Washington Prime (WPGGQ) 10-K 21 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 20, 2019	Jun. 29, 2018
Document Information [Line Items]
Entity Registrant Name	WASHINGTON PRIME GROUP INC.
Entity Central Index Key	1,594,686
Trading Symbol	wpg
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		186,074,461
Entity Public Float			$ 1.5
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 Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Washington Prime Group, L.P. [Member]
Document Information [Line Items]
Entity Registrant Name	Washington Prime Group, L.P.
Entity Central Index Key	1,610,911
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS:
Investment properties at cost	$ 5,914,705	$ 5,807,760
Less: accumulated depreciation	2,283,764	2,139,620
Investment properties at cost, net	3,630,941	3,668,140
Cash and cash equivalents	42,542	52,019
Tenant receivables and accrued revenue, net	85,463	90,314
Investment in and advances to unconsolidated entities, at equity	433,207	451,839
Deferred costs and other assets	169,135	189,095
Total assets	4,361,288	4,451,407
LIABILITIES:
Mortgage notes payable	983,269	1,157,082
Notes payable	982,697	979,372
Unsecured term loans	685,509	606,695
Revolving credit facility	286,002	154,460
Accounts payable, accrued expenses, intangibles, and deferred revenues	253,862	264,998
Distributions payable	2,992	2,992
Cash distributions and losses in unconsolidated entities, at equity	15,421	15,421
Total liabilities	3,209,752	3,181,020
Redeemable noncontrolling interests	3,265	3,265
Stockholders' Equity:
Common stock, $0.0001 par value, 350,000,000 shares authorized; 186,074,461 and 185,791,421 issued and outstanding as of December 31, 2018 and 2017, respectively	19	19
Capital in excess of par value	1,247,639	1,240,483
Accumulated deficit	(456,924)	(350,594)
Accumulated other comprehensive income	6,400	6,920
Total stockholders' equity	999,710	1,099,404
Noncontrolling interests	148,561	167,718
Total equity	1,148,271	1,267,122
Partners' Equity:
Total liabilities, redeemable noncontrolling interests and equity	4,361,288	4,451,407
Series H Preferred Stock [Member]
Stockholders' Equity:
Cumulative redeemable preferred stock	104,251	104,251
Series I Preferred Stock [Member]
Stockholders' Equity:
Cumulative redeemable preferred stock	98,325	98,325
Washington Prime Group, L.P. [Member]
ASSETS:
Investment properties at cost	5,914,705	5,807,760
Less: accumulated depreciation	2,283,764	2,139,620
Investment properties at cost, net	3,630,941	3,668,140
Cash and cash equivalents	42,542	52,019
Tenant receivables and accrued revenue, net	85,463	90,314
Investment in and advances to unconsolidated entities, at equity	433,207	451,839
Deferred costs and other assets	169,135	189,095
Total assets	4,361,288	4,451,407
LIABILITIES:
Mortgage notes payable	983,269	1,157,082
Notes payable	982,697	979,372
Unsecured term loans	685,509	606,695
Revolving credit facility	286,002	154,460
Accounts payable, accrued expenses, intangibles, and deferred revenues	253,862	264,998
Distributions payable	2,992	2,992
Cash distributions and losses in unconsolidated entities, at equity	15,421	15,421
Total liabilities	3,209,752	3,181,020
Redeemable noncontrolling interests	3,265	3,265
Partners' Equity:
General Partners' Capital Account	999,710	1,099,404
Limited partners, 34,755,660 and 34,760,026 units issued and outstanding as of December 31, 2018 and 2017, respectively	147,493	166,660
Total partners' equity	1,147,203	1,266,064
Noncontrolling interests	1,068	1,058
Total equity	1,148,271	1,267,122
Total liabilities, redeemable noncontrolling interests and equity	4,361,288	4,451,407
Washington Prime Group, L.P. [Member] | General Partner Preferred Equity [Member]
Partners' Equity:
General Partners' Capital Account	202,576	202,576
Washington Prime Group, L.P. [Member] | General Partner Common Equity [Member]
Partners' Equity:
General Partners' Capital Account	$ 797,134	$ 896,828

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	350,000,000	300,000,000
Common stock, issued (in shares)	186,074,461	185,797,421
Common stock, outstanding (in shares)	186,074,461	185,797,421
Washington Prime Group, L.P. [Member]
Limited Partner, common equity, shares issued (in shares)	34,755,660	34,760,026
Limited Partner, common equity, shares outstanding (in shares)	34,755,660	34,760,026
Washington Prime Group, L.P. [Member] | General Partner Preferred Equity [Member]
General Partner shares issued (in shares)	7,800,000	7,800,000
General Partner shares outstanding (in shares)	7,800,000	7,800,000
Washington Prime Group, L.P. [Member] | General Partner Common Equity [Member]
General Partner shares issued (in shares)	186,074,461	185,791,421
General Partner shares outstanding (in shares)	186,074,461	185,791,421
Series H Preferred Stock [Member]
Preferred Shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred shares, shares issued (in shares)	4,000,000	4,000,000
Preferred Shares, shares outstanding (in shares)	4,000,000	4,000,000
Series I Preferred Stock [Member]
Preferred Shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred shares, shares issued (in shares)	3,800,000	3,800,000
Preferred Shares, shares outstanding (in shares)	3,800,000	3,800,000

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUE:
Minimum rent	$ 492,169	$ 516,386	$ 572,781
Overage rent	9,313	9,115	12,882
Tenant reimbursements	191,319	208,290	236,510
Other income	30,504	24,331	21,302
Total revenues	723,305	758,122	843,475
EXPENSES:
Property operating	148,433	146,529	166,690
Depreciation and amortization	257,796	258,740	281,150
Real estate taxes	86,665	89,617	102,638
Advertising and promotion	9,070	9,107	10,375
Provision for credit losses	5,826	5,068	4,508
General and administrative	39,090	34,892	37,317
Merger, restructuring and transaction costs	0	0	29,607
Ground rent	789	2,438	4,318
Impairment loss	0	66,925	21,879
Total operating expenses	547,669	613,316	658,482
Interest expense, net	(141,987)	(126,541)	(136,225)
Gain (loss) on disposition of interests in properties, net	24,602	124,771	(1,987)
Gain on extinguishment of debt, net	51,395	90,579	34,612
Income and other taxes	(1,532)	(3,417)	(2,232)
Income (loss) from unconsolidated entities	541	1,395	(1,745)
NET INCOME	108,655	231,593	77,416
Net income attributable to noncontrolling interests	15,051	34,530	10,285
NET INCOME ATTRIBUTABLE TO THE COMPANY	93,604	197,063	67,131
Less: Preferred share dividends	(14,032)	(14,032)	(14,032)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 79,572	$ 183,031	$ 53,099
EARNINGS (LOSS) PER COMMON SHARE, BASIC AND DILUTED (usd per share)	$ 0.42	$ 0.98	$ 0.29
Net Income Loss Attributable to Common Unitholders [Abstract]
Net Income (Loss) Allocated to Limited Partners	$ 14,735	$ 34,222	$ 10,034
COMPREHENSIVE INCOME:
NET INCOME	108,655	231,593	77,416
Unrealized (loss) income on interest rate derivative instruments	(1,284)	2,401	3,801
Comprehensive income	107,371	233,994	81,217
Comprehensive income attributable to noncontrolling interests	14,871	34,927	10,886
Comprehensive income attributable to common shareholders	92,500	199,067	70,331
Washington Prime Group, L.P. [Member]
REVENUE:
Minimum rent	492,169	516,386	572,781
Overage rent	9,313	9,115	12,882
Tenant reimbursements	191,319	208,290	236,510
Other income	30,504	24,331	21,302
Total revenues	723,305	758,122	843,475
EXPENSES:
Property operating	148,433	146,529	166,690
Depreciation and amortization	257,796	258,740	281,150
Real estate taxes	86,665	89,617	102,638
Advertising and promotion	9,070	9,107	10,375
Provision for credit losses	5,826	5,068	4,508
General and administrative	39,090	34,892	37,317
Merger, restructuring and transaction costs	0	0	29,607
Ground rent	789	2,438	4,318
Impairment loss	0	66,925	21,879
Total operating expenses	547,669	613,316	658,482
Interest expense, net	(141,987)	(126,541)	(136,225)
Gain (loss) on disposition of interests in properties, net	24,602	124,771	(1,987)
Gain on extinguishment of debt, net	51,395	90,579	34,612
Income and other taxes	(1,532)	(3,417)	(2,232)
Income (loss) from unconsolidated entities	541	1,395	(1,745)
NET INCOME	108,655	231,593	77,416
Net income attributable to noncontrolling interests	$ 76	$ 68	$ 11
EARNINGS (LOSS) PER COMMON SHARE, BASIC AND DILUTED (usd per share)	$ 0.42	$ 0.98	$ 0.29
NET INCOME ATTRIBUTABLE TO UNITHOLDERS	$ 108,579	$ 231,525	$ 77,405
Less: Preferred unit distributions	(14,272)	(14,272)	(14,272)
NET INCOME ATTRIBUTABLE TO COMMON UNITHOLDERS	94,307	217,253	63,133
Net Income Loss Attributable to Common Unitholders [Abstract]
General partner	79,572	183,031	53,099
Net Income (Loss) Allocated to Limited Partners	14,735	34,222	10,034
NET INCOME ATTRIBUTABLE TO COMMON UNITHOLDERS	94,307	217,253	63,133
COMPREHENSIVE INCOME:
NET INCOME	108,655	231,593	77,416
Unrealized (loss) income on interest rate derivative instruments	(1,284)	2,401	3,801
Comprehensive income	107,371	233,994	81,217
Comprehensive income attributable to noncontrolling interests	76	68	11
Comprehensive income attributable to common shareholders	$ 107,295	$ 233,926	$ 81,206

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 INCOME	$ 108,655	$ 231,593	$ 77,416
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including fair value rent, fair value debt, deferred financing costs and equity-based compensation	259,022	259,167	284,960
Gain on extinguishment of debt, net	(51,395)	(90,579)	(34,612)
(Gain) loss on disposition of interests in properties and outparcels, net	(24,602)	(125,063)	1,987
Impairment loss	0	66,925	21,879
Provision for credit losses	5,826	5,068	4,508
(Income) loss from unconsolidated entities	(541)	(1,395)	1,745
Distributions of income from unconsolidated entities	8,619	1,873	804
Changes in assets and liabilities:
Tenant receivables and accrued revenue, net	327	2,309	(14,054)
Deferred costs and other assets	(23,087)	(21,209)	(14,397)
Accounts payable, accrued expenses, deferred revenues and other liabilities	4,421	(4,058)	(41,249)
Net cash provided by operating activities	287,245	324,631	288,987
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions, net of cash acquired	(80,108)	0	0
Capital expenditures, net	(153,850)	(147,329)	(173,593)
Net proceeds from disposition of interests in properties and outparcels	39,212	218,801	22,653
Investments in unconsolidated entities	(20,178)	(50,911)	(11,631)
Distributions of capital from unconsolidated entities	35,096	73,289	38,086
Net cash (used in) provided by investing activities	(179,828)	93,850	(124,485)
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to noncontrolling interest holders in properties	(66)	(114)	0
Redemption of limited partner units/preferred shares	(28)	(251)	(6)
Net proceeds from issuance of common shares, including common stock plans	0	13	512
Distributions to redeemable noncontrolling interest	0	0	(24)
Purchase of redeemable noncontrolling interest	0	(6,830)	(339)
Distributions on common and preferred shares/units	(236,821)	(236,152)	(235,092)
Proceeds from issuance of debt, net of transaction costs	708,563	1,293,322	206,740
Repayments of debt	(588,182)	(1,486,781)	(202,939)
Net cash used in financing activities	(116,534)	(436,793)	(231,148)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(9,117)	(18,312)	(66,646)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of year	70,201	88,513	155,159
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of year	61,084	70,201	88,513
Washington Prime Group, L.P. [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	108,655	231,593	77,416
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including fair value rent, fair value debt, deferred financing costs and equity-based compensation	259,022	259,167	284,960
Gain on extinguishment of debt, net	(51,395)	(90,579)	(34,612)
(Gain) loss on disposition of interests in properties and outparcels, net	(24,602)	(125,063)	1,987
Impairment loss	0	66,925	21,879
Provision for credit losses	5,826	5,068	4,508
(Income) loss from unconsolidated entities	(541)	(1,395)	1,745
Distributions of income from unconsolidated entities	8,619	1,873	804
Changes in assets and liabilities:
Tenant receivables and accrued revenue, net	327	2,309	(14,054)
Deferred costs and other assets	(23,087)	(21,209)	(14,397)
Accounts payable, accrued expenses, deferred revenues and other liabilities	4,421	(4,058)	(41,249)
Net cash provided by operating activities	287,245	324,631	288,987
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions, net of cash acquired	(80,108)	0	0
Capital expenditures, net	(153,850)	(147,329)	(173,593)
Net proceeds from disposition of interests in properties and outparcels	39,212	218,801	22,653
Investments in unconsolidated entities	(20,178)	(50,911)	(11,631)
Distributions of capital from unconsolidated entities	35,096	73,289	38,086
Net cash (used in) provided by investing activities	(179,828)	93,850	(124,485)
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to noncontrolling interest holders in properties	(66)	(114)	0
Redemption of limited partner units/preferred shares	(28)	(251)	(6)
Net proceeds from issuance of common units, including equity-based compensation plans	0	13	512
Distributions to redeemable noncontrolling interest	0	0	(24)
Purchase of redeemable noncontrolling interest	0	(6,830)	(339)
Distributions to unitholders, net	(236,821)	(236,152)	(235,092)
Proceeds from issuance of debt, net of transaction costs	708,563	1,293,322	206,740
Repayments of debt	(588,182)	(1,486,781)	(202,939)
Net cash used in financing activities	(116,534)	(436,793)	(231,148)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(9,117)	(18,312)	(66,646)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of year	70,201	88,513
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of year	$ 61,084	$ 70,201	$ 88,513

