayments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2,019	$ 219,118
2,020	527,304
2,021	180,511
2,022	48,528
2,023	370,680
Thereafter	214,192
Long-term debt and convertible notes payable	1,560,333	$ 1,438,386
Unamortized premium	753	856
Net unamortized debt issuance costs	(10,541)	(14,833)
Total Indebtedness	$ 1,550,545	$ 1,424,409

Financial Instruments and Fai_3

Financial Instruments and Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Derivative financial instruments	$ 7,018	$ 4,402
Liabilities
Derivative financial instruments	7,304	1,467
Recurring | Level 1
Assets
Money Market Funds	4,504	3
Derivative financial instruments	0	0
Liabilities
Derivative financial instruments	0	0
Recurring | Level 2
Assets
Money Market Funds	0	0
Derivative financial instruments	7,018	4,402
Liabilities
Derivative financial instruments	7,304	1,467
Recurring | Level 3
Assets
Money Market Funds	0	0
Derivative financial instruments	0	0
Liabilities
Derivative financial instruments	$ 0	$ 0

Financial Instruments and Fai_4

Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges	$ 10,600,000	$ 3,800,000	$ 0	$ 14,455,000	$ 0
Reclassification adjustment related to derivatives from AOCI to interest expense			2,300,000
Derivatives designated as fair value hedges	0		0	0
Derivative designated to hedges of net investments in foreign operations	0		$ 0	0
Noncontrolling Interests
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges	$ 7,600,000	$ 2,700,000
Disposal group, held-for-sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges				10,600,000
Disposal group, held-for-sale | Noncontrolling Interests
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges				7,600,000
Nonrecurring | Disposal group, held-for-sale | Property Classified As Held For Sale At September 30, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges				3,800,000
Nonrecurring | Disposal group, held-for-sale | Property Classified As Held For Sale At December 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges				10,600,000
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Property Classified As Held For Sale At September 30, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges				2,700,000
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Property Classified As Held For Sale At December 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment charges				$ 7,600,000

Financial Instruments and Fai_5

Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 69,670
Derivative Effective Date	2018-06
Fair value, liability derivatives	$ (7,304)		$ (1,467)
Fair value, asset derivatives	$ 7,018		4,402
Minimum
Derivatives, Fair Value [Line Items]
Derivative Maturity Date	2021-06
Strike Rate	2.78%
Maximum
Derivatives, Fair Value [Line Items]
Derivative Maturity Date	2023-06
Strike Rate	2.88%
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 50,000
Derivative Effective Date	2020-07
Fair value, liability derivatives		$ (2,900)
Core Portfolio
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 432,200
Fair value, derivatives, net	(310)		2,638
Core Portfolio | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	111,117
Fair value, liability derivatives	(6,332)		(1,438)
Core Portfolio | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	321,083
Fair value, asset derivatives	$ 6,022		4,076
Core Portfolio | Interest Rate Swaps | Minimum | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2012-12
Derivative Maturity Date	2022-12
Strike Rate	2.80%
Core Portfolio | Interest Rate Swaps | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2013-02
Derivative Maturity Date	2019-11
Strike Rate	1.24%
Core Portfolio | Interest Rate Swaps | Maximum | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2020-07
Derivative Maturity Date	2030-07
Strike Rate	3.77%
Core Portfolio | Interest Rate Swaps | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2017-12
Derivative Maturity Date	2027-07
Strike Rate	3.77%
Fund Portfolio | Fund II
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 19,325
Fair value, derivatives, net	108		(29)
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 0
Derivative Effective Date	2014-10
Derivative Maturity Date	2021-11
Fair value, liability derivatives	$ 0		(29)
Fund Portfolio | Fund II | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 19,325
Derivative Effective Date	2014-10
Derivative Maturity Date	2021-11
Fair value, asset derivatives	$ 108		0
Fund Portfolio | Fund II | Interest Rate Swaps | Minimum | Other Liabilities
Derivatives, Fair Value [Line Items]
Strike Rate	2.88%
Fund Portfolio | Fund II | Interest Rate Swaps | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	2.88%
Fund Portfolio | Fund II | Interest Rate Swaps | Maximum | Other Liabilities
Derivatives, Fair Value [Line Items]
Strike Rate	2.88%
Fund Portfolio | Fund II | Interest Rate Swaps | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	2.88%
Fund Portfolio | Fund III | Interest Rate Cap | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 58,000
Derivative Effective Date	2016-12
Derivative Maturity Date	2020-01
Fair value, asset derivatives	$ 8		14
Fund Portfolio | Fund III | Interest Rate Cap | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.00%
Fund Portfolio | Fund III | Interest Rate Cap | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	3.00%
Fund Portfolio | Fund IV
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 180,741
Fair value, derivatives, net	859		312
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	71,841
Fair value, asset derivatives	$ 851		295
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2017-03
Derivative Maturity Date	2020-03
Strike Rate	1.82%
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2017-11
Derivative Maturity Date	2022-12
Strike Rate	2.11%
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 108,900
Fair value, asset derivatives	$ 8		17
Fund Portfolio | Fund IV | Interest Rate Cap | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2016-07
Derivative Maturity Date	2019-08
Strike Rate	3.00%
Fund Portfolio | Fund IV | Interest Rate Cap | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2016-11
Derivative Maturity Date	2019-12
Strike Rate	3.00%
Fund Portfolio | Fund V
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 86,570
Fair value, derivatives, net	(951)		0
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	(972)		0
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 16,900
Derivative Effective Date	2018-01
Derivative Maturity Date	2021-02
Fair value, asset derivatives	$ 21		$ 0
Fund Portfolio | Fund V | Interest Rate Swaps | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	2.41%
Fund Portfolio | Fund V | Interest Rate Swaps | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Strike Rate	2.41%

Financial Instruments and Fai_6

Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Parenthetical) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Jul. 31, 2018USD ($)derivative	Dec. 31, 2017USD ($)
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ (7,304)		$ (1,467)
Derivative Effective Date	2018-06
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Number of derivative instruments held | derivative		2
Fair value, liability derivatives		$ (2,900)
Derivative Effective Date	2020-07

Financial Instruments and Fai_7

Financial Instruments and Fair Value Measurements - Financial statements of Income (Losses) Recognized Related to Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) income recognized in other comprehensive income	$ (2,659)	$ 634	$ (646)
Amount of loss subsequently reclassified to earnings	$ 71	$ 3,317	$ 4,576

Financial Instruments and Fai_8

Financial Instruments and Fair Value Measurements - Schedule of Other Financial Instruments Carrying Values and Fair values (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable	$ 109,613	$ 153,829	$ 276,163	$ 147,188
Mortgage and Other Notes Payable	1,550,545	1,424,409
Unsecured notes payable and Unsecured line of credit	533,257	473,735
Level 3 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable	109,613	153,829
Mortgage and Other Notes Payable	1,026,708	921,261
Investment in non-traded equity securities	0	0
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable	107,370	151,712
Mortgage and Other Notes Payable	1,021,075	921,891
Investment in non-traded equity securities	23,208	22,824
Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured notes payable and Unsecured line of credit	533,625	517,125
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured notes payable and Unsecured line of credit	$ 533,954	$ 515,330

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Contractual obligation	$ 55.5	$ 98.7
Letters of credit, outstanding amount	$ 19.7	$ 19.7

Shareholders' Equity, Noncont_3

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Common Shares and Units - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 10, 2017	May 09, 2017
Class of Stock [Line Items]
Common shares, authorized (in shares)	200,000,000	200,000,000	200,000,000	100,000,000
Restricted shares
Class of Stock [Line Items]
Restricted stock, shares canceled for tax withholding for share based compensation (in shares)	3,288	4,314
LTIP Units and Restricted Stock
Class of Stock [Line Items]
Unit based compensation	$ 8.4	$ 8.4

Shareholders' Equity, Noncont_4

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Share Repurchases - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract]
Authorized amount	$ 200,000,000
Number of shares repurchased during period (in shares)	2,294,235	0
Shares repurchased during period	$ 55,111,000
Stock repurchase fees	100,000
Remaining authorized repurchase amount	$ 144,900,000

Shareholders' Equity, Noncont_5

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Dividends and Distributions - Additional Information (Details) - $ / shares

Nov. 13, 2018

Aug. 07, 2018

May 11, 2018

Feb. 27, 2018

Nov. 08, 2017

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Class of Stock [Line Items]

Cash dividends declared per common share (in dollars per share)

$ 0.28

$ 0.27

$ 0.27

$ 0.27

$ 0.27

$ 0.26

$ 0.26

$ 0.26

$ 1.09

$ 1.05

$ 1.16

Regular Quarterly Cash Dividend

Class of Stock [Line Items]

Cash dividends declared, period increase (in dollars per share)

$ 0.01

$ 0.01

Cash dividends declared per common share (in dollars per share)

$ 0.28

$ 0.27

$ 0.27

$ 0.27

$ 0.27

Fourth Quarter Two Thousand Eighteen

Class of Stock [Line Items]

Cash dividends, declared date

Nov. 13, 2018

Cash dividends, record date

Dec. 31, 2018

Cash dividends, paid date

Jan. 15, 2019

Third Quarter Two Thousand Eighteen

Class of Stock [Line Items]

Cash dividends, declared date

Aug. 7, 2018

Cash dividends, record date

Sep. 28, 2018

Cash dividends, paid date

Oct. 15, 2018

Second Quarter Two Thousand Eighteen

Class of Stock [Line Items]

Cash dividends, declared date

May 11, 2018

Cash dividends, record date

Jun. 29, 2018

Cash dividends, paid date

Jul. 13, 2018

First Quarter Two Thousand Eighteen

Class of Stock [Line Items]

Cash dividends, declared date

Feb. 27, 2018

Cash dividends, record date

Mar. 30, 2018

Cash dividends, paid date

Apr. 13, 2018

Fourth Quarter Two Thousand Seventeen

Class of Stock [Line Items]