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Total Stockholders' Equity [Member]	Preferred Stock [Member]Series H Preferred Stock [Member]	Preferred Stock [Member]Series I Preferred Stock [Member]	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interests [Member]	Redeemable Non-Controlling Interests [Member]
Balance at Dec. 31, 2015	$ 1,407,373	$ 1,215,994	$ 104,251	$ 98,325	$ 19	$ 1,225,926	$ (214,243)	$ 1,716	$ 191,379	$ 6,132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	512	512				512
Redemption of limited partner units	(6)								(6)
Other	151	151				151				(925)
Adjustment of redemption value for redeemable noncontrolling interest	(5,464)	(5,464)				(5,464)				5,464
Equity-based compensation	14,109	9,506				9,506			4,603
Adjustments to noncontrolling interests		2,007				2,007			(2,007)
Distributions on common shares/units ($1.00 per common share/unit)	(220,820)	(185,562)					(185,562)		(35,258)
Distributions declared on preferred shares	(14,032)	(14,032)					(14,032)
Other comprehensive income	3,801	3,200						3,200	601
Net income (loss), excluding $240 of distributions to preferred unitholders	77,187	67,131					67,131		10,056	(11)
Balance at Dec. 31, 2016	1,262,811	1,093,443	104,251	98,325	19	1,232,638	(346,706)	4,916	169,368	10,660
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	13	13				13
Redemption of limited partner units	(251)								(251)
Exchange of limited partner units		2,463				2,463			(2,463)
Other	(146)	(146)				(146)
Equity-based compensation	6,402	5,280				5,280			1,122
Adjustments to noncontrolling interests		(330)				(330)			330
Purchase of redeemable noncontrolling interest	565	565				565				(7,395)
Distributions on common shares/units ($1.00 per common share/unit)	(221,994)	(186,919)					(186,919)		(35,075)
Distributions declared on preferred shares	(14,032)	(14,032)					(14,032)
Other comprehensive income	2,401	2,004						2,004	397
Net income (loss), excluding $240 of distributions to preferred unitholders	231,353	197,063					197,063		34,290
Balance at Dec. 31, 2017	1,267,122	1,099,404	104,251	98,325	19	1,240,483	(350,594)	6,920	167,718	3,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of limited partner units	(28)								(28)
Other	(103)	(103)				(103)
Equity-based compensation	8,322	7,480				7,480			842
Adjustments to noncontrolling interests	0	168				168			(168)
Distributions on common shares/units ($1.00 per common share/unit)	(222,615)	(187,792)					(187,792)		(34,823)
Distributions declared on preferred shares	(14,032)	(14,032)					(14,032)
Other comprehensive income	(1,284)	(1,104)						(1,104)	(180)
Net income (loss), excluding $240 of distributions to preferred unitholders	108,415	93,604					93,604		14,811
Balance at Dec. 31, 2018	$ 1,148,271	$ 999,710	$ 104,251	$ 98,325	$ 19	$ 1,247,639	$ (456,924)	$ 6,400	$ 148,561	$ 3,265

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Distributions on common shares/units, per common share/unit (in dollars per share)	$ 1	$ 1	$ 1
Distributions to preferred unitholders	$ 240	$ 240	$ 229

Consolidated Statements of Eq_3

Consolidated Statements of Equity - LP - USD ($) $ in Thousands	Total	Washington Prime Group, L.P. [Member]	Washington Prime Group, L.P. [Member]Partners' Equity [Member]	Washington Prime Group, L.P. [Member]Non- Controlling Interests [Member]	Washington Prime Group, L.P. [Member]Redeemable Noncontrolling Interests [Member]	Washington Prime Group, L.P. [Member]General PartnerPartners' Equity [Member]	Washington Prime Group, L.P. [Member]General Partner Preferred Equity [Member]Partners' Equity [Member]	Washington Prime Group, L.P. [Member]General Partner Common Equity [Member]Partners' Equity [Member]	Washington Prime Group, L.P. [Member]Limited Partners [Member]Partners' Equity [Member]
Balance at Dec. 31, 2015		$ 1,407,373	$ 1,406,291	$ 1,082	$ 6,132	$ 1,215,994	$ 202,576	$ 1,013,418	$ 190,297
Increase (Decrease) in Partners' Capital [Roll Forward]
Exercise of stock options	$ 512	512	512			512		512
Redemption of limited partner units	(6)	(6)	(6)						(6)
Other		151	151		(925)	151		151
Adjustment of redemption value for redeemable noncontrolling interest	(5,464)	(5,464)	(5,464)		5,464	(5,464)		(5,464)
Equity-based compensation		14,109	14,109			9,506		9,506	4,603
Adjustments to limited partners' interests						2,007		2,007	(2,007)
Distributions to common unitholders, net		(220,820)	(220,820)			(185,562)		(185,562)	(35,258)
Distributions declared on preferred units		(14,032)	(14,032)		(240)	(14,032)	(14,032)
Other comprehensive income	3,801	3,801	3,801			3,200		3,200	601
Net income	77,187	77,187	77,165	22	229	67,131	14,032	53,099	10,034
Balance at Dec. 31, 2016		1,262,811	1,261,707	1,104	10,660	1,093,443	202,576	890,867	168,264
Increase (Decrease) in Partners' Capital [Roll Forward]
Exercise of stock options	13	13	13			13		13
Redemption of limited partner units	(251)	(251)	(251)						(251)
Exchange of limited partner units						2,463		2,463	(2,463)
Other		(146)	(146)		0	(146)		(146)
Equity-based compensation		6,402	6,402			5,280		5,280	1,122
Adjustments to noncontrolling interests						(330)		(330)	330
Purchase of redeemable noncontrolling interest	565	565	565		(7,395)	565		565
Distributions to common unitholders, net		(221,994)	(221,880)	(114)		(186,919)		(186,919)	(34,961)
Distributions declared on preferred units		(14,032)	(14,032)		(240)	(14,032)	(14,032)
Other comprehensive income	2,401	2,401	2,401			2,004		2,004	397
Net income	231,353	231,353	231,285	68	240	197,063	14,032	183,031	34,222
Balance at Dec. 31, 2017		1,267,122	1,266,064	1,058	3,265	1,099,404	202,576	896,828	166,660
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption of limited partner units	(28)	(28)	(28)						(28)
Other		(103)	(103)			(103)		(103)	0
Equity-based compensation		8,322	8,322			7,480		7,480	842
Adjustments to noncontrolling interests	0	0	0			168		168	(168)
Distributions to common unitholders, net		(222,615)	(222,549)	(66)	0	(187,792)		(187,792)	(34,757)
Distributions declared on preferred units		(14,032)	(14,032)			(14,032)	(14,032)
Other comprehensive income	(1,284)	(1,284)	(1,284)			(1,104)		(1,104)	(180)
Net income	$ 108,415	108,415	108,339	76	240	93,604	14,032	79,572	14,735
Balance at Dec. 31, 2018		$ 1,148,271	$ 1,147,203	$ 1,068	$ 3,265	$ 999,710	$ 202,576	$ 797,134	$ 147,493

Organization

Organization	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Washington Prime Group Inc. ("WPG Inc.") is an Indiana corporation that operates as a fully integrated, self-administered and self-managed real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended (the "Code"). WPG Inc. will generally qualify as a REIT for U.S. federal income tax purposes as long as it continues to distribute at least 90% of its REIT taxable income, exclusive of net capital gains, and satisfy certain other requirements. WPG Inc. will generally be allowed a deduction against its U.S. federal income tax liability for dividends paid by it to REIT shareholders, thereby reducing or eliminating any corporate level taxation to WPG Inc. Washington Prime Group, L.P. ("WPG L.P.") is WPG Inc.'s majority-owned limited partnership subsidiary that owns, develops and manages, through its affiliates, all of WPG Inc.'s real estate properties and other assets. WPG Inc. is the sole general partner of WPG L.P. On May 28, 2014, WPG separated from Simon Property Group ("SPG") through the distribution of 100% of the outstanding units of WPG L.P. to the owners of Simon Property Group L.P. and 100% of the outstanding shares of WPG Inc. to the SPG common shareholders in a tax-free distribution. Prior to the separation, WPG Inc. and WPG L.P. were wholly owned subsidiaries of SPG and its subsidiaries. On January 15, 2015, the Company acquired Glimcher Realty Trust ("GRT") in a stock and cash transaction valued at approximately $4.2 billion , including the assumption of debt. As of December 31, 2018 , our assets consisted of material interests in 108 shopping centers in the United States, consisting of open air properties and enclosed retail properties, comprised of approximately 58 million square feet (unaudited) of managed gross leasable area ("GLA"). Unless the context otherwise requires, references to "WPG," the "Company," "we," "us" or "our" refer to WPG Inc., WPG L.P. and entities in which WPG Inc. or WPG L.P. (or any affiliate) has a material ownership or financial interest, on a consolidated basis. We derive our revenues primarily from retail tenant leases, including fixed minimum rent leases, overage and percentage rent leases based on tenants' sales volumes, offering property operating services to our tenants and others, including energy, waste handling and facility services, and reimbursements from tenants for certain recoverable expenditures such as property operating, real estate taxes, repair and maintenance, and advertising and promotional expenses. We seek to enhance the performance of our properties and increase our revenues by, among other things, securing leases of anchor and inline tenant spaces, re-developing or renovating existing properties to increase the leasable square footage, and increasing the productivity of occupied locations through aesthetic upgrades, re-merchandising and/or changes to the retail use of the space. Leadership Changes and Severance Impacting Financial Results 2018 Activity On May 7, 2018, the Company's Executive Vice President, Property Management was terminated without cause from his position and received severance payments and other benefits pursuant to the terms and conditions of his employment agreement. In addition, the Company terminated without cause additional non-executive personnel in the Property Management department. In connection with and as part of the aforementioned management and personnel changes, the Company recorded aggregate severance charges of $2.0 million , including $0.5 million of non-cash stock compensation in the form of accelerated vesting of equity incentive awards, which costs are included in general and administrative expense in the accompanying consolidated statements of operations and comprehensive income for the year ended December 31, 2018. 2016 Activity On June 20, 2016, the Company announced the following leadership changes: (1) the resignation of Mr. Michael P. Glimcher as the Company’s Chief Executive Officer and Vice Chairman of the Board; (2) the appointment of Mr. Louis G. Conforti, a current Board member, as Interim Chief Executive Officer; (3) the resignation of Mr. Mark S. Ordan as non-executive Chairman of the Board; and (4) the resignation of Mr. Niles C. Overly from the Board. In July of 2016, the Company terminated some additional executive and non-executive personnel as part of an effort to reduce overhead costs. On October 6, 2016, the Company announced that Mr. Conforti would serve as the Company's Chief Executive Officer for a term ending December 31, 2019, subject to early termination clauses and automatic renewals pursuant to his employment agreement. In connection with and as part of the aforementioned management changes, the Company recorded a charge of $29.6 million during the year ended December 31, 2016, of which $25.5 million related to severance and restructuring-related costs, including $9.5 million of non-cash stock compensation for accelerated vesting of equity incentive awards, and $4.1 million related to fees and expenses incurred in connection with the Company's investigation of various strategic alternatives, which costs are included in merger, restructuring and transaction costs in the accompanying consolidated statements of operations and comprehensive income.

Basis of Presentation and Princ

Basis of Presentation and Principles of Consolidation and Combination	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The consolidated balance sheets as of December 31, 2018 and 2017 include the accounts of WPG Inc. and WPG L.P., as well as their majority owned and controlled subsidiaries. The accompanying consolidated statements of operations include the consolidated accounts of the Company. All intercompany transactions have been eliminated in consolidation. General These consolidated financial statements reflect the consolidation of properties that are wholly owned or properties in which we own less than a 100% interest but that we control. Control of a property is demonstrated by, among other factors, our ability to refinance debt and sell the property without the consent of any other unaffiliated partner or owner, and the inability of any other unaffiliated partner or owner to replace us. We consolidate a variable interest entity ("VIE") when we are determined to be the primary beneficiary. Determination of the primary beneficiary of a VIE is based on whether an entity has (1) the power to direct activities that most significantly impact the economic performance of the VIE and (2) the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. Our determination of the primary beneficiary of a VIE considers all relationships between us and the VIE, including management agreements and other contractual arrangements. As of December 31, 2018 , we have two VIEs which consist of our interest in WPG L.P. and undeveloped land, respectively. There have been no changes during the year ended December 31, 2018 to any of our previous conclusions about whether an entity qualifies as a VIE or whether we are the primary beneficiary of any previously identified VIE. During the year ended December 31, 2018 , we did not provide financial or other support to a previously identified VIE that we were not previously contractually obligated to provide. Investments in partnerships and joint ventures represent our noncontrolling ownership interests in properties. We account for these investments using the equity method of accounting. We initially record these investments at cost and we subsequently adjust for net equity in income or loss, which we allocate in accordance with the provisions of the applicable partnership or joint venture agreement and cash contributions and distributions, if applicable. The allocation provisions in the partnership or joint venture agreements are not always consistent with the legal ownership interests held by each general or limited partner or joint venture investee primarily due to partner preferences. We separately report investments in joint ventures for which accumulated distributions have exceeded investments in and our share of net income from the joint ventures within cash distributions and losses in unconsolidated entities, at equity in the consolidated balance sheets. The net equity of certain joint ventures is less than zero because of financing or operating distributions that are usually greater than net income, as net income includes non-cash charges for depreciation and amortization, and WPG has historically committed to or intends to fund the venture. As of December 31, 2018 , our assets consisted of material interests in 108 shopping centers. The consolidated financial statements as of that date reflect the consolidation of 91 wholly owned properties and four additional properties that are less than wholly owned, but which we control or for which we are the primary beneficiary. We account for our interests in the remaining 13 properties, or the joint venture properties, using the equity method of accounting. While we manage the day-to-day operations of the joint venture properties, we do not control the operations as we have determined that our partner or partners have substantive participating rights with respect to the assets and operations of these joint venture properties. We allocate net operating results of WPG L.P. to third parties and to WPG Inc. based on the partners' respective weighted average ownership interests in WPG L.P. Net operating results of WPG L.P. attributable to third parties are reflected in net income attributable to noncontrolling interests. WPG Inc.'s weighted average ownership interest in WPG L.P. was 84.4% , 84.3% and 84.1% for the years ended December 31, 2018, 2017 and 2016 , respectively. As of December 31, 2018 and 2017 , WPG Inc.'s ownership interest in WPG L.P. was 84.4% and, 84.3% respectively. We adjust the noncontrolling limited partners' interests at the end of each period to reflect their interest in WPG L.P.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Cash and Cash Equivalents We consider all highly liquid investments purchased with an original maturity of 90 days or less to be cash and cash equivalents. Cash equivalents are carried at cost, which approximates fair value. Cash equivalents generally consist of commercial paper, bankers' acceptances, repurchase agreements, and money market deposits or securities. Financial instruments that potentially subject us to concentrations of credit risk include our cash and cash equivalents and our tenant receivables. We place our cash and cash equivalents with institutions with high credit quality. However, at certain times, such cash and cash equivalents may be in excess of FDIC and SIPC insurance limits. Investment Properties We record investment properties at fair value when acquired. Investment properties include costs of acquisitions; development, predevelopment, and construction (including allocable salaries and related benefits); tenant allowances and improvements; and interest and real estate taxes incurred during construction. We capitalize improvements and replacements from repair and maintenance when the repair and maintenance extends the useful life, increases capacity, or improves the efficiency of the asset. All other repair and maintenance items are expensed as incurred. We capitalize interest on projects during periods of construction until the projects are ready for their intended purpose based on interest rates in place during the construction period. Capitalized interest for the years ended December 31, 2018, 2017 and 2016 was $2,234 , $1,521 and $2,640 , respectively. We record depreciation on buildings and improvements utilizing the straight-line method over an estimated original useful life, which is generally five to 40 years. We review depreciable lives of investment properties periodically and we make adjustments when necessary to reflect a shorter economic life. We amortize tenant allowances and tenant improvements utilizing the straight-line method over the term of the related lease or occupancy term of the tenant, if shorter. We record depreciation on equipment and fixtures utilizing the straight-line method over three to ten years. We review investment properties for impairment on a property-by-property basis whenever events or changes in circumstances indicate that the carrying value of investment properties may not be recoverable. These circumstances include, but are not limited to, declines in a property's cash flows, ending occupancy, estimated market values or our decision to dispose of a property before the end of its estimated useful life. Furthermore, this evaluation is conducted no less frequently than quarterly, irrespective of changes in circumstances. We measure any impairment of investment property when the estimated undiscounted operating income before depreciation and amortization plus its residual value is less than the carrying value of the property. To the extent impairment has occurred, we charge to expense the excess of carrying value of the property over its estimated fair value. We estimate fair value using unobservable data such as operating income, estimated capitalization rates, leasing prospects and local market information. We may decide to dispose properties that are held for use and the consideration received from these property dispositions may differ from their carrying values. We also review our investments, including investments in unconsolidated entities, if events or circumstances change indicating that the carrying amount of our investments may not be recoverable. We will record an impairment charge if we determine that a decline in the fair value of the investments in unconsolidated entities is other-than-temporary. Changes in economic and operating conditions that occur subsequent to our review of recoverability of investment property and other investments in unconsolidated entities could impact the assumptions used in that assessment and could result in future charges to earnings if assumptions regarding those investments differ from actual results. See the "Impairment" section within Note 4 - "Investment in Real Estate" for a discussion of recent impairments. Investments in Unconsolidated Entities Joint ventures are common in the real estate industry. We use joint ventures to finance properties, develop new properties, and diversify our risk in a particular property or portfolio of properties. We held material unconsolidated joint venture ownership interests in 13 properties as of December 31, 2018 and 2017 (see Note 5 - "Investment in Unconsolidated Entities, at Equity"). Certain of our joint venture properties are subject to various rights of first refusal, buy-sell provisions, put and call rights, or other sale or marketing rights for partners which are customary in real estate joint venture agreements and the industry. We and our partners in these joint ventures may initiate these provisions (subject to any applicable lock up or similar restrictions), which may result in either the sale of our interest or the use of available cash or borrowings to acquire the joint venture interest from our partner. Fair Value Measurements The Company measures and discloses its fair value measurements in accordance with Accounting Standards Codification ("ASC") Topic 820 - “Fair Value Measurement” (“Topic 820”). Topic 820 guidance emphasizes that fair value is a market-based measurement, not an entity-specific measurement. Therefore, a fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, Topic 820 establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The fair value hierarchy, as defined by Topic 820, contains three levels of inputs that may be used to measure fair value as follows: • Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. • Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly such as interest rates, foreign exchange rates, and yield curves, that are observable at commonly quoted intervals. • Level 3 inputs are unobservable inputs for the asset or liability which are typically based on an entity's own assumptions, as there is little, if any, related market activity. 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. Note 6 - "Indebtedness" includes a discussion of the fair value of debt measured using Level 1 and Level 2 inputs. Note 4 - "Investment in Real Estate" includes a discussion of the fair value inputs used in our impairment analyses, using Level 3 inputs, primarily. Level 3 inputs include our estimations of net operating results of the property, capitalization rates and discount rates. The Company has derivatives that must be measured under the fair value standard (see Note 7 - "Derivative Financial Instruments"). The Company currently does not have any non-financial assets and non-financial liabilities that are required to be measured at fair value on a recurring basis. Purchase Accounting Valuation We record the total consideration of acquisitions, including transaction costs as permitted under Accounting Standards Update ("ASU ") 2017-1, "Business Combinations (Topic 805): Clarifying the Definition of a Business," and any excess investment in unconsolidated entities to the various components of the acquisition based upon the fair value of each component which may be derived from various Level 2 and Level 3 inputs. Level 3 inputs include our estimations of net operating results of the property, capitalization rates and discount rates. Also, we may utilize third party valuation specialists. These components typically include buildings, land and intangibles related to in-place leases and we estimate: • the fair value of land and related improvements and buildings on an as-if-vacant basis; • the market value of in-place leases based upon our best estimate of current market rents and amortize the resulting market rent adjustment into revenues; • the value of costs to obtain tenants, including tenant allowances and improvements and leasing commissions; and • the value of revenue and recovery of costs foregone during a reasonable lease-up period, as if the space was vacant. The fair value of buildings is depreciated over the estimated remaining life of the acquired buildings or related improvements. We amortize tenant improvements, in-place lease assets and other lease-related intangibles over the remaining life of the underlying leases. We also estimate the value of other acquired intangible assets, if any, which are amortized over the remaining life of the underlying related intangibles. Use of Estimates We prepared the accompanying consolidated financial statements in accordance with GAAP. This requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and revenues and expenses during the reported period. Our actual results could differ from these estimates. Segment Disclosure Our primary business is the ownership, development and management of retail real estate. We have aggregated our operations, including enclosed retail properties and open air properties, into one reportable segment because they have similar economic characteristics and we provide similar products and services to similar types of, and in many cases, the same tenants. New Accounting Pronouncements Adoption of New Standards On January 1, 2018, we adopted Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers (Topic 606)" using the modified retrospective approach. ASU 2014-09 revised GAAP by offering a single comprehensive revenue recognition standard instead of numerous revenue requirements for particular industries or transactions, which sometimes resulted in different accounting for economically similar transactions. The impacted revenue streams primarily consist of fees earned from management, development and leasing services provided to joint ventures in which we own an interest and other ancillary income earned from our properties. Upon adoption, we recorded a cumulative-effect adjustment to increase equity of approximately $2.5 million related to changes in the revenue recognition pattern of lease commissions earned by the Company from our joint ventures. We do not expect the adoption of ASU 2014-09 to have a material impact to our net income on an ongoing basis. Additionally, we adopted the clarified scope guidance of ASC 610-20, "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" in conjunction with ASU 2014-09, using the modified retrospective approach. ASC 610-20 applies to the sale, transfer and derecognition of nonfinancial assets and in substance nonfinancial assets to noncustomers, including partial sales, and eliminates the guidance specific to real estate in ASC 360-20. With respect to full disposals, the recognition will generally be consistent with our current measurement and pattern of recognition. With respect to partial sales of real estate to joint ventures, the new guidance requires us to recognize a full gain where an equity investment is retained. These transactions could result in a basis difference as we will be required to measure our retained equity interest at fair value, whereas the joint venture may continue to measure the assets received at carryover basis. No adjustments were required upon adoption of this standard. On January 1, 2018, we adopted ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." ASU 2017-12 aims to reduce complexity in cash value hedges of interest rate risk and eliminates the requirement to separately measure and report hedge ineffectiveness, generally requiring the entire change in the fair value of the hedging instrument to be presented in the same income statement line as the hedged item. Upon adoption, we recorded a cumulative-effect adjustment of $0.6 million between accumulated other comprehensive income and retained earnings. The cumulative effect of the changes to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09 and ASU 2017-12 were as follows: Balance at December 31, 2017 Adjustments Due to Adjustments Due to Balance at January 1, 2018 Balance Sheet Liabilities Accounts payable, accrued expenses, intangibles, and deferred revenues $ 264,998 $ (2,474 ) $ — $ 262,524 Equity Capital in excess of par value $ 1,240,483 $ (389 ) $ — $ 1,240,094 Accumulated deficit $ (350,594 ) $ 2,474 $ (584 ) $ (348,704 ) Accumulated other comprehensive income $ 6,920 $ — $ 584 $ 7,504 Noncontrolling interests $ 167,718 $ 389 $ — $ 168,107 In accordance with ASU 2014-09 requirements, the disclosure of the impact of adoption on our consolidated statements of operations for the year ended December 31, 2018 and consolidated balance sheet as of December 31, 2018 were as follows: For the Year Ended December 31, 2018 As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Higher/(Lower) Consolidated Statements of Operations Revenues Other income $ 30,504 $ 29,954 $ 550 December 31, 2018 As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Higher/(Lower) Balance Sheet