Cash dividends, declared date

Nov. 8, 2017

Cash dividends, record date

Dec. 29, 2017

Cash dividends, paid date

Jan. 13, 2018

Shareholders' Equity, Noncont_6

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Activity in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 2,215,639	$ 2,178,125	$ 1,521,354
Other comprehensive (loss) income before reclassifications	(2,659)	634	(646)
Reclassification of realized interest on swap agreements	71	3,317	4,576
Net current period other comprehensive (loss) income	(2,588)	3,951	3,930
Ending Balance	2,081,947	2,215,639	2,178,125
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	2,614	(798)	(4,463)
Ending Balance	516	2,614	(798)
AOCI Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net current period other comprehensive (loss) income	$ 490	$ (539)	$ (265)

Shareholders' Equity, Noncont_7

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Change in Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ 648,440					$ 648,440
Net income (loss)	$ (6,671)	$ (2,597)	$ (2,270)	(4,160)	$ 24,944	$ 13,285	$ 6,108	$ 19,971	(15,698)	$ 64,308	$ 134,592
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership									0	0	0
Issuance of Common and Preferred OP Units to acquire real estate											31,429
Acquisition of noncontrolling interest											(18,379)
Other comprehensive loss - unrealized loss on valuation of swap agreements									(2,659)	634	(646)
Change in control of previously unconsolidated investment											(75,713)
Reclassification of realized interest on swap agreements									71	3,317	4,576
Noncontrolling interest contributions									47,560	85,206	295,108
Noncontrolling interest distributions									(24,793)	(32,805)	(80,769)
Employee Long-term Incentive Plan Unit Awards									12,948	11,155	13,694
Rebalancing adjustment									0	0	0
Ending Balance	622,442				648,440				622,442	648,440
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				648,440				589,548	648,440	589,548	420,866
Distributions declared of $1.09,1.05 and $1.16 per Common OP Unit for year ended 2018,2017 and 2016, respectively									(6,888)	(6,453)	(6,753)
Net income (loss)									(47,137)	2,838	61,816
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership									(2,068)	(1,541)	(7,892)
Issuance of Common and Preferred OP Units to acquire real estate											31,429
Acquisition of noncontrolling interest											(25,925)
Other comprehensive loss - unrealized loss on valuation of swap agreements									(810)	(147)	(332)
Change in control of previously unconsolidated investment											(75,713)
Reclassification of realized interest on swap agreements									320	686	597
Noncontrolling interest contributions									47,560	85,206	295,108
Noncontrolling interest distributions									(24,793)	(32,805)	(80,769)
Employee Long-term Incentive Plan Unit Awards									12,374	10,457	12,768
Rebalancing adjustment									(4,556)	651	(35,652)
Ending Balance	622,442				648,440				622,442	648,440	589,548
Noncontrolling Interests | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	(4,556)								(4,556)
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				545,519				494,126	545,519	494,126	324,526
Distributions declared of $1.09,1.05 and $1.16 per Common OP Unit for year ended 2018,2017 and 2016, respectively									0	0	0
Net income (loss)									(49,709)	(1,321)	56,814
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership									0	0	0
Issuance of Common and Preferred OP Units to acquire real estate											0
Acquisition of noncontrolling interest											(25,925)
Other comprehensive loss - unrealized loss on valuation of swap agreements									(681)	(232)	(289)
Change in control of previously unconsolidated investment											(75,713)
Reclassification of realized interest on swap agreements									323	545	374
Noncontrolling interest contributions									47,560	85,206	295,108
Noncontrolling interest distributions									(24,793)	(32,805)	(80,769)
Employee Long-term Incentive Plan Unit Awards									0	0	0
Rebalancing adjustment											0
Ending Balance	518,219				545,519				518,219	545,519	494,126
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	0								0
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance				$ 102,921				$ 95,422	102,921	95,422	96,340
Distributions declared of $1.09,1.05 and $1.16 per Common OP Unit for year ended 2018,2017 and 2016, respectively									(6,888)	(6,453)	(6,753)
Net income (loss)									2,572	4,159	5,002
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership									(2,068)	(1,541)	(7,892)
Issuance of Common and Preferred OP Units to acquire real estate											31,429
Acquisition of noncontrolling interest											0
Other comprehensive loss - unrealized loss on valuation of swap agreements									(129)	85	(43)
Change in control of previously unconsolidated investment											0
Reclassification of realized interest on swap agreements									(3)	141	223
Noncontrolling interest contributions									0	0	0
Noncontrolling interest distributions									0	0	0
Employee Long-term Incentive Plan Unit Awards									12,374	10,457	12,768
Rebalancing adjustment									(4,556)	651	(35,652)
Ending Balance	104,223				$ 102,921				104,223	$ 102,921	$ 95,422
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending Balance	$ (4,556)								$ (4,556)

Shareholders' Equity, Noncont_8

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Summary of Change in Noncontrolling Interest (Parenthetical) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Minority Interest [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership (in shares)	117,978				81,453				117,978	81,453	351,250
Preferred shares converted to common stock (in shares)					5,000					5,000
Operating Partnership, as General Partner or Managing Member
Minority Interest [Line Items]
Series A Preferred OP Units (in shares)	3,329,640				3,328,873				3,329,640	3,328,873	3,308,875
Operating Partnership, as General Partner or Managing Member | Series A Preferred Stock
Minority Interest [Line Items]
Series A Preferred OP Units (in shares)	188				188				188	188	188
Operating Partnership, as General Partner or Managing Member | Series C Preferred Stock
Minority Interest [Line Items]
Series A Preferred OP Units (in shares)	136,593				136,593				136,593	136,593	136,593
LTIP Units
Minority Interest [Line Items]
LTIP units outstanding (in shares)	2,569,044				2,274,147				2,569,044	2,274,147	1,997,099

Shareholders' Equity, Noncont_9

Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Preferred OP Units - Additional Information (Details) - USD ($)	12 Months Ended			36 Months Ended	240 Months Ended
	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 1999	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Denominator for Series A Preferred OP Unit conversion	$ 7,500			$ 7,500	$ 7,500
Common Shares
Class of Stock [Line Items]
Issuance of common shares, net of issuance costs (in Shares)		12,961,000
Gotham Plaza | Common Shares
Class of Stock [Line Items]
Issuance of common shares, net of issuance costs (in Shares)		442,478
Preferred quarterly distribution per share price		$ 0.9375
Number of convertible units if share price below $28.80 (in shares)		3.4722
Number of convertible units if share price above $35.20 (in shares)		2.8409
Operating Partnership, as General Partner or Managing Member
Class of Stock [Line Items]
Series A Preferred OP Units (in shares)	3,329,640	3,308,875		3,329,640	3,329,640	3,328,873
Preferred OP Units
Class of Stock [Line Items]
Issuance of common shares, net of issuance costs (in Shares)	0
Preferred OP Units | Gotham Plaza
Class of Stock [Line Items]
Issuance of common shares, net of issuance costs (in Shares)		141,593
Share price (in dollars per share)		$ 100
Preferred OP Units | Gotham Plaza | Minimum
Class of Stock [Line Items]
Share price at conversion date		28.80
Preferred OP Units | Gotham Plaza | Maximum
Class of Stock [Line Items]
Share price at conversion date		$ 35.20
Series A Preferred Stock
Class of Stock [Line Items]
Issuance of common shares, net of issuance costs (in Shares)			1,580
Preferred stock, stated value per unit	$ 1,000			$ 1,000	$ 1,000
Per unit conversion amount, Series A Preferred OP Units (in dollars per unit)	$ 22.50			$ 22.50	$ 22.50
Per unit conversion annual rate, Preferred OP Units	9.00%			9.00%	9.00%
Number of preferred OP Units converted (in shares)					1,392
Units converted from Preferred OP Units (in shares)					185,600
Series A Preferred Stock | Operating Partnership, as General Partner or Managing Member
Class of Stock [Line Items]
Series A Preferred OP Units (in shares)	188	188		188	188	188
Series C Preferred Stock | Gotham Plaza
Class of Stock [Line Items]
Number of preferred OP Units converted (in shares)				5,000
Units converted from Preferred OP Units (in shares)				17,165
Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member
Class of Stock [Line Items]
Series A Preferred OP Units (in shares)	136,593	136,593		136,593	136,593	136,593

Leases - Operating Leases - Add

Leases - Operating Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)shopping_center	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Operating Leased Assets [Line Items]
Number of shopping centers with land leases | shopping_center	6
Ground lease expense	$ 1.7	$ 1.4	$ 1.2
Rent expense capitalized	0	0.1	0.6
Rent expense	$ 1	$ 1	$ 1
Minimum
Operating Leased Assets [Line Items]
Operating lease term	1 month
Maximum
Operating Leased Assets [Line Items]
Operating lease term	60 years
Period of lease term	22 years

Leases - Capital Leases - Addit

Leases - Capital Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital Leased Assets [Line Items]
Capital lease term	49 years
Capital Lease Obligations
Capital Leased Assets [Line Items]
Repayments capital lease obligations	$ 2.5	$ 2.5	$ 1.3

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Rental Revenues and Payments for Operating and Capital Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Minimum Rental Revenues
2,019	$ 187,158
2,020	178,691
2,021	159,749
2,022	139,294
2,023	121,456
Thereafter	513,853
Total	1,300,201
Minimum Rental Payments
2,019	4,775
2,020	4,571
2,021	4,354
2,022	4,404
2,023	4,425
Thereafter	180,618
Total	$ 203,147

Segment Reporting - Additional

Segment Reporting - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018segment
Segment Reporting [Abstract]
Number of reportable segments	3