Liabilities Accounts payable, accrued expenses, intangibles, and deferred revenues $ 253,862 $ 256,886 $ (3,024 ) Equity Capital in excess of par value $ 1,247,639 $ 1,248,111 $ (472 ) Accumulated deficit $ (456,924 ) $ (459,948 ) $ 3,024 Noncontrolling interests $ 148,561 $ 148,089 $ 472 On January 1, 2018, we adopted ASU 2016-15, "Statement of Cash Flows (Topic 230)" and ASU 2016-18 "Restricted Cash" using a retrospective transition approach, which changed our statements of cash flows and related disclosures for all periods presented. ASU 2016-15 is intended to reduce diversity in practice with respect to how certain transactions are classified in the statement of cash flows and its adoption had no impact on our financial statements. ASU 2016-18 requires that a statement of cash flows explain the change during the period in total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. The following is a summary of our cash, cash equivalents and restricted cash total as presented in our statements of cash flows for the years ended December 31, 2018, 2017 and 2016 : For the Year Ended December 31, 2018 2017 2016 Cash and cash equivalents $ 42,542 $ 52,019 $ 59,353 Restricted cash 18,542 18,182 29,160 Total cash, cash equivalents and restricted cash $ 61,084 $ 70,201 $ 88,513 For the year ended December 31, 2017, restricted cash related to cash flows provided by operating activities of $2.9 million , restricted cash related to cash flows used in investing activities of $6.4 million , and restricted cash related to cash flows used in financing activities of $1.7 million were reclassified. For the year ended December 31, 2016, restricted cash related to cash flows provided by operating activities of $0.8 million , restricted cash related to cash flows used in investing activities of $1.5 million , and restricted cash related to cash flows used in financing activities of $10.4 million were reclassified. Restricted cash primarily relates to cash held in escrow for payment of real estate taxes and property reserves for maintenance, expansion or leasehold improvements as required by our mortgage loans. Restricted cash is included in "Deferred costs and other assets" in the accompanying balance sheets as of December 31, 2018 and December 31, 2017. New Standards Issued But Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. It is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The new leases standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. In July 2018, the FASB approved an amendment that provides an entity the optional transition method to initially account for the impact of the adoption ASU 2016-02 with a cumulative adjustment to retained earnings on January 1, 2019 (the effective date of the ASU), rather than January 1, 2017, which would eliminate the need to restate amounts presented prior to January 1, 2019. We will utilize this optional transition method. From a lessee perspective, the Company currently has four material ground leases, two material office leases, and one material garage lease that, under the new guidance, will result in the recognition of a lease liability and corresponding right-of-use asset. As of December 31, 2018 , undiscounted future minimum lease payments due under these leases total approximately $31.1 million with termination dates which range from 2023 to 2076 and we expect the recognized lease liability and corresponding right-of-use asset to not exceed $20.0 million upon adoption. From a lessor perspective, the new guidance remains mostly similar to current rules, though contract consideration will now be allocated between lease and non-lease components. Non-lease component allocations will be recognized under ASU 2014-09, and we expect that this will result in a different pattern of recognition for certain non-lease components, including for fixed common-area ("CAM") revenues. However, the FASB's amendment to ASU 2016-02 referred to above allows lessors to elect, as a practical expedient, not to allocate the total consideration to lease and non-lease components based on their relative standalone selling prices. This practical expedient allows lessors to elect a combined single lease component presentation if (i) the timing and pattern of the revenue recognition of the combined single lease component is the same, and (ii) the combined single component would be classified as an operating lease. We believe we meet the criteria to use this practical expedient and we plan to elect this practical expedient upon the effective date. In addition, ASU 2016-02 limits the capitalization of leasing costs to initial direct costs, which will likely result in a reduction to our capitalized leasing costs and an increase to general and administrative expenses, though the amount of such changes is highly dependent upon the leasing compensation structures in place at the time of adoption. For the years ended December 31, 2018 and 2017 , the Company deferred $17.7 million and $16.9 million of internal leasing costs, respectively. From a lessor perspective, other than the reduction to capitalized leasing costs and increase to general and administrative expenses related to internal leasing costs based on the Company’s current leasing compensation structure, which is not expected to change significantly upon adoption of ASU 2016-02, we do not expect the adoption of ASU 2016-02 to have a material impact to the Company’s consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurements (ASC 820): Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurements." ASU 2018-13 eliminates certain disclosure requirements for all entities, requires public entities to disclose certain new information, and modifies some disclosure requirements. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. We are currently evaluating the impact this ASU will have on our financial statements and related disclosures. Deferred Costs and Other Assets Deferred costs and other assets include the following as of December 31, 2018 and 2017 : 2018 2017 Deferred leasing costs and corporate improvements, net $ 74,260 $ 79,079 In-place lease intangibles, net 38,453 46,627 Acquired above market lease intangibles, net 18,827 24,254 Mortgage and other escrow deposits 18,542 18,182 Prepaids, notes receivable and other assets, net 19,053 20,953 $ 169,135 $ 189,095 During the year ended December 31, 2018, the Company received the remaining $5.3 million outstanding on the promissory note receivable related to the August 19, 2016 sale of Knoxville Center, located in Knoxville, Tennessee (see Note 4 - "Investment in Real Estate" for details). Deferred Leasing Costs and Corporate Improvements Our deferred leasing costs consist of salaries and related benefits, including fees charged by SPG in conjunction with the 2014 spin-off (see Note 11- "Related Party Transactions" for further details), for salaries and related benefits incurred in connection with lease originations, and fees paid to third party brokers. We record amortization of deferred leasing costs on a straight-line basis over the terms of the related leases. Details of deferred leasing costs and corporate improvements as of December 31, 2018 and 2017 are as follows: 2018 2017 Deferred leasing costs $ 142,903 $ 143,667 Corporate improvements 6,072 5,324 Accumulated amortization (74,715 ) (69,912 ) Deferred lease costs and corporate improvements, net $ 74,260 $ 79,079 Amortization of deferred leasing costs is a component of depreciation and amortization expense. The accompanying consolidated statements of operations include amortization expense of $27.9 million , $25.9 million , and $26.0 million for the years ended December 31, 2018, 2017 and 2016 , respectively. Revenue Recognition The following tables disaggregate our revenue by major source for the years ended December 31, 2018, 2017 and 2016 : For the Year Ended December 31, 2018 Minimum rent Overage rent Tenant reimbursements Other income Total Lease related $ 492,169 $ 9,313 $ 191,319 $ 3,457 $ 696,258 Ancillary — — — 10,275 10,275 Fee related — — — 9,527 9,527 Other (1) — — — 7,245 7,245 Total revenues $ 492,169 $ 9,313 $ 191,319 $ 30,504 $ 723,305 (1) Primarily relates to insurance proceeds received from property insurance claims and excess franchise tax refunds for a previously-owned property. For the Year Ended December 31, 2017 Minimum rent Overage rent Tenant reimbursements Other income Total Lease related $ 516,386 $ 9,115 $ 208,290 $ 3,492 $ 737,283 Ancillary — — — 9,848 9,848 Fee related — — — 7,906 7,906 Other — — — 3,085 3,085 Total revenues $ 516,386 $ 9,115 $ 208,290 $ 24,331 $ 758,122 For the Year Ended December 31, 2016 Minimum rent Overage rent Tenant reimbursements Other income Total Lease related $ 572,781 $ 12,882 $ 236,510 $ 1,310 $ 823,483 Ancillary — — — 10,111 10,111 Fee related — — — 6,709 6,709 Other — — — 3,172 3,172 Total revenues $ 572,781 $ 12,882 $ 236,510 $ 21,302 $ 843,475 Minimum Rent Minimum rent is recognized on a straight-line basis over the terms of their respective leases. Minimum rent also includes accretion related to above-market and below-market lease intangibles related to the acquisition of operating properties. We amortize any tenant inducements as a reduction of revenue utilizing the straight-line method over the term of the related lease or occupancy term of the tenant, if shorter. Overage Rent A large number of our retail tenants are also required to pay overage rents based on sales over a stated base amount during the lease year. We recognize overage rents only when each tenant's sales exceed the applicable sales threshold as defined in their lease. Tenant Reimbursements A substantial portion of our leases require the tenant to reimburse us for a material portion of our property operating expenses, including CAM, real estate taxes and insurance. Such property operating expenses typically include utility, insurance, security, janitorial, landscaping, food court and other administrative expenses. Tenant reimbursements are established in the leases or computed based upon a formula related to real estate taxes, insurance and other property operating expenses and are recognized as revenues in the period they are earned. When not reimbursed by the fixed CAM component, CAM expense reimbursements are based on the tenant's proportionate share of the allocable operating expenses and CAM capital expenditures for the property. We accrue reimbursements from tenants for recoverable portions of all these expenses as revenue in the period the applicable expenditures are incurred. We recognize differences between estimated recoveries and the final billed amounts in the subsequent year. Other Income Lease related: We collect lease termination income from tenants to allow for the tenant to vacate their space prior to their scheduled lease termination date. We recognize lease termination income in the period when a termination agreement is signed, collectability is assured, and we are no longer obligated to provide space to the tenant. In the event that a tenant is in bankruptcy when the termination agreement is signed, termination fee income is deferred and recognized when, and if, it is received. Ancillary: We seek to monetize our common areas through robust ancillary programs. These programs include destination holiday experiences, customer service programs, sponsored children's play areas and local events, and static and digital media initiatives. We enter into agreements with unrelated third parties under these programs and charge a negotiated fee in exchange for providing the unrelated third party access to the common area as defined under the respective agreements. We recognize the fee as revenue as we satisfy our performance obligations, which typically occurs over one year. Fee related: We collect fee income primarily from our unconsolidated joint ventures in exchange for providing management, leasing, and development services. Management fees are charged as a percentage of revenues (as defined in the applicable management agreements) and are recognized as revenue as we render such services. Leasing fees are charged on a fixed amount per square foot signed or a percentage of net rent negotiated within the underlying lease and are recognized upon lease execution. Development fees are charged on a contractual percentage of hard costs to develop the respective asset and are recognized as we satisfy our obligation to provide the development services. Allowance for Credit Losses We record a provision for credit losses based on our judgment of a tenant's creditworthiness, ability to pay and probability of collection. In addition, we also consider the retail sector in which the tenant operates and our historical collection experience in cases of bankruptcy, if applicable. Accounts are written off when they are deemed to be no longer collectible. The activity in the allowance for credit losses, which are included in "Tenant receivables and accrued revenue, net" in the accompanying balance sheets, during the years ended December 31, 2018, 2017 and 2016 is as follows: For the Year Ended December 31, 2018 2017 2016 Balance, beginning of year $ 7,867 $ 8,578 $ 4,222 Provision for credit losses 5,826 5,068 4,508 Accounts deconsolidated upon joint venture formation (see Note 5) — (1,271 ) — Accounts written off, net of recoveries, and other (3,562 ) (4,508 ) (152 ) Balance, end of year $ 10,131 $ 7,867 $ 8,578 Income and Other Taxes WPG Inc. has elected to be taxed as a REIT under Sections 856 through 860 of the Code and applicable Treasury regulations relating to REIT qualification. In order to maintain REIT status, the regulations require the entity to distribute at least 90% of taxable income, exclusive of net capital gains, to its owners and meet certain other asset and income tests as well as other requirements. WPG Inc. intends to continue to adhere to these requirements and maintain its REIT status and that of its REIT subsidiaries. As a REIT, WPG Inc. will generally not be liable for federal corporate income taxes as long as it continues to distribute at least of 100% of its taxable income. Thus, we made no provision for federal income taxes on WPG Inc. in the accompanying consolidated financial statements. If WPG Inc. fails to qualify as a REIT, it will be subject to tax at regular corporate rates for the years in which it failed to qualify. If WPG Inc. loses its REIT status it could not elect to be taxed as a REIT for four years unless its failure to qualify was due to reasonable cause and certain other conditions were satisfied. We have also elected taxable REIT subsidiary ("TRS") status for some of WPG Inc.'s subsidiaries. This enables us to provide services that would otherwise be considered impermissible for REITs and participate in activities that do not qualify as "rents from real property." For the years ended December 31, 2018, 2017 and 2016 , we recorded federal income tax provisions (benefits) of $525 , $(87) , and $227 , respectively, related to the taxable income generated by the TRS entities, which is included in income and other taxes in the accompanying consolidated statements of operations and comprehensive income. For these entities, deferred tax assets and liabilities are established for temporary differences between the financial reporting basis and the tax basis of assets and liabilities at the enacted tax rates to be in effect when the temporary differences reverse. There were no deferred tax assets or liabilities for the years ended December 31, 2018 and 2017 as a result of federal and state net operating loss carryovers. A valuation allowance for deferred tax assets is provided if we believe all or some portion of the deferred tax asset may not be realized. An increase or decrease in the valuation allowance that results from the change in circumstances that causes a change in our judgment about the realizability of the related deferred tax asset is included in income. There were no valuation allowances as of December 31, 2018 and 2017, respectively, as the TRS did not have any net operating loss carryovers. As of December 31, 2018 and 2017 , the TRS had no net deferred tax assets related to net operating loss carryovers. We are also subject to certain other taxes, including state and local taxes and franchise taxes, which are included in income and other taxes in the accompanying consolidated statements of operations and comprehensive income. For federal income tax purposes, the cash distributions paid to WPG Inc.'s common and preferred shareholders may be characterized as ordinary income, return of capital (generally non-taxable) or capital gains. Tax law permits certain characterization of distributions which could result in differences between cash basis and tax basis distribution amounts. The following characterizes distributions paid per common and preferred share on a tax basis for the years ended December 31, 2018, 2017 and 2016 : 2018 2017 2016 $ % $ % $ % Common shares Ordinary income $ 1.0000 100.00 % $ 0.4306 43.06 % $ 0.6128 61.28 % Capital gain — — 0.5694 56.94 % — — Non-dividend distributions — — — — 0.3872 38.72 % $ 1.0000 100.00 % $ 1.0000 100.00 % $ 1.0000 100.00 % Series H Preferred Shares Ordinary income $ 1.8752 100.00 % $ 1.0093 43.06 % $ 1.4064 100.00 % Capital gain — — 1.3347 56.94 % — — $ 1.8752 100.00 % $ 2.3440 100.00 % $ 1.4064 100.00 % Series I Preferred Shares Ordinary income $ 1.7188 100.00 % $ 0.9251 43.06 % $ 1.2891 100.00 % Capital gain — — 1.2234 56.94 % — — $ 1.7188 100.00 % $ 2.1485 100.00 % $ 1.2891 100.00 % Noncontrolling Interests fo

Investment in Real Estate

Investment in Real Estate	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Investment in Real Estate	Investment in Real Estate Summary Investment properties consisted of the following as of December 31, 2018 and 2017 : 2018 2017 Land $ 836,214 $ 807,202 Buildings and improvements 4,980,939 4,908,794 Total land, buildings and improvements 5,817,153 5,715,996 Furniture, fixtures and equipment 97,552 91,764 Investment properties at cost 5,914,705 5,807,760 Less: accumulated depreciation 2,283,764 2,139,620 Investment properties at cost, net $ 3,630,941 $ 3,668,140 ​ ​ ​ Construction in progress included above $ 35,068 $ 46,046 Real Estate Acquisitions and Dispositions We acquire interests in properties to generate both current income and long-term appreciation in value. We acquire interests in individual properties or portfolios of retail real estate companies that meet our investment criteria and dispose of properties which no longer meet our strategic criteria. Unless otherwise noted below, gains and losses on these transactions are included in gain (loss) on sale of interests in properties, net in the accompanying consolidated statements of operations and comprehensive income. No acquisition activity occurred during the years ended December 31, 2017 and 2016. Acquisition activity for the year ended December 31, 2018 and disposition activity for the years ended December 31, 2018, 2017 and 2016 is highlighted as follows: 2018 Acquisitions On April 11, 2018, we acquired, through a sale-leaseback transaction, four Sears department stores and adjacent Sears Auto Centers at Longview Mall, located in Longview, Texas; Polaris Fashion Place®, located in Columbus, Ohio; Southern Hills Mall, located in Sioux City, Iowa; and Town Center at Aurora, located in Aurora, Colorado. The purchase price was approximately $28.5 million and was funded by a combination of $13.4 million from our Facility (as defined in Note 6 - "Indebtedness"), $9.7 million from the first tranche of the Four Corners transaction, as discussed below, and $5.4 million from O'Connor Mall Partners, L.P. ("O'Connor") related to their pro-rata share of the joint venture that owns Polaris Fashion Place® (see Note 5 - "Investment in Unconsolidated Entities, at Equity"). On April 24, 2018, the Company closed on the acquisition of Southgate Mall, located in Missoula, Montana, for $58.0 million , which was funded from our Facility (as defined in Note 6 - "Indebtedness"). The following table summarizes the fair value allocation for the acquisitions, which was finalized during the three months ended June 30, 2018: Investment properties $ 72,647 Investment in and advances to unconsolidated entities, at equity 5,543 Deferred costs and other assets 10,311 Accounts payable, accrued expenses, intangibles, and deferred revenue (8,393 ) Net cash paid for acquisitions $ 80,108 Intangibles of $10.3 million , which relate primarily to above-market leases and lease in place values, are included in “Deferred costs and other assets” as of the respective acquisition dates. The initial weighted average useful life of the intangible assets was 11.5 years. Intangibles of $4.9 million , which relate primarily to below-market leases, are included in “Accounts payable, accrued expense, intangibles, and deferred revenue” as of the respective acquisition dates. The initial weighted average useful life of the intangible liabilities was 9.6 years. The transactions were accounted for as asset acquisitions and accordingly, $0.6 million of transaction costs were capitalized as part of the allocation of fair value. 2018 Dispositions During the year ended December 31, 2018 , we completed the sale of various tranches of restaurant outparcels to FCPT Acquisitions, LLC ("Four Corners") pursuant to the purchase and sale agreement executed on September 20, 2017 between the Company and Four Corners. The following table summarizes the key terms of each tranche: Tranche Sales Date Parcels Sold Purchase Price Sales Proceeds Tranche 1 January 12, 2018 10 $ 13,692 $ 13,506 Tranche 2 June 29, 2018 5 9,503 9,423 Tranche 3 July 27, 2018 2 4,607 4,530 Tranche 4 October 31, 2018 2 1,718 1,714 Tranche 5 November 16, 2018 1 3,195 3,166 20 $ 32,715 $ 32,339 The Company used the proceeds to fund a portion of the acquisition of the Sears parcels on April 11, 2018 as discussed above, to reduce corporate debt, and to fund ongoing redevelopment efforts. The Company expects to close on the remaining 24 outparcels for approximately $37.5 million during the first half of 2019, subject to due diligence and closing conditions (see Note 13 - "Subsequent Events" for additional details). In connection with the 2018 dispositions, the Company recorded a net gain of $24.6 million which is included in gain (loss) on disposition of interests in properties, net in the accompanying consolidated statements of operations and comprehensive income for the year ended December 31, 2018 . On October 23, 2018, Rushmore Mall, located in Rapid City, South Dakota, was transitioned to the lender (see Note 6 - "Indebtedness" for further discussion). 2017 Dispositions On November 3, 2017, we completed the sale of Colonial Park Mall, located in Harrisburg, Pennsylvania, to an unaffiliated private real estate investor for a purchase price of $15.0 million . The net proceeds were used for general corporate purposes. On June 13, 2017, we sold 49% of our interest in Malibu Lumber Yard, located in Malibu, California, as part of the O'Connor Joint Venture II transaction (as defined below and as discussed in in Note 5 - "Investment in Unconsolidated Entities, at Equity"). On June 7, 2017, we completed the sale of Morgantown Commons, located in Morgantown, West Virginia, to an unaffiliated private real estate investor for a purchase price of approximately $6.7 million . The net proceeds were used for general corporate purposes. On May 16, 2017, we completed the sale of an 80,000 square foot (unaudited) vacant anchor parcel at Indian Mound Mall, located in Heath, Ohio, to an unaffiliated private real estate investor for a purchase price of approximately $0.8 million . The net proceeds were used for general corporate purposes. On May 12, 2017, we completed the transaction with regard to the ownership and operation of six of the Company's retail properties and certain related outparcels (the "O'Connor Joint Venture II" as discussed in Note 5 - "Investment in Unconsolidated Entities, at Equity"). On February 21, 2017, we completed the sale of Gulf View Square, located in Port Richey, Florida, and River Oaks Center, located in Chicago, Illinois, to unaffiliated private real estate investors for an aggregate purchase price of $42.0 million . The net proceeds from the transaction were used to reduce corporate debt. On January 10, 2017, we completed the sale of Virginia Center Commons, located in Glen Allen, Virginia, to an unaffiliated private real estate investor for a purchase price of $9.0 million . The net proceeds from the transaction were used to reduce corporate debt. In connection with the 2017 dispositions, the Company recorded a net gain of $124.8 million which is included in gain (loss) on disposition of interests in properties, net in the accompanying consolidated statements of operations and comprehensive income for the year ended December 31, 2017 . On October 3, 2017, Valle Vista Mall, located in Harlingen, Texas, was transitioned to the lender (see Note 6 - "Indebtedness" for further discussion). 2016 Dispositions On November 10, 2016, we completed the sale of Richmond Town Square, located in Cleveland, Ohio, to a private real estate investor for a purchase price of $7.3 million . The net proceeds from the transaction were used to reduce the balance of corporate debt. On August 19, 2016, the Company completed the sale of Knoxville Center to a private real estate investor (the "Buyer") for a purchase price of $10.1 million . The sales price consisted of $3.9 million paid to the Company at closing and the issuance of a promissory note for $6.2 million from the Buyer to the Company with an interest rate of 5.5% per annum (see Note 3 - "Summary of Significant Accounting Policies" for further discussion). The remaining note receivable balance of $5.3 million was received during the year ended December 31, 2018. The net proceeds from the transaction were used to reduce the balance outstanding under the Facility (see Note 6 - "Indebtedness"). On January 29, 2016, we completed the sale of Forest Mall and Northlake Mall to private real estate investors (the "Buyers") for an aggregate purchase price of $30 million . The sales price consisted of $10 million paid to us at closing and the issuance of a promissory note for $20 million from us to the Buyers with an interest rate of 6% per annum. On June 29, 2016, the Buyers repaid $4.4 million of the promissory note balance and exercised a six-month extension option. The remaining proceeds were paid in full on January 4, 2017. The net proceeds from the transaction were used to reduce the balance outstanding under the Facility (see Note 6 - "Indebtedness"). In connection with the 2016 dispositions, the Company recorded a net loss of $2.0 million , which is included in gain (loss) on disposition of interests in properties, net in the accompanying consolidated statements of operations and comprehensive income for the year ended December 31, 2016 . On December 29, 2016, June 9, 2016 and April 28, 2016, River Valley Mall, located in Lancaster, Ohio, Merritt Square Mall, located in Merritt Island, Florida, and Chesapeake Square, located in Chesapeake, Virginia, were transitioned to the lenders, respectively (see Note 6 - "Indebtedness" for further discussion). Intangible Assets and Liabilities Associated with Acquisitions Intangible assets and liabilities, which were recorded at the respective acquisition dates, are associated with the Company's acquisitions of properties at fair value. The gross intangibles recorded as of their respective acquisition date are comprised of an asset for acquired above-market leases in which the Company is the lessor, a liability for acquired below-market leases in which the Company is the lessor, and an asset for in-place leases. The following table denotes the gross carrying values of the respective intangibles as of December 31, 2018 and 2017 : Balance as of Intangible Asset/Liability December 31, 2018 December 31, 2017 Above-market leases - Company is lessor $ 48,373 $ 51,315 Below-market leases - Company is lessor $ 117,395 $ 124,475 In-place leases $ 109,379 $ 120,159 The intangibles related to above and below-market leases in which the Company is the lessor are amortized to minimum rents on a straight-line basis over the estimated life of the lease, with amortization as a net increase to minimum rents in the amounts of $8,971 , $7,323 , and $9,930 for the years ended December 31, 2018, 2017 and 2016 , respectively. In-place leases are amortized to depreciation and amortization expense over the life of the leases to which they pertain, with such amortization of $14,780 , $18,457 , and $24,269 for the years ended December 31, 2018, 2017 and 2016 , respectively. The table below identifies the types of intangible assets and liabilities, their location on the consolidated balance sheets, their weighted average amortization period, and their book value, which is net of accumulated amortization, as of December 31, 2018 and 2017 : Balance as of Intangible Location on the Weighted Average Remaining Amortization (in years) December 31, 2018 December 31, 2017 Above-market leases - Company is lessor Deferred costs and other assets 6.9 $ 18,827 $ 24,254 Below-market leases - Company is lessor Accounts payable, accrued expenses, intangibles and deferred revenues 12.6 $ 66,651 $ 77,870 In-place leases Deferred costs and other assets 11.1 $ 38,453 $ 46,627 The future net amortization of intangibles as an increase (decrease) to net income as of December 31, 2018 is as follows: Above/Below-Market Leases-Lessor In-place Leases Total Net Intangible Amortization 2019 $ 4,339 $ (9,203 ) $ (4,864 ) 2020 4,606 (6,965 ) (2,359 ) 2021 4,677 (3,584 ) 1,093 2022 4,187 (2,819 ) 1,368 2023 3,619 (2,285 ) 1,334 Thereafter 26,396 (13,597 ) 12,799 $ 47,824 $ (38,453 ) $ 9,371 Impairment During the fourth quarter of 2017, a major anchor tenant of Rushmore Mall informed us of their intention to close their store at the property. The impending closure was deemed a triggering event and, therefore, we evaluated this property in conjunction with our quarterly impairment review and preparation of our financial statements for the year ended December 31, 2017. We compared the estimated fair value of $37.5 million to the related carrying value of $75.0 million , which resulted in the recording of an impairment charge of approximately $37.5 million in the consolidated statements of operations and comprehensive income for the year ended December 31, 2017. On November 3, 2017, the Company completed the sale of Colonial Park Mall for $15.0 million . We compared the fair value measurement of the property to its relative carrying value, which resulted in the recording of an impairment charge of approximately $20.9 million in the accompanying consolidated statements of operations and comprehensive income for the year ended December 31, 2017. The impairment charge was due to the change in facts and circumstances when we decided to hold the asset for a shorter period which resulted in the carrying value not being recoverable from the projected cash flows. During the first quarter of 2017, the Company entered into a purchase and sale agreement to dispose of Morgantown Commons, which was sold in the second quarter of 2017. Earlier in 2017, we shortened the hold period used in assessing impairment for the asset, which resulted in the carrying value not being recoverable from the expected cash flows. The purchase offer represented the best available evidence of fair value for this property. We compared the fair value to the carrying value, which resulted in the recording of an impairment charge of approximately $8.5 million in the accompanying consolidated statements of operations and comprehensive income for the year ended December 31, 2017. During the year ended December 31, 2016, we recorded an impairment charge of $21.9 million , primarily related to noncore properties consisting of Gulf View Square, Richmond Town Square, River Oaks Center, and Virginia Center Commons. The impairment charge was attributed to the continued declines in the fair value of the properties and executed agreements entered into in 2016 to sell these properties at prices below the carrying value.