Segment Reporting - Summary of

Segment Reporting - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 69,445	$ 66,075	$ 63,569	$ 63,124	$ 66,081	$ 62,678	$ 59,504	$ 61,999	$ 262,213	$ 250,262	$ 189,939
Depreciation and amortization									(117,549)	(104,934)	(70,011)
Property operating expenses, other operating and real estate taxes									(82,780)	(79,798)	(57,391)
General and administrative expenses									(34,343)	(33,756)	(40,648)
Impairment charge					(10,600)	(3,800)			0	(14,455)	0
Operating income									27,541	17,319	21,889
Gain on disposition of properties									5,140	48,886	81,965
Interest income									13,231	29,143	25,829
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively									9,302	23,371	39,449
Interest expense									(69,978)	(58,978)	(34,645)
Gain on change in control									0	5,571	0
Income tax provision									(934)	(1,004)	105
Net (loss) income	(6,671)	(2,597)	(2,270)	(4,160)	24,944	13,285	6,108	19,971	(15,698)	64,308	134,592
Net (income) loss attributable to noncontrolling interests	(13,801)	(11,822)	(9,935)	(11,579)	4,032	418	(5,952)	4,340	47,137	(2,838)	(61,816)
Net income attributable to Acadia	7,130	$ 9,225	$ 7,665	$ 7,419	20,912	$ 12,867	$ 12,060	$ 15,631	31,439	61,470	72,776
Real estate at cost	3,697,805				3,466,482				3,697,805	3,466,482	3,382,000
Total assets	3,958,780				3,960,247				3,958,780	3,960,247	3,995,960
Cash paid for acquisition of real estate									147,985	200,429	495,644
Cash paid for development and property improvement costs									94,834	108,142	149,434
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Revenues									167,894	169,975	150,211
Depreciation and amortization									(60,903)	(61,705)	(54,582)
Property operating expenses, other operating and real estate taxes									(45,138)	(45,349)	(39,598)
General and administrative expenses									0	0
Impairment charge										0
Operating income									61,853	62,921	56,031
Gain on disposition of properties									0	0
Interest income									0	0
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively									7,415	3,735	3,774
Interest expense									(27,575)	(28,618)	(27,435)
Gain on change in control										5,571
Income tax provision									0	0
Net (loss) income									41,693	43,609	32,370
Net (income) loss attributable to noncontrolling interests									752	(1,107)	(3,411)
Net income attributable to Acadia									42,445	42,502	28,959
Real estate at cost	2,069,439				2,032,485				2,069,439	2,032,485	1,982,763
Total assets	2,232,695				2,305,663				2,232,695	2,305,663	2,271,620
Cash paid for acquisition of real estate									1,343	0	323,880
Cash paid for development and property improvement costs									32,662	42,026	13,434
Operating Segments | Funds
Segment Reporting Information [Line Items]
Revenues									94,319	80,287	39,728
Depreciation and amortization									(56,646)	(43,229)	(15,429)
Property operating expenses, other operating and real estate taxes									(37,642)	(34,449)	(17,793)
General and administrative expenses									0	0
Impairment charge										(14,455)
Operating income									31	(11,846)	6,506
Gain on disposition of properties									5,140	48,886	81,965
Interest income									0	0
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively									1,887	19,636	35,675
Interest expense									(42,403)	(30,360)	(7,210)
Gain on change in control										0
Income tax provision									0	0
Net (loss) income									(35,345)	26,316	116,936
Net (income) loss attributable to noncontrolling interests									46,385	(1,731)	(58,405)
Net income attributable to Acadia									11,040	24,585	58,531
Real estate at cost	1,628,366				1,433,997				1,628,366	1,433,997	1,399,237
Total assets	1,616,472				1,500,755				1,616,472	1,500,755	1,448,177
Cash paid for acquisition of real estate									146,642	200,429	171,764
Cash paid for development and property improvement costs									62,172	66,116	136,000
Operating Segments | Structured Financing
Segment Reporting Information [Line Items]
Revenues									0	0
Depreciation and amortization									0	0
Property operating expenses, other operating and real estate taxes									0	0
General and administrative expenses									0	0
Impairment charge										0
Operating income									0	0
Gain on disposition of properties									0	0
Interest income									13,231	29,143	25,829
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively									0	0
Interest expense									0	0
Gain on change in control										0
Income tax provision									0	0
Net (loss) income									13,231	29,143	25,829
Net (income) loss attributable to noncontrolling interests									0	0
Net income attributable to Acadia									13,231	29,143	25,829
Real estate at cost	0				0				0	0
Total assets	109,613				153,829				109,613	153,829	276,163
Cash paid for acquisition of real estate									0	0
Cash paid for development and property improvement costs									0	0
Unallocated
Segment Reporting Information [Line Items]
Revenues									0	0
Depreciation and amortization									0	0
Property operating expenses, other operating and real estate taxes									0	0
General and administrative expenses									(34,343)	(33,756)	(40,648)
Impairment charge										0
Operating income									(34,343)	(33,756)	(40,648)
Gain on disposition of properties									0	0
Interest income									0	0
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively									0	0
Interest expense									0	0
Gain on change in control										0
Income tax provision									(934)	(1,004)	105
Net (loss) income									(35,277)	(34,760)	(40,543)
Net (income) loss attributable to noncontrolling interests									0	0
Net income attributable to Acadia									(35,277)	(34,760)	$ (40,543)
Real estate at cost	0				0				0	0
Total assets	$ 0				$ 0				0	0
Cash paid for acquisition of real estate									0	0
Cash paid for development and property improvement costs									$ 0	$ 0

Segment Reporting - Summary o_2

Segment Reporting - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 16, 2017
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	$ 9,302	$ 23,371	$ 39,449
Core Portfolio
Segment Reporting Information [Line Items]
Equity method investment, ownership percentage	75.22%	61.11%		22.22%
Core Portfolio | Town Center
Segment Reporting Information [Line Items]
Equity method investment, ownership percentage	75.22%
Operating Segments | Core Portfolio
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	$ 7,415	$ 3,735	3,774
Operating Segments | Core Portfolio | Town Center
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively	$ 5,800	$ 1,900	$ 900
Equity method investment, ownership percentage	75.22%			22.22%
Property related cost	$ 700

Share Incentive and Other Com_3

Share Incentive and Other Compensation - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit based compensation				$ 12,948,000	$ 11,155,000	$ 13,695,000
Trustee fees		$ 1,300,000	$ 1,300,000
Total unrecognized compensation cost related to nonvested awards		$ 14,100,000
Weighted-average period over which cost is expected to be recognized		1 year 7 months 6 days
Performance Period Ending December 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				33.30%
Award vesting period				3 years
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures	26,632
Compensation expense	$ 600,000
Compensation expense related to acceleration of previously granted	$ 1,700,000
Total fair value of shares that vested		$ 12,800,000			7,300,000
LTIP Units | Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		17,427
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date		8,949
LTIP Units | Performance Period Ending December 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				66.70%
Award vesting period				3 years
LTIP Units | Tranche One | Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		8,478
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares that vested		$ 800,000			$ 700,000
Restricted shares | Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		17,050
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date		5,181
Restricted shares | Tranche One | Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		11,869
LTIP Units and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total value of restricted shares and LTIP units as of the grant date				$ 10,400,000
Weighted average grant date fair value, grants (in dollars per share)		$ 26.64			$ 31.69
LTIP Units and Restricted Stock | Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date		33.00%
LTIP Units and Restricted Stock | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit based compensation				$ 8,400,000	$ 8,400,000
LTIP Units and Restricted Stock | Performance Period Ending December 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
LTIP Units and Restricted Stock | Performance Fails To Achieve, Earned Performance-Based Shares Vest At End Of Performance Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				60.00%
LTIP Units and Restricted Stock | Performance Fails To Achieve
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				40.00%
Award vesting period				2 years
LTIP Units and Restricted Stock | Minimum | TSR percentile falls between the 25th percentile and the 50th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				50.00%
LTIP Units and Restricted Stock | Minimum | TSR percentile falls between the 50th percentile and 75th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				100.00%
LTIP Units and Restricted Stock | Maximum | TSR percentile falls between the 25th percentile and the 50th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				100.00%
LTIP Units and Restricted Stock | Maximum | TSR percentile falls between the 50th percentile and 75th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				200.00%
Employee Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 300,000	$ 200,000	$ 200,000
Share Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	1,176,340			1,176,340
Share Incentive Plan | LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures				381,821
Share Incentive Plan | Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures				5,767
Performance Shares 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period				3 years
Volatility rate				(18.00%)
Risk-free interest rates				(2.40%)
Long Term Investment Alignment Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Max percentage of future fund III promote that may be awarded to senior executives							25.00%
Long Term Investment Alignment Program | Fund III
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 0	$ 600,000
Percentage of promote awarded as share based compensation award							25.00%
Long Term Investment Alignment Program | Fund IV
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of promote awarded as share based compensation award							22.80%
Awards in connection with fund to have intrinsic value		$ 0

Share Incentive and Other Com_4

Share Incentive and Other Compensation - Schedule of Unvested Shares and LTIP Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares unvested, Beginning of period (in shares)	41,327	46,499	49,899
Shares granted (in shares)	22,817	19,442	21,675
Shares vested (in shares)	(25,261)	(23,430)	(24,886)
Shares forfeited (in shares)	(428)	(1,184)	(189)
Shares unvested, End of period (in shares)	38,455	41,327	46,499
Weighted Grant-Date Fair Value
Shares unvested, Weighted average grant date fair value, Beginning of period (in dollars per share)	$ 26.92	$ 27.58	$ 25.90
Shares granted, Weighted average grant date fair value (in dollars per share)	23.65	29.85	33.35
Shares vested, Weighted average grant date fair value (in dollars per share)	30.79	30.47	29.17
Shares forfeited, Weighted average grant date fair value (in dollars per share)	27.25	32.65	35.37
Shares unvested, Weighted average grant date fair value, End of period (in dollars per share)	$ 22.44	$ 26.92	$ 27.58
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares unvested, Beginning of period (in shares)	910,099	856,877	1,020,121
Shares granted (in shares)	425,880	310,551	359,484
Shares vested (in shares)	(431,827)	(257,124)	(522,680)
Shares forfeited (in shares)	(12,266)	(205)	(48)
Shares unvested, End of period (in shares)	891,886	910,099	856,877
Weighted Grant-Date Fair Value
Shares unvested, Weighted average grant date fair value, Beginning of period (in dollars per share)	$ 28.28	$ 26.99	$ 23.92
Shares granted, Weighted average grant date fair value (in dollars per share)	26.80	31.80	34.40
Shares vested, Weighted average grant date fair value (in dollars per share)	29.72	28.27	26.08
Shares forfeited, Weighted average grant date fair value (in dollars per share)	28.57	32.49	35.37
Shares unvested, Weighted average grant date fair value, End of period (in dollars per share)	$ 26.87	$ 28.28	$ 26.99

Share Incentive and Other Com_5

Share Incentive and Other Compensation - Employee Share Purchase Plan and Deferred Share Plan - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee share purchase discount rate	15.00%
Employee share purchase maximum purchase amount	$ 25,000
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee share purchase (in shares)	3,495	4,514

Share Incentive and Other Com_6

Share Incentive and Other Compensation - Employee 401 (k) Plan - Additional Information (Details)	9 Months Ended
	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Employer matching contribution	50.00%
Maximum annual contribution per employee	6.00%
Maximum employee annual salary contribution	15.00%

Federal Income Taxes - Addition

Federal Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Minimum distribution percentage of annual taxable income to qualify as REIT	90.00%
Maximum percentage of total assets consisting of securities of taxable REIT subsidiaries	20.00%
Deferred tax assets, additional tax basis in RCP Investments	$ 0	$ 1
Deferred tax assets, capital loss carryforwards	0.1	0
Deferred tax assets, operating loss carryforwards	$ 2	$ 1.1

Federal Income Taxes - Reconcil

Federal Income Taxes - Reconciliation of Net Income to Taxable Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net income attributable to Acadia	$ 7,130	$ 9,225	$ 7,665	$ 7,419	$ 20,912	$ 12,867	$ 12,060	$ 15,631	$ 31,439	$ 61,470	$ 72,776
Deferred cancellation of indebtedness income									2,050	2,050	2,050
Deferred rental and other income									1,222	(934)	1,610
Book/tax difference - depreciation and amortization									23,166	21,334	15,189
Straight-line rent and above- and below-market rent adjustments									(12,129)	(10,559)	(7,882)
Book/tax differences - equity-based compensation									6,042	5,325	10,307
Joint venture equity in earnings, net									13,905	9,114	(2,011)
Impairment charges and reserves									0	0	769
Acquisition costs									326	1,135	5,116
Gains									0	(5,181)	0
Book/tax differences - miscellaneous									(2,821)	930	(4,924)
Taxable income									63,200	84,684	93,000
Distributions declared									$ 89,122	$ 87,848	$ 91,053

Federal Income Taxes - Tax Stat

Federal Income Taxes - Tax Status of Dividends (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Total (in dollars per share)	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16
Characterization Of Distributions For Federal Income Tax Purposes
Income Tax Contingency [Line Items]
Qualified dividend (in dollars per share)									0	0	0
Capital gain (in dollars per share)									0	0.23	0.39
Total (in dollars per share)									$ 0.87	$ 1.05	$ 1.16
Qualified dividend									0.00%	0.00%	0.00%
Capital gain									0.00%	22.00%	34.00%
Total									100.00%	100.00%	100.00%
Characterization Of Distributions For Federal Income Tax Purposes | Non-Section 199A
Income Tax Contingency [Line Items]
Ordinary income (in dollars per share)									$ 0	$ 0.82	$ 0.77
Ordinary income									0.00%	78.00%	66.00%
Characterization Of Distributions For Federal Income Tax Purposes | Section 199A
Income Tax Contingency [Line Items]
Ordinary income (in dollars per share)									$ 0.87	$ 0	$ 0
Ordinary income									100.00%	0.00%	0.00%

Federal Income Taxes - Tax St_2

Federal Income Taxes - Tax Status of Dividends (Parenthetical) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Dividend per common share	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16
Dividend per common share, 2018									0.06
Dividend per common share, 2019									$ 0.22

Federal Income Taxes - Income a

Federal Income Taxes - Income and Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
(Provision) benefit for income taxes:
TRS net loss before noncontrolling interests									$ 31,439	$ 61,470	$ 72,776
Net loss (income) attributable to noncontrolling interests	$ (13,801)	$ (11,822)	$ (9,935)	$ (11,579)	$ 4,032	$ 418	$ (5,952)	$ 4,340	47,137	(2,838)	(61,816)
Net (loss) income	$ (6,671)	$ (2,597)	$ (2,270)	$ (4,160)	$ 24,944	$ 13,285	$ 6,108	$ 19,971	(15,698)	64,308	134,592
TRS [Member]
Income Tax Contingency [Line Items]
TRS loss before income taxes									(2,609)	(3,604)	(1,583)
(Provision) benefit for income taxes:
Federal									(377)	(982)	378
State and local									26	423	97
TRS net loss before noncontrolling interests									(2,960)	(4,163)	(1,108)
Net loss (income) attributable to noncontrolling interests									4	8	(9)
Net (loss) income									$ (2,956)	$ (4,155)	$ (1,117)

Federal Income Taxes - Tax Reco

Federal Income Taxes - Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal tax benefit at statutory tax rate	$ (548)	$ (1,225)	$ (538)
TRS state and local taxes, net of Federal benefit	(165)	(190)	(84)
Permanent differences, net	951	1,131	1,663
Prior year over-accrual, net	0	(1,541)	0
Effect of Tax Cuts and Jobs Act	0	1,982	0
Other	172	404	(1,516)
REIT state and local income and franchise taxes	524	443	370
Total provision (benefit) for income taxes	$ 934	$ 1,004	$ (105)

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Description of conversion of common OP units to common shares	The effect of the conversion of Common OP Units is not reflected in the computation of basic and diluted earnings per share, as they are exchangeable for Common Shares on a one-for-one basis.
Conversion of common OP units to common shares	100.00%

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income attributable to Acadia									$ 31,439	$ 61,470	$ 72,776
Less: net income attributable to participating securities									(267)	(642)	(793)
Income from continuing operations net of income attributable to participating securities									$ 31,172	$ 60,828	$ 71,983
Denominator:
Weighted average shares for basic earnings per share (in shares)									82,080,159	83,682,789	76,231,000
Effect of dilutive securities:
Employee unvested restricted shares (in shares)									0	2,682	12,550
Denominator for diluted earnings per share (in shares)	81,591	81,566	81,756	83,438	83,733	83,700	83,662	83,646	82,080,159	83,685,471	76,243,550
Basic and diluted earnings per share (in dollars per share)									$ 0.38	$ 0.73	$ 0.94
Series A Preferred OP Units
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)									188	188	188
Series A Preferred OP Units - Common Share Equivalent
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)									25,067	25,067	25,067
Series C Preferred OP Units
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)									136,593	136,593	141,593
Series C Preferred OP Units - Common Share Equivalent
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)									474,278	479,978	410,207
Restricted shares
Anti-Dilutive Shares Excluded from Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)									36,879	41,299	50,156

Summary of Quarterly Financia_3

Summary of Quarterly Financial Information (Unaudited) (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)property$ / sharesshares	Sep. 30, 2018USD ($)property$ / sharesshares	Jun. 30, 2018USD ($)$ / sharesshares	Mar. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)property$ / sharesshares	Sep. 30, 2017USD ($)property$ / sharesshares	Jun. 30, 2017USD ($)$ / sharesshares	Mar. 31, 2017USD ($)property$ / sharesshares	Dec. 31, 2018USD ($)property$ / sharesshares	Dec. 31, 2017USD ($)property$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares
Interim Period, Costs Not Allocable [Line Items]
Revenues	$ 69,445	$ 66,075	$ 63,569	$ 63,124	$ 66,081	$ 62,678	$ 59,504	$ 61,999	$ 262,213	$ 250,262	$ 189,939
Net (loss) income	(6,671)	(2,597)	(2,270)	(4,160)	24,944	13,285	6,108	19,971	(15,698)	64,308	134,592
Net loss attributable to noncontrolling interests	13,801	11,822	9,935	11,579	(4,032)	(418)	5,952	(4,340)	(47,137)	2,838	61,816
Net income attributable to Acadia	$ 7,130	$ 9,225	$ 7,665	$ 7,419	$ 20,912	$ 12,867	$ 12,060	$ 15,631	$ 31,439	$ 61,470	$ 72,776
Basic (in dollars per share) | $ / shares	$ 0.09	$ 0.11	$ 0.09	$ 0.09	$ 0.25	$ 0.15	$ 0.14	$ 0.18
Diluted (in dollars per share) | $ / shares	$ 0.09	$ 0.11	$ 0.09	$ 0.09	$ 0.25	$ 0.15	$ 0.14	$ 0.18
Weighted average number of shares: Basic | shares	81,591	81,566	81,756	83,434	83,733	83,700	83,662	83,635
Weighted average number of shares: Diluted | shares	81,591	81,566	81,756	83,438	83,733	83,700	83,662	83,646	82,080,159	83,685,471	76,243,550
Dividend per common share | $ / shares	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16
Number of retail properties | property	171								171
Impairment charges					$ 10,600	$ 3,800			$ 0	$ 14,455	$ 0
Gain on change in control and other					5,600
Noncontrolling Interests
Interim Period, Costs Not Allocable [Line Items]
Net (loss) income									$ (47,137)	$ 2,838	$ 61,816
Impairment charges					7,600	2,700
Disposed of by sale
Interim Period, Costs Not Allocable [Line Items]
Gain (loss) on disposal		$ 5,100			$ 35,900	$ 13,000	$ 3,300	$ 14,500
Number of retail properties | property		2			3	2		2		3
Disposed of by sale | Partnership Interest
Interim Period, Costs Not Allocable [Line Items]
Gain (loss) on disposal							$ 800	$ 2,700
Disposed of by sale | Noncontrolling Interests
Interim Period, Costs Not Allocable [Line Items]
Gain (loss) on disposal		$ 3,900			$ 26,700	$ 10,700

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($)	Jan. 23, 2019	Jan. 09, 2019	Jan. 04, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 11, 2019
Subsequent Event [Line Items]
Derivative, notional amount				$ 69,670,000
Proceeds from the disposition of properties				63,866,000	$ 260,711,000	$ 150,378,000
Fund III
Subsequent Event [Line Items]
Capital called				423,900,000
Capital called company share amount				551,900,000
Interest Rate Swaps
Subsequent Event [Line Items]
Derivative, notional amount				$ 50,000,000
Derivative fixed interest rate				2.80%
Interest Rate Swaps | Mortgages
Subsequent Event [Line Items]
Derivative, notional amount				$ 136,600,000
Derivative fixed interest rate				2.86%
Subsequent Event
Subsequent Event [Line Items]
Derivative remaining maturity periods			10 years
Subsequent Event | Fund III | 3104 M Street Property
Subsequent Event [Line Items]
Proceeds from the disposition of properties	$ 10,500,000
Subsequent Event | Renaissance Portfolio | Fund III | 3104 M Street Property
Subsequent Event [Line Items]
Equity method investment, ownership percentage	20.00%
Subsequent Event | Renaissance Portfolio | Fund III | 3104 M Street Property | Mortgages
Subsequent Event [Line Items]
Equity method investments	$ 4,700,000
Subsequent Event | Interest Rate Swaps
Subsequent Event [Line Items]
Derivative, notional amount			$ 100,000,000
Derivative fixed interest rate			2.60%
Subsequent Event | Interest Rate Swaps | Fund V | Elk Grove Commons - Elk Grove, CA
Subsequent Event [Line Items]
Borrowings, amount							$ 41,500,000
Subsequent Event | Fund V
Subsequent Event [Line Items]
Capital called		$ 33,200,000
Capital called company share amount		$ 6,700,000