Investment In Unconsolidated En

Investment In Unconsolidated Entities, at Equity	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment in Unconsolidated Entities, at Equity	Investment in Unconsolidated Entities, at Equity The Company's investment activity in unconsolidated real estate entities for the years ended December 31, 2018 and 2017 consisted of investments in the following joint ventures: • The O'Connor Joint Venture I This investment consists of a 51% noncontrolling interest held by the Company in a portfolio of five enclosed retail properties and related outparcels, consisting of the following: The Mall at Johnson City located in Johnson City, Tennessee; Pearlridge Center located in Aiea, Hawaii; Polaris Fashion Place®; Scottsdale Quarter® located in Scottsdale, Arizona; and Town Center Plaza (which consists of Town Center Plaza and the adjacent Town Center Crossing) located in Leawood, Kansas. We retain management, leasing, and development responsibilities for the O'Connor Joint Venture I. On April 11, 2018, the O'Connor Joint Venture I closed on the acquisition of the Sears department store located at Polaris Fashion Place® in connection with our acquisition of additional Sears department stores (see Note 4 - "Investment in Real Estate"). On March 2, 2017, the O'Connor Joint Venture I closed on the purchase of Pearlridge Uptown II, an approximately 153,000 square foot (unaudited) wing of Pearlridge Center, for a gross purchase price of $70.0 million . On March 30, 2017, the O'Connor Joint Venture I closed on a $43.2 million non-recourse mortgage note payable with an eight year term and a fixed interest rate of 4.071% secured by Pearlridge Uptown II. The mortgage note payable requires monthly interest only payments until April 1, 2019, at which time monthly interest and principal payments are due until maturity. On March 29, 2017, the O'Connor Joint Venture I closed on a $55.0 million non-recourse mortgage note payable with a ten year term and a fixed interest rate of 4.36% secured by sections of Scottsdale Quarter® known as Block K and Block M. The mortgage note payable requires monthly interest only payments until May 1, 2022, at which time monthly interest and principal payments are due until maturity. • The O'Connor Joint Venture II During the year ended December 31, 2017, we completed an additional joint venture transaction with O'Connor with respect to the ownership and operation of seven of the Company's retail properties and certain related outparcels, consisting of the following: The Arboretum, located in Austin, Texas; Arbor Hills; the Oklahoma City Properties; Gateway Centers, located in Austin, Texas; Malibu Lumber Yard; Palms Crossing I and II, located in McAllen, Texas; and The Shops at Arbor Walk, located in Austin, Texas (the "O'Connor Joint Venture II"). The transaction valued the properties at $598.6 million before closing adjustments and debt assumptions. Under the terms of the joint venture agreement, we retained a non-controlling 51% interest in the O'Connor Joint Venture II and sold the remaining 49% to O'Connor. The transaction generated net proceeds to the Company of approximately $138.9 million , after taking into consideration costs associated with the transaction and the assumption of debt (including the new mortgage loans on The Arboretum, Gateway Centers, and Oklahoma City Properties which closed prior to the joint venture transaction; see Note 6 - "Indebtedness" for net proceeds to the Company from the new mortgage loans), which we used to reduce the Company's debt as well as for general corporate purposes. At the time of closing, we deconsolidated the properties included in the O'Connor Joint Venture II and recorded a gain in connection with this partial sale of $126.1 million , which is included in gain (loss) on disposition of interests in properties, net in the accompanying consolidated statements of operations and comprehensive income. The gain was recorded pursuant to ASC 360-20 and calculated based upon proceeds received, less 49% of the book value of the deconsolidated net assets. Our retained 51% non-controlling equity method interest was valued at historical cost based upon the pro rata book value of the retained interest in the net assets. We retain management and leasing responsibilities for the properties included in the O'Connor Joint Venture II. In connection with the formation of this joint venture, we recorded transaction costs of approximately $6.4 million as part of our basis in this investment. • The Seminole Joint Venture This investment consists of a 45% non-controlling interest held by the Company in Seminole Towne Center, an approximate 1.1 million square foot (unaudited) enclosed regional retail property located in the Orlando, Florida area. The Company's effective financial interest in this property (after preferences) was approximately 6.76% for the year ended December 31, 2018 . We retain day to day management, leasing, and development responsibilities for the Seminole Joint Venture. During the year ended December 31, 2017, the Company received cash of $0.7 million (after preferences) related to our share of the proceeds from the sale of two outparcels, which was recorded in income (loss) from unconsolidated entities, net in the accompanying consolidated statements of operations and comprehensive income. • Other Joint Venture The Company also holds an indirect 12.5% ownership interest in certain real estate through a joint venture with an unaffiliated third party. We do not have management, leasing and development responsibilities for this joint venture. Advances to the O'Connor Joint Venture I and O'Connor Joint Venture II totaled $5.2 million and $4.3 million as of December 31, 2018 and 2017 , respectively, which are included in investment in and advances to unconsolidated entities, at equity in the accompanying consolidated balance sheets. Management deems this balance to be collectible and anticipates repayment within one year. The results for the O'Connor Joint Venture I, Seminole Joint Venture, and our indirect 12.5% ownership interest are included below for all periods presented. The results for the O'Connor Joint Venture II are included below for the year ended December 31, 2018 and from May 12, 2017 (the closing date of the venture), and in the case of Malibu Lumber Yard from June 13, 2017 (the date the property was contributed to the venture), through December 31, 2017. For the Year Ended December 31, 2018 2017 2016 Total revenues $ 264,521 $ 236,415 $ 191,831 Operating expenses 108,513 95,603 78,685 Depreciation and amortization 97,810 89,397 78,972 Operating income 58,198 51,415 34,174 Gain on sale of interests in property and unconsolidated entities, net 583 1,585 1,014 Interest expense, taxes, and other, net (52,477 ) (45,906 ) (32,754 ) Net income from the Company's unconsolidated real estate entities $ 6,304 $ 7,094 $ 2,434 Our share of income (loss) from the Company's unconsolidated real estate entities $ 541 $ 1,395 $ (1,745 ) The following table presents the combined balance sheets for the unconsolidated joint venture properties for the periods indicated above during which the Company accounted for these investments as unconsolidated entities as of December 31, 2018 and 2017 : December 31, 2018 2017 Assets: Investment properties at cost, net $ 1,964,699 $ 1,972,208 Construction in progress 21,019 44,817 Cash and cash equivalents 43,169 40,955 Tenant receivables and accrued revenue, net 31,661 30,866 Deferred costs and other assets (1) 147,481 174,665 Total assets $ 2,208,029 $ 2,263,511 Liabilities and Members’ Equity: Mortgage notes payable $ 1,292,801 $ 1,302,143 Accounts payable, accrued expenses, intangibles, and deferred revenues (2) 137,073 148,273 Total liabilities 1,429,874 1,450,416 Members’ equity 778,155 813,095 Total liabilities and members’ equity $ 2,208,029 $ 2,263,511 Our share of members’ equity, net $ 396,229 $ 414,245 (1) Includes value of acquired in-place leases and acquired above-market leases with a net book value of $91,609 and $107,869 as of December 31, 2018 and 2017 , respectively. (2) Includes the net book value of below market leases of $57,392 and $69,269 as of December 31, 2018 and 2017 , respectively. The following table presents the investment in and advances to (cash distributions and losses in) unconsolidated entities for the periods indicated above during which the Company accounted for these investments as unconsolidated entities as of December 31, 2018 and 2017 : December 31, 2018 2017 Our share of members’ equity, net $ 396,229 $ 414,245 Advances and excess investment 21,557 22,173 Net investment in and advances to unconsolidated entities, at equity (1) $ 417,786 $ 436,418 (1) Includes $433,207 and $451,839 of investment in and advances to unconsolidated entities, at equity as of December 31, 2018 and 2017 , respectively, and $15,421 and $15,421 of cash distributions and losses in unconsolidated entities, at equity as of December 31, 2018 and 2017 , respectively.