SCHEDULE II - VALUATION AND Q_2

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for deferred tax asset
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,530	$ 859	$ 0
Charged to Expenses	0	0	0
Adjustments to Valuation Accounts	0	671	859
Deductions	(1,530)	0	0
Balance at End of Year	0	1,530	859
Allowance for uncollectible accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	5,920	5,720	7,451
Charged to Expenses	2,532	200	0
Adjustments to Valuation Accounts	(531)	0	0
Deductions	0	0	(1,731)
Balance at End of Year	7,921	5,920	5,720
Allowance for notes receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	0	0	0
Charged to Expenses	0	0	0
Adjustments to Valuation Accounts	0	0	0
Deductions	0	0	0
Balance at End of Year	$ 0	$ 0	$ 0

SCHEDULE III - REAL ESTATE AN_2

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 1,017,288
Initial Cost to Company of Land	769,582
Initial Cost to Company of Buildings and Improvements	2,079,002
Increase (Decrease) in Net Investments	849,221
Carrying Amount of Land	775,766
Carrying Amount of Buildings and Improvements	2,922,039
Total Carrying Amount	3,697,805	$ 3,466,482	$ 3,382,000	$ 2,736,283
Accumulated Depreciation	416,657	339,862	$ 287,066	$ 298,703
Unamortized Loan Costs	(10,173)
Unamortized Premium	753	$ 856
Real estate, federal income tax basis	$ 3,400,000
Buildings
Real Estate And Accumulated Depreciation [Line Items]
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Real Estate Under Development
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 47,645
Initial Cost to Company of Land	65,297
Initial Cost to Company of Buildings and Improvements	31,473
Increase (Decrease) in Net Investments	23,527
Carrying Amount of Land	65,297
Carrying Amount of Buildings and Improvements	55,000
Total Carrying Amount	120,297
Core Portfolio | Crescent Plaza Brockton, MA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	1,147
Initial Cost to Company of Buildings and Improvements	7,425
Increase (Decrease) in Net Investments	3,222
Carrying Amount of Land	1,147
Carrying Amount of Buildings and Improvements	10,647
Total Carrying Amount	11,794
Accumulated Depreciation	$ 8,112
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | New Loudon Center Latham, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 505
Initial Cost to Company of Buildings and Improvements	4,161
Increase (Decrease) in Net Investments	13,965
Carrying Amount of Land	505
Carrying Amount of Buildings and Improvements	18,126
Total Carrying Amount	18,631
Accumulated Depreciation	$ 14,890
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Mark Plaza Edwardsville, PA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 3,396
Carrying Amount of Buildings and Improvements	3,396
Total Carrying Amount	3,396
Accumulated Depreciation	$ 2,981
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Plaza 422 Lebanon, PA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 190
Initial Cost to Company of Buildings and Improvements	3,004
Increase (Decrease) in Net Investments	2,809
Carrying Amount of Land	190
Carrying Amount of Buildings and Improvements	5,813
Total Carrying Amount	6,003
Accumulated Depreciation	$ 5,227
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Route 6 Mall Honesdale, PA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,664
Increase (Decrease) in Net Investments	12,490
Carrying Amount of Land	1,664
Carrying Amount of Buildings and Improvements	12,490
Total Carrying Amount	14,154
Accumulated Depreciation	$ 9,813
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Abington Towne Center Abington, PA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 799
Initial Cost to Company of Buildings and Improvements	3,197
Increase (Decrease) in Net Investments	2,876
Carrying Amount of Land	799
Carrying Amount of Buildings and Improvements	6,073
Total Carrying Amount	6,872
Accumulated Depreciation	$ 4,016
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Bloomfield Town Square Bloomfield Hills, MI
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,207
Initial Cost to Company of Buildings and Improvements	13,774
Increase (Decrease) in Net Investments	25,803
Carrying Amount of Land	3,207
Carrying Amount of Buildings and Improvements	39,577
Total Carrying Amount	42,784
Accumulated Depreciation	$ 23,366
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Elmwood Park Shopping Center Elmwood Park, NJ
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,248
Initial Cost to Company of Buildings and Improvements	12,992
Increase (Decrease) in Net Investments	15,738
Carrying Amount of Land	3,798
Carrying Amount of Buildings and Improvements	28,180
Total Carrying Amount	31,978
Accumulated Depreciation	$ 19,867
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Merrillville Plaza Hobart, IN
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,288
Initial Cost to Company of Buildings and Improvements	17,152
Increase (Decrease) in Net Investments	5,726
Carrying Amount of Land	4,288
Carrying Amount of Buildings and Improvements	22,878
Total Carrying Amount	27,166
Accumulated Depreciation	$ 13,173
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Marketplace of Absecon Absecon, NJ
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 2,573
Initial Cost to Company of Buildings and Improvements	10,294
Increase (Decrease) in Net Investments	4,920
Carrying Amount of Land	2,577
Carrying Amount of Buildings and Improvements	15,210
Total Carrying Amount	17,787
Accumulated Depreciation	$ 8,603
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 239 Greenwich Avenue Greenwich, CT
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 27,000
Initial Cost to Company of Land	1,817
Initial Cost to Company of Buildings and Improvements	15,846
Increase (Decrease) in Net Investments	1,086
Carrying Amount of Land	1,817
Carrying Amount of Buildings and Improvements	16,932
Total Carrying Amount	18,749
Accumulated Depreciation	$ 8,285
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Hobson West Plaza Naperville, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,793
Initial Cost to Company of Buildings and Improvements	7,172
Increase (Decrease) in Net Investments	4,069
Carrying Amount of Land	1,793
Carrying Amount of Buildings and Improvements	11,241
Total Carrying Amount	13,034
Accumulated Depreciation	$ 5,431
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Village Commons Shopping Center Smithtown, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,229
Initial Cost to Company of Buildings and Improvements	12,917
Increase (Decrease) in Net Investments	4,597
Carrying Amount of Land	3,229
Carrying Amount of Buildings and Improvements	17,514
Total Carrying Amount	20,743
Accumulated Depreciation	$ 9,918
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Town Line Plaza Rocky Hill, CT
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 878
Initial Cost to Company of Buildings and Improvements	3,510
Increase (Decrease) in Net Investments	7,736
Carrying Amount of Land	907
Carrying Amount of Buildings and Improvements	11,217
Total Carrying Amount	12,124
Accumulated Depreciation	$ 9,206
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Branch Shopping Center Smithtown, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,156
Initial Cost to Company of Buildings and Improvements	12,545
Increase (Decrease) in Net Investments	16,119
Carrying Amount of Land	3,401
Carrying Amount of Buildings and Improvements	28,419
Total Carrying Amount	31,820
Accumulated Depreciation	$ 12,757
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Methuen Shopping Center Methuen, MA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 956
Initial Cost to Company of Buildings and Improvements	3,826
Increase (Decrease) in Net Investments	1,484
Carrying Amount of Land	961
Carrying Amount of Buildings and Improvements	5,305
Total Carrying Amount	6,266
Accumulated Depreciation	$ 2,683
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | The Gateway Shopping Center South Burlington, VT
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,273
Initial Cost to Company of Buildings and Improvements	5,091
Increase (Decrease) in Net Investments	12,413
Carrying Amount of Land	1,273
Carrying Amount of Buildings and Improvements	17,504
Total Carrying Amount	18,777
Accumulated Depreciation	$ 10,169
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Mad River Station Dayton, OH
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 2,350
Initial Cost to Company of Buildings and Improvements	9,404
Increase (Decrease) in Net Investments	2,173
Carrying Amount of Land	2,350
Carrying Amount of Buildings and Improvements	11,577
Total Carrying Amount	13,927
Accumulated Depreciation	$ 5,955
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Pacesetter Park Shopping Center Ramapo, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,475
Initial Cost to Company of Buildings and Improvements	5,899
Increase (Decrease) in Net Investments	3,743
Carrying Amount of Land	1,475
Carrying Amount of Buildings and Improvements	9,642
Total Carrying Amount	11,117
Accumulated Depreciation	$ 5,439
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Town Center
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 26,250
Initial Cost to Company of Land	5,063
Initial Cost to Company of Buildings and Improvements	15,252
Increase (Decrease) in Net Investments	2,495
Carrying Amount of Land	5,201
Carrying Amount of Buildings and Improvements	17,609
Total Carrying Amount	22,810
Accumulated Depreciation	$ 7,199
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Bartow Avenue Bronx, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,691
Initial Cost to Company of Buildings and Improvements	5,803
Increase (Decrease) in Net Investments	1,190
Carrying Amount of Land	1,691
Carrying Amount of Buildings and Improvements	6,993
Total Carrying Amount	8,684
Accumulated Depreciation	$ 3,250
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Amboy Road Staten Island, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 11,909
Increase (Decrease) in Net Investments	2,632
Carrying Amount of Buildings and Improvements	14,541
Total Carrying Amount	14,541
Accumulated Depreciation	$ 7,319
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Chestnut Hill Philadelphia, PA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 8,289
Initial Cost to Company of Buildings and Improvements	5,691
Increase (Decrease) in Net Investments	4,509
Carrying Amount of Land	8,289
Carrying Amount of Buildings and Improvements	10,200
Total Carrying Amount	18,489
Accumulated Depreciation	$ 4,447
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 2914 Third Avenue Bronx, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 11,108
Initial Cost to Company of Buildings and Improvements	8,038
Increase (Decrease) in Net Investments	4,788
Carrying Amount of Land	11,855
Carrying Amount of Buildings and Improvements	12,079
Total Carrying Amount	23,934
Accumulated Depreciation	$ 3,085
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | West Shore Expressway Staten Island, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,380
Initial Cost to Company of Buildings and Improvements	13,499
Carrying Amount of Land	3,380
Carrying Amount of Buildings and Improvements	13,499
Total Carrying Amount	16,879
Accumulated Depreciation	$ 4,496
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | West 54th Street Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 16,699
Initial Cost to Company of Buildings and Improvements	18,704
Increase (Decrease) in Net Investments	1,234
Carrying Amount of Land	16,699
Carrying Amount of Buildings and Improvements	19,938
Total Carrying Amount	36,637
Accumulated Depreciation	$ 6,184
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 5-7 East 17th Street Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,048
Initial Cost to Company of Buildings and Improvements	7,281
Increase (Decrease) in Net Investments	6,133
Carrying Amount of Land	3,048
Carrying Amount of Buildings and Improvements	13,414
Total Carrying Amount	16,462
Accumulated Depreciation	$ 2,855
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 651-671 W Diversey Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 8,576
Initial Cost to Company of Buildings and Improvements	17,256
Increase (Decrease) in Net Investments	8
Carrying Amount of Land	8,576
Carrying Amount of Buildings and Improvements	17,264
Total Carrying Amount	25,840
Accumulated Depreciation	$ 3,273
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 15 Mercer Street New York, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,887
Initial Cost to Company of Buildings and Improvements	2,483
Carrying Amount of Land	1,887
Carrying Amount of Buildings and Improvements	2,483
Total Carrying Amount	4,370
Accumulated Depreciation	$ 466
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 4401 White Plains Bronx, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,581
Initial Cost to Company of Buildings and Improvements	5,054
Carrying Amount of Land	1,581
Carrying Amount of Buildings and Improvements	5,054
Total Carrying Amount	6,635
Accumulated Depreciation	$ 927
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Chicago Street Retail Portfolio
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 27,588
Initial Cost to Company of Buildings and Improvements	52,274
Increase (Decrease) in Net Investments	14,804
Carrying Amount of Land	27,626
Carrying Amount of Buildings and Improvements	67,040
Total Carrying Amount	94,666
Accumulated Depreciation	$ 13,063
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 1520 Milwaukee Avenue Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 2,110
Initial Cost to Company of Buildings and Improvements	1,306
Increase (Decrease) in Net Investments	290
Carrying Amount of Land	2,110
Carrying Amount of Buildings and Improvements	1,596
Total Carrying Amount	3,706
Accumulated Depreciation	$ 243
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 330-340 River St Cambridge, MA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 11,396
Initial Cost to Company of Land	8,404
Initial Cost to Company of Buildings and Improvements	14,235
Carrying Amount of Land	8,404
Carrying Amount of Buildings and Improvements	14,235
Total Carrying Amount	22,639
Accumulated Depreciation	$ 2,547
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Rhode Island Place Shopping Center Washington, D.C.
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 7,458
Initial Cost to Company of Buildings and Improvements	15,968
Increase (Decrease) in Net Investments	1,924
Carrying Amount of Land	7,458
Carrying Amount of Buildings and Improvements	17,892
Total Carrying Amount	25,350