Indebtedness

Indebtedness	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Indebtedness	Indebtedness Mortgage Debt Total mortgage indebtedness at December 31, 2018 and 2017 was as follows: 2018 2017 Face amount of mortgage loans $ 980,276 $ 1,152,436 Fair value adjustments, net 5,764 8,338 Debt issuance cost, net (2,771 ) (3,692 ) Carrying value of mortgage loans $ 983,269 $ 1,157,082 The mortgage debt had weighted average interest and maturity of 5.00% and 3.5 years at December 31, 2018 and 4.77% and 4.0 years at December 31, 2017 . A roll forward of mortgage indebtedness from December 31, 2017 to December 31, 2018 is summarized as follows: Balance at December 31, 2017 $ 1,157,082 Debt amortization payments (18,322 ) Repayment of debt (94,838 ) Debt borrowings, net of issuance costs 34,782 Debt canceled upon lender foreclosures, net of debt issuance costs (93,988 ) Amortization of fair value and other adjustments (2,574 ) Amortization of debt issuance costs 1,127 Balance at December 31, 2018 $ 983,269 2018 Activity On October 23, 2018 , the $94.0 million mortgage on Rushmore Mall was canceled upon a deed-in-lieu of foreclosure agreement (see "Covenants" section below for additional details). On October 2, 2018 , an affiliate of WPG Inc. repaid the $8.3 million mortgage loan on Whitehall Mall, located in Whitehall, Pennsylvania. This repayment was funded by cash on hand. On September 27, 2018 , an affiliate of WPG Inc. closed on a $35.0 million full-recourse mortgage note payable with a three -year term and a fixed rate of 4.48% secured by Southgate Mall. The mortgage note payable requires interest only payments and will initially mature on September 27, 2021 , subject to two one -year extensions available at our option subject to compliance with the terms of the underlying loan agreement and payment of customary extension fees. The proceeds were used to reduce corporate debt and for ongoing redevelopment efforts. On June 8, 2018 , the Company exercised the first of three options to extend the maturity date of the $65.0 million term loan secured by Weberstown Mall, located in Stockton, California, for one year. The extended maturity date is June 8, 2019 , subject to two one year extensions available at our option subject to compliance with the terms of the underlying loan agreement and payment of customary extension fees. On January 19, 2018 , an affiliate of WPG Inc. repaid the $86.5 million mortgage loan on The Outlet Collection ® | Seattle, located in Auburn, Washington. This repayment was funded by borrowings on the Revolver (as defined below). 2017 Activity On December 29, 2017, an affiliate of WPG Inc. repaid the $11.7 million mortgage loan secured by Henderson Square, located in King of Prussia, Pennsylvania. This repayment was funded by cash on hand. On October 17, 2017, an affiliate of WPG Inc. completed a discounted payoff of the $99.7 million mortgage loan secured by Southern Hills Mall, located in Sioux City, Iowa, for $55.0 million (see "Covenants" section below for additional details). On October 3, 2017, the $40.0 million mortgage on Valle Vista Mall was canceled upon a deed-in-lieu of foreclosure agreement (see "Covenants" section below for additional details). On October 2, 2017, an affiliate of WPG Inc. repaid the $99.6 million mortgage loan on WestShore Plaza, located in Tampa, Florida. This repayment was funded by borrowings on the Revolver. On May 10, 2017 and prior to the deconsolidation of these properties due to the sale of 49% of our interests (see Note 5 - "Investment in Unconsolidated Entities, at Equity" for further details), the Company closed on non-recourse mortgage loans encumbering The Arboretum, Gateway Centers, and Oklahoma City Properties. The following table summarizes the key terms of each mortgage loan: Property Principal Debt issuance costs Net debt issuance Interest Rate Maturity Date The Arboretum $ 59,400 $ (452 ) $ 58,948 4.13 % June 1, 2027 Gateway Centers 112,500 (709 ) 111,791 4.03 % June 1, 2027 Oklahoma City Properties 43,279 (427 ) 42,852 3.90 % June 1, 2027 Total $ 215,179 $ (1,588 ) $ 213,591 The Arboretum and Gateway Centers loans require monthly interest only payments until July 1, 2021, at which time monthly interest and principal payments are due until maturity. The Oklahoma City Properties loan requires monthly interest only payments until July 1, 2022, at which time monthly interest and principal payments are due until maturity. We used the net proceeds to repay a portion of the outstanding balance on the Revolver, as defined below. These three loans were deconsolidated during the year ended December 31, 2017, in connection with the completion of the O'Connor Joint Venture II transaction. On April 25, 2017, the Company completed a discounted payoff of the $87.3 million mortgage loan secured by Mesa Mall, located in Grand Junction, Colorado, for $63.0 million (see "Covenants" section below for additional details). Unsecured Debt On January 22, 2018 , WPG L.P. amended and restated $1.0 billion of the existing facility. The recast Facility (as defined below) can be increased to $1.5 billion through currently uncommitted Facility commitments. Excluding the accordion feature, the recast Facility includes a $650.0 million Revolver (as defined below) and $350.0 million Term Loan (as defined below). The $350.0 million Term Loan was fully funded at closing, and the Company used the proceeds to repay the $270.0 million outstanding on the June 2015 Term Loan (as defined below) and to pay down the Revolver. On August 4, 2017, WPG L.P. completed the issuance of $750.0 million of unsecured notes. The proceeds were used to repay the $500.0 million previously outstanding Term Loan (as defined below) and partial repayment of $230.0 million on the June 2015 Term Loan (as defined below). The following table identifies our total unsecured debt outstanding at December 31, 2018 and December 31, 2017 : December 31, December 31, Notes payable: Face amount - 3.850% Notes due 2020 (the "Exchange Notes") (1) $ 250,000 $ 250,000 Face amount - 5.950% Notes due 2024 (2) 750,000 750,000 Debt discount, net (9,680 ) (11,086 ) Debt issuance costs, net (7,623 ) (9,542 ) Total carrying value of notes payable $ 982,697 $ 979,372 Unsecured term loans: (8) Face amount - Term Loan (3)(4) $ 350,000 $ — Face amount - December 2015 Term Loan (5) 340,000 340,000 Face amount - June 2015 Term Loan (6) — 270,000 Debt issuance costs, net (4,491 ) (3,305 ) Total carrying value of unsecured term loans $ 685,509 $ 606,695 Revolving credit facility: (3)(7) Face amount $ 290,000 $ 155,000 Debt issuance costs, net (3,998 ) (540 ) Total carrying value of revolving credit facility $ 286,002 $ 154,460 (1) The Exchange Notes were issued at a 0.028% discount, bear interest at 3.850% per annum and mature on April 1, 2020. (2) The 5.950% Notes due 2024 were issued at a 1.533% discount, bear interest at 5.950% per annum, and mature on August 15, 2024. The interest rate could vary in the future based upon changes to the Company's credit ratings (see Note 13 - "Subsequent Events"). (3) The unsecured revolving credit facility, or "Revolver" and unsecured term loan, or "Term Loan" are collectively known as the "Facility." (4) The Term Loan bears interest at one-month LIBOR plus 1.45% per annum and will mature on December 30, 2022. We had interest rate swap agreements totaling $270.0 million , which effectively fixed the interest rate on a portion of the Term Loan at 2.56% per annum through June 30, 2018. On May 9, 2018, we executed swap agreements totaling $250.0 million to replace matured swap agreements, which effectively fix the interest rate on a portion of the Term Loan at 4.21% through June 30, 2021. At December 31, 2018 , the applicable interest rate on the unhedged portion of the Term Loan was one-month LIBOR plus 1.45% or 3.95% . (5) The December 2015 Term Loan bears interest at one-month LIBOR plus 1.80% per annum and will mature on January 10, 2023. We have interest rate swap agreements totaling $340.0 million , which effectively fix the interest rate at 3.51% per annum through maturity. (6) The June 2015 Term Loan bore interest at one-month LIBOR plus 1.45% per annum. During the year ended December 31, 2017, the Company repaid $230.0 million of the June 2015 Term Loan and wrote off $0.9 million of debt issuance costs. On January 22, 2018, the Company repaid the remaining $270.0 million outstanding with proceeds from the amended and restated Facility (as discussed above) and wrote off $0.5 million of debt issuance costs. (7) As of December 31, 2017, the Revolver provided borrowings on a revolving basis up to $900.0 million , bore interest at one-month LIBOR plus 1.25% , and was initially scheduled to mature on May 30, 2018. On January 22, 2018, we amended the terms of the Revolver to provide borrowings on a revolving basis up to $650.0 million at one-month LIBOR plus 1.25% . Under the amended terms, the Revolver will mature on December 30, 2021 , subject to two six month extensions available at our option subject to compliance with terms of the Facility and payment of a customary extension fee. Upon the amended terms, the Company wrote off $0.3 million of debt issuance costs. At December 31, 2018 , we had an aggregate available borrowing capacity of $359.8 million under the Revolver, net of $0.2 million reserved for outstanding letters of credit. At December 31, 2018 , the applicable interest rate on the Revolver was one-month LIBOR plus 1.25% , or 3.75% (see Note 13 - "Subsequent Events"). (8) While we have interest rate swap agreements in place that fix the LIBOR portion of the rates as noted above, the spread over LIBOR could vary in the future based upon changes to the Company's credit ratings (see Note 13 - "Subsequent Events"). The following table presents the borrowings and paydowns on the Revolver during the years ended December 31, 2018 and December 31, 2017 : 2018 2017 Beginning Balance $ 155,000 $ 308,000 Borrowings 332,000 350,000 Paydowns (197,000 ) (503,000 ) Ending Balance $ 290,000 $ 155,000 During 2018, borrowings under the Revolver were primarily used for general corporate purposes. Paydowns of outstanding borrowings were funded using proceeds from property dispositions (see Note 4 - "Investment in Real Estate"), new mortgage activity as discussed above and cash flow from operations. During 2017, borrowings under the Revolver were primarily used for general corporate purposes. Paydowns of outstanding borrowings were funded using proceeds from property dispositions (see Note 4 - "Investment in Real Estate"), the O'Connor Joint Venture II transaction (see Note 5 - "Investment in Unconsolidated Entities, at Equity"), including certain mortgage notes executed prior to the deconsolidation, and cash flow from operations. Covenants Our unsecured debt agreements contain financial and other covenants. If we were to fail to comply with these covenants, after the expiration of the applicable cure periods, the debt maturity could be accelerated or other remedies could be sought by the lender including adjustments to the applicable interest rate. As of December 31, 2018 , management believes the Company is in compliance with all covenants of its unsecured debt. The total balance of mortgages was approximately $980.3 million as of December 31, 2018 . At December 31, 2018 , certain of our consolidated subsidiaries were the borrowers under 21 non-recourse loans and two full-recourse loans secured by mortgages encumbering 26 properties, including one separate pool of cross-defaulted and cross-collateralized mortgages encumbering a total of four properties. Under these cross-default provisions, a default under any mortgage included in the cross-defaulted pool may constitute a default under all mortgages within that pool and may lead to acceleration of the indebtedness due on each property within the pool. Certain of our secured debt instruments contain financial and other non-financial covenants which are specific to the properties which serve as collateral for that debt. Our existing non-recourse mortgage loans generally prohibit our subsidiaries that are borrowers thereunder from incurring additional indebtedness, subject to certain customary and limited exceptions. In addition, certain of these instruments limit the ability of the applicable borrower's parent entity from incurring mezzanine indebtedness unless certain conditions are satisfied, including compliance with maximum loan to value ratio and minimum debt service coverage ratio tests. Further, under certain of these existing agreements, if certain cash flow levels in respect of the applicable mortgaged property (as described in the applicable agreement) are not maintained for at least two consecutive quarters, the lender could accelerate the debt and enforce its right against its collateral. If the borrower fails to comply with these covenants, the lender could accelerate the debt and enforce its right against their collateral. On November 19, 2018 , we received a notice of default letter, dated November 15, 2018 , from the special servicer to the borrower, a consolidated subsidiary of WPG L.P., concerning the $49.9 million mortgage loan secured by West Ridge Mall and West Ridge Plaza, located in Topeka, Kansas (collectively known as "West Ridge"). The notice was issued by the special servicer because the borrower did not make certain reserve payments or deposits as required by the loan agreement for the aforementioned loan. The borrower has initiated discussions with the special servicer regarding this non-recourse loan and is considering various options. The Company will continue to manage and lease the property. On May 29, 2018 , we received a notice of default letter, dated May 25, 2018 , from the special servicer to the borrower, a consolidated subsidiary of WPG L.P., concerning the $94.0 million mortgage loan secured by Rushmore Mall ("Rushmore"). The notice was issued by the special servicer because the borrower notified the lender that there were insufficient funds to ensure future compliance with the mortgage loan due to the loss of certain tenants at Rushmore. On October 23, 2018 , an affiliate of the Company transitioned the property to the lender. On April 11, 2018 , we received a notice of default letter, dated April 6, 2018 , from the special servicer to the borrower, a consolidated subsidiary of WPG L.P., concerning the $45.2 million mortgage loan secured by Towne West Square, located in Wichita, Kansas. The notice was issued by the special servicer because the borrower did not make certain reserve payments or deposits as required by the loan agreement for the aforementioned loan. On August 24, 2018, we received notification that a receiver had been appointed to manage and lease the property. An affiliate of the Company still holds title to the property. On March 30, 2017, the Company transferred the $40.0 million mortgage loan secured by Valle Vista Mall to the special servicer at the request of the borrower, a consolidated subsidiary of the Company. On May 18, 2017, we received a notice of default letter, dated that same date, from the special servicer because the borrower did not repay the loan in full by its May 10, 2017 maturity date. On October 3, 2017, an affiliate of WPG Inc. transitioned the property to the lender. On June 6, 2016, we received a notice of default letter, dated June 3, 2016, from the special servicer to the borrower of the $99.7 million mortgage loan secured by Southern Hills Mall. The letter was sent because the borrower, a consolidated subsidiary of the Company, did not repay the loan in full by its June 1, 2016 maturity date. On October 27, 2016, we received notification that a receiver has been appointed to manage and lease the property. On October 17, 2017, an affiliate of WPG Inc. completed a discounted payoff of the mortgage loan for $55.0 million and retained ownership and management of the property. On June 30, 2016, we received a notice, dated that same date, that the $87.3 million mortgage loan secured by Mesa Mall had been transferred to the special servicer due to the payment default that occurred when the borrower, a consolidated subsidiary of the Company, did not repay the loan in full by its June 1, 2016 maturity date. On April 25, 2017, the Company completed a discounted payoff of the mortgage loan for $63.0 million and retained ownership and management of the property. On August 8, 2016, we received a notice of default letter, dated August 4, 2016, from the special servicer to the borrower concerning the $44.9 million mortgage loan secured by River Valley Mall. The letter was sent because the borrower, a consolidated subsidiary of the Company, did not repay the loan in full by its January 11, 2016 maturity date. On December 29, 2016, we transferred title of the property to the mortgage lender pursuant to the terms of a deed-in-lieu of foreclosure agreement entered into by the Company's affiliate and the mortgage lender. On October 8, 2015, we received a notice of default letter, dated October 5, 2015, from the special servicer to the borrower of the $52.9 million mortgage loan secured by Merritt Square Mall. The letter was sent because the borrower, a consolidated subsidiary of the Company, did not repay the loan in full by its September 1, 2015 maturity date. On May 25, 2016, the trustee on behalf of the mortgage lender conducted a non-judicial foreclosure sale of Merritt Square Mall, in which the Company's affiliate previously held a 100% ownership interest. The mortgage lender was the successful bidder at the sale and ownership transferred on June 9, 2016. The Company managed the property through and including July 31, 2016. On October 30, 2015, we received a notice of default letter, dated that same date, from the special servicer to the borrower concerning the $62.4 million mortgage loan that matures on February 1, 2017 and was secured by Chesapeake Square. The default resulted from an operating cash flow shortfall at the property in October 2015 that the borrower, a consolidated subsidiary of the Company, did not cure. On April 21, 2016, the trustee on behalf of the mortgage lender conducted a non-judicial foreclosure of Chesapeake Square, in which the Company's affiliate previously held majority ownership interest. The mortgage lender was the successful bidder at the sale and ownership transferred on April 28, 2016. At December 31, 2018 , management believes the applicable borrowers under our other non-recourse mortgage loans were in compliance with all covenants where non-compliance could individually, or giving effect to applicable cross-default provisions in the aggregate, have a material adverse effect on our financial condition, results of operations or cash flows. The Company has assessed each of the defaulted properties for impairment indicators and have concluded no impairment charges were warranted as of December 31, 2018 . Gain on Extinguishment of Debt, Net During the year ended December 31, 2018, the Company recognized a net gain of $51.4 million related to the $94.0 million mortgage debt cancellation and ownership transfer of Rushmore Mall, which is included in gain on extinguishment of debt, net in the consolidated statements of operations and comprehensive income for the year then ended. During the year ended December 31, 2017, the Company recognized a net gain of $90.6 million based on the cancellation of mortgage debt of $108.9 million related to discounted payoff of the mortgage note payable secured by Southern Hills Mall, ownership transfer of Valle Vista Mall, and discounted payoff of the mortgage note payable secured by Mesa Mall, which is included in gain on extinguishment of debt, net in the consolidated statements of operations and comprehensive income for the year then ended. During the year ended December 31, 2016, the Company recognized a net gain of $34.6 million related to the $160.1 million mortgage debt cancellation and ownership transfers of River Valley Mall, Merritt Square Mall, and Chesapeake Square, which is included in gain on extinguishment of debt, net in the consolidated statements of operations and comprehensive income for the year then ended. Debt Maturity and Cash Paid for Interest Scheduled principal repayments on indebtedness (including extension options) as of December 31, 2018 are as follows: 2019 $ 64,281 2020 344,584 2021 320,513 2022 771,856 2023 404,121 Thereafter 1,054,921 Total principal maturities 2,960,276 Bond Discount (9,680 ) Fair value adjustments, net 5,764 Debt issuance costs, net (18,883 ) Total mortgages and unsecured indebtedness $ 2,937,477 Cash paid for interest for the years ended December 31, 2018, 2017 and 2016 was $141,641 , $107,609 and $125,999 , respectively. Fair Value of Debt The carrying values of our variable-rate loans approximate their fair values. We estimate the fair values of fixed-rate mortgages and fixed-rate unsecured debt (including variable-rate unsecured debt swapped to fixed-rate) using cash flows discounted at current borrowing rates or Level 2 inputs. We estimate the fair values of consolidated fixed-rate unsecured notes payable using quoted market prices, or, if no quoted market prices are available, we use quoted market prices for securities with similar terms and maturities or Level 1 inputs. The book value and fair value of these financial instruments along with the related discount rate assumptions as of December 31, 2018 and 2017 are summarized as follows: 2018 2017 Book value of fixed- rate mortgages (1) $ 915,276 $ 1,000,936 Fair value of fixed-rate mortgages $ 928,129 $ 1,024,890 Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages 4.57 % 4.19 % Book value of fixed-rate unsecured debt (1) $ 1,590,000 $ 1,610,000 Fair value of fixed-rate unsecured debt $ 1,485,672 $ 1,616,810 Weighted average discount rates assumed in calculation of fair value for fixed-rate unsecured debt 5.62 % 4.27 % (1) Excludes deferred financing fees and applicable debt discounts.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. 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 through the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the payment of future uncertain cash amounts, the value of which are determined by interest rates. The Company's derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company's known or expected cash payments related to the Company's borrowings. Cash Flow Hedges of Interest Rate Risk The Company's objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps or caps as part of its interest rate risk management strategy. Interest rate swaps involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The Company may also enter into forward starting swaps or treasury lock agreements to set the effective interest rate on a planned fixed-rate financing. In a forward starting swap or treasury lock agreement that the Company cash settles in anticipation of a fixed rate financing or refinancing, the Company will receive or pay an amount equal to the present value of future cash flow payments based on the difference between the contract rate and market rate on the settlement date. On January 1, 2018 , the Company adopted ASU 2017-12, as permitted under the standard (see Note 3 - "Summary of Significant Accounting Policies" for additional details). For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in other comprehensive income ("OCI") or other comprehensive loss (“OCL”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. Net realized gains or losses resulting from derivatives that were settled in conjunction with planned fixed-rate financings or refinancings continue to be included in accumulated other comprehensive income ("AOCI") during the term of the hedged debt transaction. Amounts reported in AOCI relate to derivatives that will be reclassified to interest expense as interest payments are made on the Company's variable-rate debt. Realized gains or losses on settled derivative instruments included in AOCI are recognized as an adjustment to income over the term of the hedged debt transaction. During the next twelve months, the Company estimates that an additional $2.4 million will be reclassified as a decrease to interest expense. On August 4, 2017, the Company terminated six interest rate derivatives and partially terminated one interest rate derivative with an aggregate notional amount of $430,000 , upon the repayment of the Term Loan and partial repayment of the June 2015 Term Loan, receiving cash proceeds of approximately $2.0 million upon settlement. On May 9, 2018 , the Company entered into four three -year swaps, totaling $250.0 million with an effective date of June 29, 2018 , to replace two three -year swaps totaling $270.0 million , which matured on June 30, 2018 . As of December 31, 2018 , the Company had 10 outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk with a notional value of $590,000 . The table below presents the fair value of the Company's derivative financial instruments as well as their classification on the consolidated balance sheet as of December 31, 2018 and 2017 : Derivatives designated as hedging instruments: Balance Sheet December 31, 2018 December 31, 2017 Interest rate products Asset Derivatives Deferred costs and other assets $ 9,306 $ 7,413 Interest rate products Liability Derivatives Accounts payable, accrued expenses, intangibles and deferred revenues $ 1,913 $ — The asset derivative instruments were reported at their fair value of $9,306 and $7,413 in deferred costs and other assets at December 31, 2018 and 2017 , respectively, with a corresponding adjustment to OCI for the unrealized gains and losses (net of noncontrolling interest allocation). The liability derivative instruments were reported at their fair value $1,913 and $0 in accounts payable, accrued expenses, intangibles, and deferred revenues at December 31, 2018 and 2017 , respectively, with a corresponding adjustment to OCL for the unrealized gains and losses (net of noncontrolling interest allocation). Over time, the unrealized gains and losses held in AOCI will be reclassified to earnings. This reclassification will correlate with the recognition of the hedged interest payments in earnings. The table below presents the effect of the Company's derivative financial instruments on the consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 : Derivatives in Cash Flow Hedging Relationships Location of Gain or (Loss) Recognized in Income on Derivatives For the Year Ended December 31, 2018 2017 2016 Amount of Gain or (Loss) Recognized in OCI on Derivative $ 1,054 $ 1,256 $ (3,580 ) Amount of Gain or (Loss) Reclassified from AOCI into Income Interest expense $ (2,338 ) $ 1,145 $ 7,381 The table below presents the effect of the Company's derivative financial instruments on the consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 : Effect of Cash Flow Hedges on Consolidated Statements of Operations For the year ended December 31, 2018 2017 2016 Total interest (expense) presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded $ (141,987 ) $ (126,541 ) $ (136,225 ) Amount of (gain) loss reclassified from accumulated other comprehensive income into interest expense $ (2,338 ) $ 1,145 $ 7,381 Credit Risk-Related Contingent Features The Company has agreements with each of its derivative counterparties that contain a provision that if the Company either defaults or is capable of being declared in default on any of its consolidated indebtedness, then the Company could also be declared in default on its derivative obligations. The Company has agreements with its derivative counterparties that incorporate the loan covenant provisions of the Company's indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with the loan covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement. As of December 31, 2018 , the fair value of derivatives in a net liability position, plus accrued interest but excluding any adjustment for nonperformance risk, related to these agreements was $1,913 . As of December 31, 2018 , the Company has not posted any collateral related to these agreements. The Company is not in default with any of these provisions. If the Company had breached any of these provisions at December 31, 2018 , it would have been required to settle its obligation under these agreements at their termination value of $1,913 . Fair Value Considerations Currently, the Company uses interest rate swaps and caps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves, foreign exchange rates, and implied volatilities. Based on these inputs the Company has determined that its interest rate swap and cap valuations are classified within Level 2 of the fair value hierarchy. To comply with the provisions of Topic 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2018 and 2017 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. The tables below presents the Company’s net assets and liabilities measured at fair value as of December 31, 2018 and 2017 aggregated by the level in the fair value hierarchy within which those measurements fall: Quoted Prices in Active Markets for Identical Liabilities Significant Other Observable Inputs Significant Unobservable Inputs 3) Balance at December 31, 2018 Derivative instruments, net $ — $ 7,393 $ — $ 7,393 Quoted Prices in Active Markets for Identical Liabilities Significant Other Observable Inputs Significant Unobservable Inputs 3) Balance at December 31, 2017 Derivative instruments, net $ — $ 7,413 $ — $ 7,413