Accumulated Depreciation	$ 3,314
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 930 Rush Street Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,933
Initial Cost to Company of Buildings and Improvements	14,587
Carrying Amount of Land	4,933
Carrying Amount of Buildings and Improvements	14,587
Total Carrying Amount	19,520
Accumulated Depreciation	$ 2,461
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 28 Jericho Turnpike Westbury, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 13,918
Initial Cost to Company of Land	6,220
Initial Cost to Company of Buildings and Improvements	24,416
Carrying Amount of Land	6,220
Carrying Amount of Buildings and Improvements	24,416
Total Carrying Amount	30,636
Accumulated Depreciation	$ 4,215
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 181 Main Street Westport, CT
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,908
Initial Cost to Company of Buildings and Improvements	12,158
Increase (Decrease) in Net Investments	407
Carrying Amount of Land	1,908
Carrying Amount of Buildings and Improvements	12,565
Total Carrying Amount	14,473
Accumulated Depreciation	$ 1,943
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 83 Spring Street Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,754
Initial Cost to Company of Buildings and Improvements	9,200
Carrying Amount of Land	1,754
Carrying Amount of Buildings and Improvements	9,200
Total Carrying Amount	10,954
Accumulated Depreciation	$ 1,495
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 60 Orange Street Bloomfield, NJ
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 7,266
Initial Cost to Company of Land	3,609
Initial Cost to Company of Buildings and Improvements	10,790
Carrying Amount of Land	3,609
Carrying Amount of Buildings and Improvements	10,790
Total Carrying Amount	14,399
Accumulated Depreciation	$ 1,859
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 179-53 & 1801-03 Connecticut Avenue Washington, D.C.
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 11,690
Initial Cost to Company of Buildings and Improvements	10,135
Increase (Decrease) in Net Investments	1,014
Carrying Amount of Land	11,690
Carrying Amount of Buildings and Improvements	11,149
Total Carrying Amount	22,839
Accumulated Depreciation	$ 1,863
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 639 West Diversey Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,429
Initial Cost to Company of Buildings and Improvements	6,102
Increase (Decrease) in Net Investments	916
Carrying Amount of Land	4,429
Carrying Amount of Buildings and Improvements	7,018
Total Carrying Amount	11,447
Accumulated Depreciation	$ 1,283
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 664 North Michigan Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 15,240
Initial Cost to Company of Buildings and Improvements	65,331
Carrying Amount of Land	15,240
Carrying Amount of Buildings and Improvements	65,331
Total Carrying Amount	80,571
Accumulated Depreciation	$ 9,601
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 8-12 E. Walton Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 5,398
Initial Cost to Company of Buildings and Improvements	15,601
Increase (Decrease) in Net Investments	977
Carrying Amount of Land	5,398
Carrying Amount of Buildings and Improvements	16,578
Total Carrying Amount	21,976
Accumulated Depreciation	$ 2,394
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 3200-3204 M Street Washington, DC
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 6,899
Initial Cost to Company of Buildings and Improvements	4,249
Increase (Decrease) in Net Investments	168
Carrying Amount of Land	6,899
Carrying Amount of Buildings and Improvements	4,417
Total Carrying Amount	11,316
Accumulated Depreciation	$ 693
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 868 Broadway Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 3,519
Initial Cost to Company of Buildings and Improvements	9,247
Increase (Decrease) in Net Investments	5
Carrying Amount of Land	3,519
Carrying Amount of Buildings and Improvements	9,252
Total Carrying Amount	12,771
Accumulated Depreciation	$ 1,174
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 313-315 Bowery Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 5,516
Carrying Amount of Buildings and Improvements	5,516
Total Carrying Amount	5,516
Accumulated Depreciation	$ 1,116
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 120 West Broadway Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 32,819
Increase (Decrease) in Net Investments	1,116
Carrying Amount of Buildings and Improvements	33,935
Total Carrying Amount	33,935
Accumulated Depreciation	$ 2,798
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 11 E. Walton Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 16,744
Initial Cost to Company of Buildings and Improvements	28,346
Increase (Decrease) in Net Investments	192
Carrying Amount of Land	16,744
Carrying Amount of Buildings and Improvements	28,538
Total Carrying Amount	45,282
Accumulated Depreciation	$ 3,648
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 61 Main St. Westport, CT
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,578
Initial Cost to Company of Buildings and Improvements	2,645
Increase (Decrease) in Net Investments	706
Carrying Amount of Land	4,578
Carrying Amount of Buildings and Improvements	3,351
Total Carrying Amount	7,929
Accumulated Depreciation	$ 371
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 865 W. North Avenue Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,893
Initial Cost to Company of Buildings and Improvements	11,594
Increase (Decrease) in Net Investments	23
Carrying Amount of Land	1,893
Carrying Amount of Buildings and Improvements	11,617
Total Carrying Amount	13,510
Accumulated Depreciation	$ 1,396
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 152-154 Spring St. Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 8,544
Initial Cost to Company of Buildings and Improvements	27,001
Carrying Amount of Land	8,544
Carrying Amount of Buildings and Improvements	27,001
Total Carrying Amount	35,545
Accumulated Depreciation	$ 3,184
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 2520 Flatbush Ave Brooklyn, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 6,613
Initial Cost to Company of Buildings and Improvements	10,419
Increase (Decrease) in Net Investments	248
Carrying Amount of Land	6,613
Carrying Amount of Buildings and Improvements	10,667
Total Carrying Amount	17,280
Accumulated Depreciation	$ 1,299
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 252-256 Greenwich Avenue Greenwich, CT
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 10,175
Initial Cost to Company of Buildings and Improvements	12,641
Increase (Decrease) in Net Investments	544
Carrying Amount of Land	10,175
Carrying Amount of Buildings and Improvements	13,185
Total Carrying Amount	23,360
Accumulated Depreciation	$ 1,647
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Bedford Green Bedford Hills, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 12,425
Initial Cost to Company of Buildings and Improvements	32,730
Increase (Decrease) in Net Investments	4,102
Carrying Amount of Land	13,763
Carrying Amount of Buildings and Improvements	35,494
Total Carrying Amount	49,257
Accumulated Depreciation	$ 4,245
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 131-135 Prince Street Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 57,536
Increase (Decrease) in Net Investments	242
Carrying Amount of Buildings and Improvements	57,778
Total Carrying Amount	57,778
Accumulated Depreciation	$ 11,605
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Shops at Grand Ave Queens, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 20,264
Initial Cost to Company of Buildings and Improvements	33,131
Increase (Decrease) in Net Investments	1,965
Carrying Amount of Land	20,264
Carrying Amount of Buildings and Improvements	35,096
Total Carrying Amount	55,360
Accumulated Depreciation	$ 3,651
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 201 Needham St. Newton, MA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,550
Initial Cost to Company of Buildings and Improvements	4,459
Increase (Decrease) in Net Investments	105
Carrying Amount of Land	4,550
Carrying Amount of Buildings and Improvements	4,564
Total Carrying Amount	9,114
Accumulated Depreciation	$ 536
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | City Center San Francisco, CA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 36,063
Initial Cost to Company of Buildings and Improvements	109,098
Increase (Decrease) in Net Investments	16,814
Carrying Amount of Land	36,063
Carrying Amount of Buildings and Improvements	125,912
Total Carrying Amount	161,975
Accumulated Depreciation	$ 10,585
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 163 Highland Avenue Needham, MA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 8,852
Initial Cost to Company of Land	12,679
Initial Cost to Company of Buildings and Improvements	11,213
Carrying Amount of Land	12,679
Carrying Amount of Buildings and Improvements	11,213
Total Carrying Amount	23,892
Accumulated Depreciation	$ 1,198
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Roosevelt Galleria Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,838
Initial Cost to Company of Buildings and Improvements	14,574
Increase (Decrease) in Net Investments	13
Carrying Amount of Land	4,838
Carrying Amount of Buildings and Improvements	14,587
Total Carrying Amount	19,425
Accumulated Depreciation	$ 1,223
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Route 202 Shopping Center Wilmington, DE
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 6,346
Increase (Decrease) in Net Investments	501
Carrying Amount of Buildings and Improvements	6,847
Total Carrying Amount	6,847
Accumulated Depreciation	$ 673
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 991 Madison Avenue New York, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Buildings and Improvements	$ 76,965
Increase (Decrease) in Net Investments	1,506
Carrying Amount of Buildings and Improvements	78,471
Total Carrying Amount	78,471
Accumulated Depreciation	$ 4,413
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 165 Newbury Street - Boston, MA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,918
Initial Cost to Company of Buildings and Improvements	3,980
Carrying Amount of Land	1,918
Carrying Amount of Buildings and Improvements	3,980
Total Carrying Amount	5,898
Accumulated Depreciation	$ 265
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Concord & Milwaukee - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 2,728
Initial Cost to Company of Land	2,739
Initial Cost to Company of Buildings and Improvements	2,746
Carrying Amount of Land	2,739
Carrying Amount of Buildings and Improvements	2,746
Total Carrying Amount	5,485
Accumulated Depreciation	$ 175
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | State & Washington - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 24,439
Initial Cost to Company of Land	3,907
Initial Cost to Company of Buildings and Improvements	70,943
Increase (Decrease) in Net Investments	20
Carrying Amount of Land	3,907
Carrying Amount of Buildings and Improvements	70,963
Total Carrying Amount	74,870
Accumulated Depreciation	$ 4,138
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 151 North State Street - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 13,882
Initial Cost to Company of Land	1,941
Initial Cost to Company of Buildings and Improvements	25,529
Carrying Amount of Land	1,941
Carrying Amount of Buildings and Improvements	25,529
Total Carrying Amount	27,470
Accumulated Depreciation	$ 1,542
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | North & Kingsbury - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 12,555
Initial Cost to Company of Land	18,731
Initial Cost to Company of Buildings and Improvements	16,292
Increase (Decrease) in Net Investments	52
Carrying Amount of Land	18,731
Carrying Amount of Buildings and Improvements	16,344
Total Carrying Amount	35,075
Accumulated Depreciation	$ 989
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Sullivan Center - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 50,000
Initial Cost to Company of Land	13,443
Initial Cost to Company of Buildings and Improvements	137,327
Increase (Decrease) in Net Investments	419
Carrying Amount of Land	13,443
Carrying Amount of Buildings and Improvements	137,746
Total Carrying Amount	151,189
Accumulated Depreciation	$ 8,052
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | California & Armitage - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 2,566
Initial Cost to Company of Land	6,770
Initial Cost to Company of Buildings and Improvements	2,292
Increase (Decrease) in Net Investments	2
Carrying Amount of Land	6,770
Carrying Amount of Buildings and Improvements	2,294
Total Carrying Amount	9,064
Accumulated Depreciation	$ 148
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | 555 9th Street - San Francisco, CA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 60,000
Initial Cost to Company of Land	75,591
Initial Cost to Company of Buildings and Improvements	73,268
Increase (Decrease) in Net Investments	1
Carrying Amount of Land	75,591
Carrying Amount of Buildings and Improvements	73,269
Total Carrying Amount	148,860
Accumulated Depreciation	$ 4,000
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Market Square Wilmington, DE
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 8,100
Initial Cost to Company of Buildings and Improvements	31,221
Increase (Decrease) in Net Investments	228
Carrying Amount of Land	8,100
Carrying Amount of Buildings and Improvements	31,449
Total Carrying Amount	39,549
Accumulated Depreciation	$ 937
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Core Portfolio | Undeveloped Land
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 100
Carrying Amount of Land	100
Total Carrying Amount	100
Opportunity Funds | Fund II | City Point Brooklyn, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	224,587
Initial Cost to Company of Buildings and Improvements	100,316
Increase (Decrease) in Net Investments	468,337
Carrying Amount of Buildings and Improvements	568,653
Total Carrying Amount	568,653
Accumulated Depreciation	$ 29,640
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund III | 654 Broadway Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 9,040
Initial Cost to Company of Buildings and Improvements	3,654
Increase (Decrease) in Net Investments	3,497
Carrying Amount of Land	9,040
Carrying Amount of Buildings and Improvements	7,151
Total Carrying Amount	16,191
Accumulated Depreciation	$ 1,209
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund III | 640 Broadway Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 49,470
Initial Cost to Company of Land	12,503
Initial Cost to Company of Buildings and Improvements	19,960
Increase (Decrease) in Net Investments	14,304
Carrying Amount of Land	12,503
Carrying Amount of Buildings and Improvements	34,264
Total Carrying Amount	46,767
Accumulated Depreciation	$ 5,798
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund III | Cortlandt Crossing Mohegan Lake, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 26,000
Initial Cost to Company of Land	11,000
Increase (Decrease) in Net Investments	64,870
Carrying Amount of Land	12,750
Carrying Amount of Buildings and Improvements	63,120
Total Carrying Amount	75,870
Accumulated Depreciation	$ 415
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund III | 3104 M St. Washington, DC
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 4,531
Initial Cost to Company of Land	750
Initial Cost to Company of Buildings and Improvements	2,115
Increase (Decrease) in Net Investments	5,162
Carrying Amount of Land	750
Carrying Amount of Buildings and Improvements	7,277
Total Carrying Amount	8,027
Accumulated Depreciation	$ 566
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund III | 3780-3858 Nostrand Avenue Brooklyn, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 10,097
Initial Cost to Company of Land	6,229
Initial Cost to Company of Buildings and Improvements	11,216
Increase (Decrease) in Net Investments	6,365
Carrying Amount of Land	6,229
Carrying Amount of Buildings and Improvements	17,581
Total Carrying Amount	23,810
Accumulated Depreciation	$ 2,857
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 210 Bowery Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 1,875
Initial Cost to Company of Buildings and Improvements	5,625
Increase (Decrease) in Net Investments	6,021
Carrying Amount of Land	1,875
Carrying Amount of Buildings and Improvements	11,646
Total Carrying Amount	13,521
Accumulated Depreciation	$ 26
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Paramus Plaza Paramus, NJ
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 17,627
Initial Cost to Company of Land	11,052
Initial Cost to Company of Buildings and Improvements	7,037
Increase (Decrease) in Net Investments	11,934
Carrying Amount of Land	11,052
Carrying Amount of Buildings and Improvements	18,971
Total Carrying Amount	30,023
Accumulated Depreciation	$ 2,836
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 938 W. North Avenue Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 14,100
Initial Cost to Company of Land	2,314
Initial Cost to Company of Buildings and Improvements	17,067
Increase (Decrease) in Net Investments	5,362
Carrying Amount of Land	2,314
Carrying Amount of Buildings and Improvements	22,429
Total Carrying Amount	24,743
Accumulated Depreciation	$ 2,473
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 27 E. 61st Street Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,813
Initial Cost to Company of Buildings and Improvements	14,438
Increase (Decrease) in Net Investments	7,100
Carrying Amount of Land	4,813
Carrying Amount of Buildings and Improvements	21,538
Total Carrying Amount	26,351
Accumulated Depreciation	$ 666
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 17 E. 71st Street Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 18,906
Initial Cost to Company of Land	7,391
Initial Cost to Company of Buildings and Improvements	20,176
Increase (Decrease) in Net Investments	280
Carrying Amount of Land	7,391
Carrying Amount of Buildings and Improvements	20,456
Total Carrying Amount	27,847
Accumulated Depreciation	$ 2,211
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 1035 Third Ave Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 38,434
Initial Cost to Company of Land	12,759
Initial Cost to Company of Buildings and Improvements	37,431
Increase (Decrease) in Net Investments	5,386
Carrying Amount of Land	14,099
Carrying Amount of Buildings and Improvements	41,477
Total Carrying Amount	55,576
Accumulated Depreciation	$ 4,222
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 801 Madison Avenue Manhattan, NY
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 4,178
Initial Cost to Company of Buildings and Improvements	28,470
Increase (Decrease) in Net Investments	5,608
Carrying Amount of Land	4,178
Carrying Amount of Buildings and Improvements	34,078
Total Carrying Amount	38,256
Accumulated Depreciation	$ 1,054
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 2208-2216 Fillmore Street San Francisco, CA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 5,606
Initial Cost to Company of Land	3,027
Initial Cost to Company of Buildings and Improvements	6,376
Increase (Decrease) in Net Investments	32
Carrying Amount of Land	3,027
Carrying Amount of Buildings and Improvements	6,408
Total Carrying Amount	9,435
Accumulated Depreciation	$ 511
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 146 Geary Street San Francisco, CA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 27,700
Initial Cost to Company of Land	9,500
Initial Cost to Company of Buildings and Improvements	28,500
Increase (Decrease) in Net Investments	489
Carrying Amount of Land	9,500
Carrying Amount of Buildings and Improvements	28,989
Total Carrying Amount	38,489
Accumulated Depreciation	$ 2,257
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 2207 Fillmore Street San Francisco, CA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 1,120
Initial Cost to Company of Land	1,498
Initial Cost to Company of Buildings and Improvements	1,735
Increase (Decrease) in Net Investments	118
Carrying Amount of Land	1,498
Carrying Amount of Buildings and Improvements	1,853
Total Carrying Amount	3,351
Accumulated Depreciation	$ 143
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 1964 Union Street San Francisco, CA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 1,463
Initial Cost to Company of Land	563
Initial Cost to Company of Buildings and Improvements	1,688
Increase (Decrease) in Net Investments	1,867
Carrying Amount of Land	563
Carrying Amount of Buildings and Improvements	3,555
Total Carrying Amount	4,118
Accumulated Depreciation	$ 121
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Restaurants at Fort Point - Boston, MA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 6,201
Initial Cost to Company of Land	1,041
Initial Cost to Company of Buildings and Improvements	10,905
Carrying Amount of Land	1,041
Carrying Amount of Buildings and Improvements	10,905
Total Carrying Amount	11,946
Accumulated Depreciation	$ 818
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Wake Forest Crossing - Wake Forest, NC
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 23,706
Initial Cost to Company of Land	7,570
Initial Cost to Company of Buildings and Improvements	24,829
Increase (Decrease) in Net Investments	220
Carrying Amount of Land	7,570
Carrying Amount of Buildings and Improvements	25,049
Total Carrying Amount	32,619
Accumulated Depreciation	$ 1,799
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Airport Mall - Bangor, ME
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 5,476
Initial Cost to Company of Land	2,294
Initial Cost to Company of Buildings and Improvements	7,067
Increase (Decrease) in Net Investments	458
Carrying Amount of Land	2,294
Carrying Amount of Buildings and Improvements	7,525
Total Carrying Amount	9,819
Accumulated Depreciation	$ 526
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Colonie Plaza - Albany, NY
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 11,890
Initial Cost to Company of Land	2,852
Initial Cost to Company of Buildings and Improvements	9,619
Increase (Decrease) in Net Investments	271
Carrying Amount of Land	2,852
Carrying Amount of Buildings and Improvements	9,890
Total Carrying Amount	12,742
Accumulated Depreciation	$ 632
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Dauphin Plaza - Harrisburg, PA
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 10,021
Initial Cost to Company of Land	5,290
Initial Cost to Company of Buildings and Improvements	9,464
Increase (Decrease) in Net Investments	2,235
Carrying Amount of Land	5,290
Carrying Amount of Buildings and Improvements	11,699
Total Carrying Amount	16,989
Accumulated Depreciation	$ 793
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | JFK Plaza - Waterville, ME
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 4,381
Initial Cost to Company of Land	751
Initial Cost to Company of Buildings and Improvements	5,991
Increase (Decrease) in Net Investments	9
Carrying Amount of Land	751
Carrying Amount of Buildings and Improvements	6,000
Total Carrying Amount	6,751
Accumulated Depreciation	$ 412
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Mayfair Shopping Center - Philadelphia, PA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 6,178
Initial Cost to Company of Buildings and Improvements	9,266
Increase (Decrease) in Net Investments	741
Carrying Amount of Land	6,178
Carrying Amount of Buildings and Improvements	10,007
Total Carrying Amount	16,185
Accumulated Depreciation	$ 602
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Shaw's Plaza Waterville, ME
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 7,840
Initial Cost to Company of Land	828
Initial Cost to Company of Buildings and Improvements	11,814
Increase (Decrease) in Net Investments	56
Carrying Amount of Land	828
Carrying Amount of Buildings and Improvements	11,870
Total Carrying Amount	12,698
Accumulated Depreciation	$ 721
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Wells Plaza - Wells, ME
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 3,286
Initial Cost to Company of Land	1,892
Initial Cost to Company of Buildings and Improvements	2,585
Increase (Decrease) in Net Investments	236
Carrying Amount of Land	1,892
Carrying Amount of Buildings and Improvements	2,821
Total Carrying Amount	4,713
Accumulated Depreciation	$ 245
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | 717 N Michigan - Chicago, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 18,972
Initial Cost to Company of Land	20,674
Initial Cost to Company of Buildings and Improvements	10,093
Increase (Decrease) in Net Investments	1
Carrying Amount of Land	20,674
Carrying Amount of Buildings and Improvements	10,094
Total Carrying Amount	30,768
Accumulated Depreciation	$ 523
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Shaw's Plaza North Windham, ME
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 5,848
Initial Cost to Company of Land	1,876
Initial Cost to Company of Buildings and Improvements	6,696
Increase (Decrease) in Net Investments	1
Carrying Amount of Land	1,876
Carrying Amount of Buildings and Improvements	6,697
Total Carrying Amount	8,573
Accumulated Depreciation	$ 281
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | Lincoln Place Fairview Heights, IL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 23,100
Initial Cost to Company of Land	7,149
Initial Cost to Company of Buildings and Improvements	22,201
Increase (Decrease) in Net Investments	920
Carrying Amount of Land	7,149
Carrying Amount of Buildings and Improvements	23,121
Total Carrying Amount	30,270
Accumulated Depreciation	$ 1,218
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund IV | BSP I
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 19,773
Initial Cost to Company of Land	9,930
Initial Cost to Company of Buildings and Improvements	21,905
Carrying Amount of Land	9,930
Carrying Amount of Buildings and Improvements	21,905
Total Carrying Amount	31,835
Accumulated Depreciation	$ 136
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | Plaza Santa Fe Santa Fe, NM
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 22,893
Initial Cost to Company of Buildings and Improvements	28,214
Increase (Decrease) in Net Investments	69
Carrying Amount of Buildings and Improvements	28,283
Total Carrying Amount	28,283
Accumulated Depreciation	$ 1,228
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | Hickory Ridge - Hickory, NC
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 28,613
Initial Cost to Company of Land	7,852
Initial Cost to Company of Buildings and Improvements	29,998
Increase (Decrease) in Net Investments	75
Carrying Amount of Land	7,852
Carrying Amount of Buildings and Improvements	30,073
Total Carrying Amount	37,925
Accumulated Depreciation	$ 1,166
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | New Towne Plaza - Canton, MI
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 16,900
Initial Cost to Company of Land	5,040
Initial Cost to Company of Buildings and Improvements	17,391
Increase (Decrease) in Net Investments	106
Carrying Amount of Land	5,040
Carrying Amount of Buildings and Improvements	17,497
Total Carrying Amount	22,537
Accumulated Depreciation	$ 713
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | Fairlane Green Allen Park, MI
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 40,300
Initial Cost to Company of Land	18,121
Initial Cost to Company of Buildings and Improvements	37,143
Increase (Decrease) in Net Investments	247
Carrying Amount of Land	18,121
Carrying Amount of Buildings and Improvements	37,390
Total Carrying Amount	55,511
Accumulated Depreciation	$ 1,026
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | Trussville Promenade Birmingham, AL
Real Estate And Accumulated Depreciation [Line Items]
Encumbrances	$ 29,370
Initial Cost to Company of Land	7,587
Initial Cost to Company of Buildings and Improvements	34,285
Carrying Amount of Land	7,587
Carrying Amount of Buildings and Improvements	34,285
Total Carrying Amount	41,872
Accumulated Depreciation	$ 778
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | Elk Grove Commons Elk Grove, CA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 6,204
Initial Cost to Company of Buildings and Improvements	48,008
Increase (Decrease) in Net Investments	28
Carrying Amount of Land	6,204
Carrying Amount of Buildings and Improvements	48,036
Total Carrying Amount	54,240
Accumulated Depreciation	$ 525
Life on which Depreciation in Latest Statement of Income is Compared	40 years
Opportunity Funds | Fund V | Hiram Pavilion I & II Hiram, GA
Real Estate And Accumulated Depreciation [Line Items]
Initial Cost to Company of Land	$ 13,029
Initial Cost to Company of Buildings and Improvements	25,446
Increase (Decrease) in Net Investments	27
Carrying Amount of Land	13,029
Carrying Amount of Buildings and Improvements	25,473
Total Carrying Amount	38,502
Accumulated Depreciation	$ 137
Life on which Depreciation in Latest Statement of Income is Compared	40 years

SCHEDULE III - REAL ESTATE AN_3

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of year	$ 3,466,482	$ 3,382,000	$ 2,736,283
Other improvements	100,077	55,763	152,129
Property acquisitions	134,559	179,292	761,400
Property dispositions or held for sale assets	(34,666)	(189,895)	(134,332)
Other	(483)		(9,844)
Deconsolidation of previously consolidated investments			(123,636)
Consolidation of previously unconsolidated investments	31,836	39,322
Balance at end of year	$ 3,697,805	$ 3,466,482	$ 3,382,000

SCHEDULE III - REAL ESTATE AN_4

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of year	$ 339,862	$ 287,066	$ 298,703
Depreciation related to real estate	78,453	73,268	49,269
Property dispositions	(1,658)	(20,472)	(27,829)
Deconsolidation of previously consolidated investments			(33,077)
Balance at end of year	$ 416,657	$ 339,862	$ 287,066

SCHEDULE IV - MORTGAGE LOANS _2

SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Loans On Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Face Amount of Notes Receivable	$ 215,200
Net carrying amount of notes receivable	$ 109,613	$ 153,829	$ 276,163	$ 147,188
First Mortgage Loan, 6.0% Loan, Due 4/30/2020
Mortgage Loans on Real Estate [Line Items]
Effective Interest Rate	6.00%
Face Amount of Notes Receivable	$ 15,000
Net carrying amount of notes receivable	$ 17,802
First Mortgage Loan, 8.1% Loan, Due 4/30/2019
Mortgage Loans on Real Estate [Line Items]
Effective Interest Rate	8.10%
Face Amount of Notes Receivable	$ 153,400
Net carrying amount of notes receivable	$ 38,673
Zero Coupon Loan Due 5/31/2020
Mortgage Loans on Real Estate [Line Items]
Effective Interest Rate	2.50%
Face Amount of Notes Receivable	$ 29,793
Net carrying amount of notes receivable	$ 32,582
Mezzanine Loan 18.0% Loan Due 7/1/2020
Mortgage Loans on Real Estate [Line Items]
Effective Interest Rate	18.00%
Face Amount of Notes Receivable	$ 3,007
Net carrying amount of notes receivable	$ 5,306
Preferred Equity, 15.3% Loan, Due 2/3/2021
Mortgage Loans on Real Estate [Line Items]
Effective Interest Rate	15.30%
Face Amount of Notes Receivable	$ 14,000
Net carrying amount of notes receivable	$ 15,250

SCHEDULE IV - MORTGAGE LOANS _3

SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Reconciliation of Loans on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 153,829	$ 276,163	$ 147,188
Additions	3,805	11,371	171,794
Repayments	(26,000)	(32,000)	(42,819)
Conversion to real estate through receipt of deed	(22,021)	(101,705)
Balance at end of year	$ 109,613	$ 153,829	$ 276,163