Equity

Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Equity	Equity Preferred Stock Series H Cumulative Redeemable Preferred Stock On January 15, 2015, WPG Inc. issued 4,000,000 shares of 7.5% Series H Cumulative Redeemable Preferred Stock (the "Series H Preferred Shares") to convert the preferred stock of GRT outstanding at the time of merger. Dividends accrue quarterly at an annual rate of 7.5% per share. WPG Inc. can redeem this series, in whole or in part, at a redemption price of $25.00 per share, plus accumulated and unpaid dividends. WPG L.P. issued to WPG Inc. a like number of preferred units as consideration for the Series H Preferred Shares and can redeem this series, in whole or in part, when WPG Inc. can redeem the Series H Preferred Shares at like terms. All shares remain issued and outstanding as of December 31, 2018 and 2017 . Series I Cumulative Redeemable Preferred Stock On January 15, 2015, WPG Inc. issued 3,800,000 shares of 6.875% Series I Cumulative Redeemable Preferred Stock (the "Series I Preferred Shares") to convert the preferred stock of GRT outstanding at the time of merger. Dividends accrue quarterly at an annual rate of 6.875% per share. WPG Inc. can redeem this series, in whole or in part, at a redemption price of $25.00 per share, plus accumulated and unpaid dividends. WPG L.P. issued to WPG Inc. a like number of preferred units as consideration for the Series I Preferred Shares and can redeem this series, in whole or in part, when WPG Inc. can redeem the Series I Preferred Shares at like terms. All shares remain issued and outstanding as of December 31, 2018 and 2017 . Exchange Rights Subject to the terms of the limited partnership agreement of WPG L.P., limited partners in WPG L.P. have, at their option, the right to exchange all or any portion of their units for shares of WPG Inc. common stock on a one‑for‑one basis or cash, as determined by WPG Inc. Therefore, the common units held by limited partners are considered by WPG Inc. to be share equivalents and classified as noncontrolling interests within permanent equity, and classified by WPG L.P. as permanent equity. The amount of cash to be paid if the exchange right is exercised and the cash option is selected will be based on the market value of WPG Inc.'s common stock as determined pursuant to the terms of the WPG L.P. Partnership Agreement. During the year ended December 31, 2017, WPG Inc. issued 314,577 shares of common stock to a limited partner of WPG L.P. in exchange for an equal number of units pursuant to the WPG L.P. Partnership Agreement. This transaction increased WPG Inc.’s ownership interest in WPG L.P. There were no similar transactions during the years ended December 31, 2018 and 2016. At December 31, 2018 , WPG Inc. had reserved 34,755,660 shares of common stock for possible issuance upon the exchange of units held by limited partners. The holders of the Series I-1 Preferred Units have, at their option, the right to have their units purchased by WPG L.P. subject to the satisfaction of certain conditions. Therefore, the Series I-1 Preferred Units are classified as redeemable noncontrolling interests outside of permanent equity. Share Based Compensation On May 28, 2014, the Board adopted the Washington Prime Group, L.P. 2014 Stock Incentive Plan (the "Plan"), which permits the Company to grant awards to current and prospective directors, officers, employees and consultants of the Company or any affiliate. An aggregate of 10,000,000 shares of common stock has been reserved for issuance under the Plan. In addition, the maximum number of awards to be granted to a participant in any calendar year is 500,000 shares/units. Awards may be in the form of stock options, stock appreciation rights, restricted stock, restricted stock units ("RSUs") or other stock-based awards in WPG Inc., long term incentive units ("LTIP units" or "LTIPs") or performance units ("Performance LTIP Units") in WPG L.P. The Plan terminates on May 28, 2024. Long Term Incentive Awards Time Vested LTIP Awards The Company has issued time-vested LTIP units ("Inducement LTIP Units") to certain executive officers and employees under the Plan, pursuant to LTIP Unit Award Agreements between the Company and each of the grant recipients. These awards will vest and the related fair value will be expensed over a four -year vesting period. During the years ended December 31, 2018, 2017 and 2016 , the Company did not grant any Inducement LTIP Units. As of December 31, 2018 , the estimated future compensation expense for Inducement LTIP Units was $38 . The weighted average period over which the compensation expense will be recorded for the Inducement LTIP Units is approximately 0.2 years. A summary of the Inducement LTIP Units and changes during the year ended December 31, 2018 is listed below: Activity for the Year Ended December 31, 2018 Inducement LTIP Units Weighted Outstanding unvested at beginning of year 37,868 $ 17.82 Units granted — $ — Units vested (25,036 ) $ 17.97 Units forfeited — $ — Outstanding unvested at end of year 12,832 $ 17.53 During the year ended December 31, 2017, 29,685 LTIP Units, with a weighted average grant date fair value per share of $18.33 , vested. During the year ended December 31, 2016, 189,755 LTIP Units, with a weighted average grant date fair value per share of $18.07 , vested. Performance Based Awards 2015 Awards During 2015, the Company authorized the award of LTIP units subject to certain market conditions under ASC 718 ("Performance LTIP Units") to certain executive officers and employees of the Company in the maximum total amount of 304,818 units, to be earned and related fair value expensed over the applicable performance periods, except in certain instances that could result in accelerated vesting due to severance arrangements. The Performance LTIP Units that were allocated during the year ended December 31, 2015 are market based awards with a service condition. Recipients could have earned between 0% - 100% of the award based on the Company's achievement of absolute and relative (versus the MSCI REIT Index) total shareholder return ("TSR") goals, with 40% of the Performance LTIP Units available to be earned with respect to each performance period based on achievement of absolute TSR goals, and 60% of the Performance LTIP Units available to be earned with respect to each performance period based on achievement of relative TSR goals. The Performance LTIP Units issued during 2015 relate to the following performance periods: from the beginning of the service period to (i) December 31, 2016 ("2015-First Special PP"), (ii) December 31, 2017 ("2015-Second Special PP"), and (iii) December 31, 2018 ("2015-Third Special PP"). There was no award for the 2015-First Special PP, 2015-Second Special PP, or 2015-Third Special PP since our TSR was below the threshold level during 2016, 2017, and 2018, respectively. Annual Long-Term Incentive Awards During the years ended December 31, 2018 and 2017 , the Company approved the terms and conditions of the 2018 and 2017 annual awards (the "2018 Annual Long-Term Incentive Awards" and "2017 Long-Term Incentive Awards," respectively) for certain executive officers and employees of the Company. Under the terms of the awards program, each participant is provided the opportunity to receive (i) time-based RSUs and (ii) performance-based stock units ("PSUs"). RSUs represent a contingent right to receive one WPG Inc. common share for each vested RSU. RSUs will vest in one-third installments on each annual anniversary of the respective Grant Date (as referenced below), subject to the participant's continued employment with the Company through each vesting date and the participant's continued compliance with certain applicable covenants. During the service period, dividend equivalents will be paid with respect to the RSUs corresponding to the amount of any dividends paid by the Company to the Company's common shareholders for the applicable dividend payment dates. Compensation expense is recognized on a straight-line basis over the three year vesting term, except in instances that result in accelerated vesting due to severance arrangements. Actual PSUs earned may range from 0% - 150% of the PSUs allocated to the award recipient, based on the Company's TSR compared to a peer group based on companies with similar assets and revenue over a three -year performance period that commenced on the respective Grant Date (as referenced below). During the performance period, dividend equivalents corresponding to the amount of any regular cash dividends paid by the Company to the Company’s common shareholders for the applicable dividend payment dates will accrue and be deemed reinvested in additional PSUs, which will be settled in common shares at the same time and only to the extent that the underlying PSU is earned and settled in common shares. Payout of the PSUs is also subject to the participant’s continued employment with the Company through the end of the performance period. The PSUs were valued through the use of a Monte Carlo model and the related compensation expense is recognized over the three -year performance period, except in instances that result in accelerated amortization due to severance arrangements. The following table summarizes the issuance of the 2018 Annual Long-Term Incentive Awards and 2017 Annual Long-Term Incentive Awards, respectively: 2018 Annual Long-Term Incentive Awards 2017 Annual Long-Term Incentive Awards Grant Date February 20, 2018 February 21, 2017 RSUs issued 587,000 358,198 Grant date fair value per unit $6.10 $9.58 PSUs issued 587,000 358,198 Grant date fair value per unit $4.88 $7.72 The following table summarizes the assumptions used to value the PSUs under a Monte Carlo simulation model: 2018 Annual Long-Term Incentive Awards 2017 Annual Long-Term Incentive Awards Risk free rate 2.39% 1.49% Volatility 24.70% 20.52% Dividend yield 16.39% 10.44% During 2016, the Company approved the performance criteria and maximum dollar amount of the 2016 annual awards (the "2016 Annual Long-Term Incentive Awards"), that generally range from 30% - 100% of actual base salary, for certain executive officers and employees of the Company. The number of awards was determined by converting the cash value of the award to a number of RSUs (the "Allocated RSUs") based on the closing price of WPG Inc.'s common shares for the final 15 trading days of 2016. Eventual recipients were eligible to receive a percentage of the Allocated RSUs based on the Company's performance on its strategic goals detailed in the Company's 2016 cash bonus plan and the Company's relative TSR compared to a peer group based on companies with similar assets and revenue. Payout for 50% of the Allocated RSUs was based on the Company's performance on the strategic goals and the payout on the remaining 50% was based on the Company's TSR performance. Both the strategic goal component as well as the TSR performance were achieved at target, resulting in a 100% payout. During the year ended December 31, 2017, the Company awarded 324,237 Allocated RSUs, with a grant date fair value of $2.2 million , related to the 2016 Annual Long-Term Incentive Awards, which will vest in one-third installments on each of February 21, 2018, 2019 and 2020, except in instances that result in accelerated vesting due to severance arrangements. During 2015, the Company approved the performance criteria and maximum dollar amount of the 2015 annual LTIP unit awards (the "2015 Annual Long-Term Incentive Awards"), that generally range from 30% - 300% of actual base salary earnings, for certain executive officers and employees of the Company. The number of awards was determined by converting the cash value of the award to a number of LTIP units (the "Allocated Units") based on the closing price of WPG Inc.'s common shares for the final 15 trading days of 2015. Eventual recipients were eligible to receive a percentage of the Allocated Units based on the Company's performance on its strategic goals detailed in the Company's 2015 cash bonus plan and the Company's relative TSR compared to the MSCI REIT Index. Payout for 40% of the Allocated Units was based on the Company's performance on the strategic goals and the payout on the remaining 60% was based on the Company's TSR performance. The strategic goal component was achieved in 2015; however, the TSR was below threshold performance, resulting in only a 40% payout for this annual LTIP award. During the year ended December 31, 2016, the Company awarded 323,417 LTIP units related to the 2015 Annual Long-Term Incentive Awards, of which 108,118 vest in one-third installments on each of January 1, 2017, 2018 and 2019. The 94,106 LTIP units awarded to our former Executive Chairman fully vested on the grant date and the 121,193 LTIP units awarded to certain former executive officers fully vested on the applicable severance dates during 2016 pursuant to the underlying severance arrangements. The fair value of the portion of the awards based upon the Company's performance of the strategic goals was recognized to expense when granted. The 2016 and 2015 Annual Long-Term Incentive Awards that are based upon TSR were calculated using a Monte Carlo simulation model. The total amount of compensation to be recognized over the performance period, and the assumptions used to value the 2016 and 2015 Annual Long-Term Incentive Awards are provided below: 2016 2015 Fair value per share of Allocated RSUs/Units $ 3.81 $ 7.07 Total amount to be recognized over the performance period $ 2,516 $ 4,656 Risk free rate 0.44 % 0.20 % Volatility 31.40 % 22.66 % Dividend yield 10.05 % 6.03 % WPG Restricted Share Awards The WPG Restricted Shares relate to unvested restricted shares held by certain GRT executive employees at the time of merger. The amount of compensation expense related to unvested restricted shares that we expect to recognize in future periods is $33 over a weighted average period of 0.3 years. During the year ended December 31, 2018 , the aggregate intrinsic value of shares that vested was $44 . A summary of the status of the WPG Restricted Shares at December 31, 2018 and changes during the year are presented below: Activity for the Year Ended December 31, 2018 Restricted Weighted Outstanding at beginning of year 30,535 $ 18.18 Shares granted — $ — Shares vested/forfeited (21,502 ) $ 18.18 Outstanding at end of year 9,033 $ 18.18 There were no restricted shares granted during the years ended December 31, 2018, 2017 and 2016 . The total original fair value of the restricted shares vested during the years ended December 31, 2018, 2017 and 2016 was $391 , $2,182 , and $14,115 , respectively. WPG Restricted Stock Unit Awards The Company issues RSUs to certain executive officers, employees, and non-employee directors of the Board. During the years ended December 31, 2018, 2017 and 2016 , the Company issued 812,440 , 843,435 and 518,112 RSUs, respectively. Of the 812,440 RSUs issued in 2018, 587,000 RSUs with a fair value of $3.6 million relates to the annual long-term incentive award issuances that occurred in February 2018 (see "Annual Long-Term Incentive Awards" section above). Of the 843,435 RSUs issued in 2017, 682,435 RSUs with a fair value of $5.6 million relates to the annual long-term incentive award issuances that occurred in February 2017 (see "Annual Long-Term Incentive Awards" section above). Of the 518,112 RSUs issued in 2016, 284,483 RSUs with a fair value of $3.3 million relates to Mr. Louis G. Conforti's appointment as the Company's CEO in October 2016. The RSUs are service-based awards and the related fair value is expensed over the applicable service periods, except in instances that result in accelerated vesting due to severance arrangements. The amount of compensation related to the unvested RSUs that we expect to recognize in future periods is $6.6 million over a weighted average period of 1.5 years. A summary of the status of the WPG RSUs at December 31, 2018 and changes during the year are presented below: Activity for the Year Ended December 31, 2018 RSUs Weighted Outstanding unvested at beginning of year 1,157,576 $ 9.40 RSUs granted 812,440 $ 6.28 RSUs vested/forfeited (400,703 ) $ 8.29 Outstanding unvested at end of year 1,569,313 $ 8.07 The weighted average grant date fair value per share of RSUs granted during the years ended December 31, 2018, 2017 and 2016 was $6.28 , $8.07 , and $11.48 , respectively. The total fair value of the RSUs vested during the years ended December 31, 2018, 2017 and 2016 was $3,320 , $1,128 , and $1,082 , respectively. Stock Options Options granted under the Company's Plan generally vest over a three year period, with options exercisable at a rate of 33.3% per annum beginning with the first anniversary on the date of the grant. These options were valued using the Black-Scholes pricing model and the expense associated with these options are amortized over the requisite vesting period. There were no options granted during the years ended December 31, 2018 and 2017. During the year ended December 31, 2016, the Company granted 247,500 options to employees. The weighted average grant date fair value was $0.62 . A summary of the status of the Company's option plans at December 31, 2018 and changes during the year are listed below: Activity for the Year Ended December 31, 2018 Stock Options Weighted Outstanding at beginning of year 794,014 $ 2.26 Options granted — $ — Options exercised — $ — Options forfeited/expired (114,273 ) $ 3.36 Outstanding at end of year 679,741 $ 2.08 The fair value of each option grant was the date of the grant using the Black-Scholes options pricing mode. The weighted average per share value of options granted as well as the assumptions used to value the grants is listed below: 2016 Weighted average per share value of options granted/converted $ 0.62 Weighted average risk free rates 1.4 % Expected average lives in years 6.0 years Annual dividend rates $ 1.00 Weighted average volatility 28.3 % Forfeiture rate 10 % The following table summarizes information regarding the options outstanding at December 31, 2018 : Options Outstanding Options Exercisable Range of Number Weighted Weighted Number Weighted Weighted $1.79 2,348 0.2 $1.79 2,348 0.2 $1.79 $5.76 14,758 1.2 $5.76 14,758 1.2 $5.76 $11.97 36,267 2.3 $11.97 36,267 2.3 $11.97 $12.67 55,419 3.4 $12.67 55,419 3.4 $12.67 $16.56 105,381 4.4 $16.56 105,381 4.4 $16.56 $13.10 72,068 5.3 $13.10 72,068 5.3 $13.10 $14.28 226,000 6.4 $14.28 226,000 6.4 $14.28 $9.95 167,500 7.4 $9.95 111,663 7.4 $9.95 679,741 5.6 $12.96 623,904 5.4 $13.23 The following table summarizes the aggregate intrinsic value of options that are: outstanding, exercisable and exercised. It also depicts the fair value of options that have vested. For the Year Ended December 31, 2018 Aggregate intrinsic value of options outstanding $ 7 Aggregate intrinsic value of options exercisable $ 7 Aggregate intrinsic value of options exercised $ — Aggregate fair value of options vested $ 154 The aggregate intrinsic value of options that exercised and the aggregate fair value of options that vested during the year ended December 31, 2017 was $12 and $187 , respectively. The aggregate intrinsic value of options that exercised and the aggregate fair value of options that vested during the year ended December 31, 2016 was $163 and $191 , respectively. Share Award Related Compensation Expense During the years ended December 31, 2018, 2017 and 2016 , the Company recorded share award related compensation expense pertaining to the award and option plans noted above within the consolidated statements of operations and comprehensive income as indicated below (amounts in millions): For the Year Ended December 31, 2018 2017 2016 Merger, restructuring and transaction costs $ — $ — $ 9.5 General and administrative and property operating 8.3 6.4 4.6 Total expense $ 8.3 $ 6.4 $ 14.1 Distributions During the years ended December 31, 2018 and 2017 , the Board declared common share/unit dividends of $1.00 per common share/unit, respectively.

Rentals Under Operating Leases

Rentals Under Operating Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Rentals under Operating Leases	Rentals under Operating Leases Future minimum rentals to be received under non-cancelable operating leases for each of the next five years and thereafter, excluding tenant reimbursements of operating expenses and percentage rent based on tenant sales volume, as of December 31, 2018 are as follows: 2019 $ 401,604 2020 336,602 2021 270,936 2022 222,569 2023 175,206 Thereafter 423,765 $ 1,830,682

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation We are involved from time-to-time in various legal proceedings that arise in the ordinary course of our business, including, but not limited to commercial disputes, environmental matters, and litigation in connection with transactions including acquisitions and divestitures. We believe that such litigation, claims and administrative proceedings will not have a material adverse impact on our financial position or our results of operations. We record a liability when a loss is considered probable and the amount can be reasonably estimated. Lease Commitments As of December 31, 2018 , a total of four consolidated properties are subject to ground leases. The termination dates of these ground leases range from 2026 to 2076. These ground leases generally require us to make fixed annual rental payments, or a fixed annual rental plus a percentage rent component based upon the revenues or total sales of the property. Some of these leases also include escalation clauses and renewal options. We incurred ground lease expense, which is included in ground rent in the accompanying consolidated statements of operations and comprehensive income, for the years ended December 31, 2018, 2017 and 2016 of $789 , $2,438 and $4,318 , respectively. Additionally, the Company has two material office leases and one material garage lease. The termination dates of these leases range from 2023 to 2026. These leases generally require us to make fixed annual rental payments, plus our share of common-area maintenance expense and real estate taxes and insurance. We incurred lease expense, which is included in general and administrative expenses in the accompanying consolidated statements of operations and comprehensive income, for the years ended December 31, 2018, 2017 and 2016 of $2,668 , $2,397 , and $2,160 , respectively. Future minimum lease payments due under these leases for each of the next five years and thereafter, excluding applicable extension options, as of December 31, 2018 are as follows: 2019 $ 2,029 2020 2,049 2021 2,069 2022 2,099 2023 1,427 Thereafter 21,377 $ 31,050 Concentration of Credit Risk Our properties rely heavily upon anchor or major tenants to attract customers; however, these retailers do not constitute a material portion of our financial results. Additionally, many anchor retailers in the enclosed retail properties own their spaces further reducing their contribution to our operating results. All operations are within the United States and no customer or tenant accounts for 5% or more of our consolidated revenues.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Transactions with SPG The Company was formed in 2014 through a spin-off of certain properties from SPG. SPG managed the day-to-day operations of our legacy SPG enclosed retail properties through February 29, 2016 in accordance with property management agreements that expired as of May 31, 2016. Additionally, WPG and SPG entered into a transition services agreement pursuant to which SPG provided to WPG, on an interim, transitional basis after May 28, 2014 through May 31, 2016, the date on which it was terminated, various services including administrative support for the open air properties through December 31, 2015, information technology, property management, accounts payable and other financial functions, as well as engineering support, quality assurance support and other administrative services for the enclosed retail properties until March 1, 2016. Under the transition services agreement that terminated on May 31, 2016, SPG charged WPG, based upon SPG's allocation of certain shared costs such as insurance premiums, advertising and promotional programs, leasing and development fees. Amounts charged to expense for property management and common costs, services, and other as well as insurance premiums are included in property operating expenses in the consolidated statements of operations and comprehensive income. Additionally, leasing and development fees charged by SPG were capitalized by the property. WPG terminated the transition services agreement, all applicable property management agreements with SPG, and the property development agreement effective May 31, 2016. We did not incur any charges pertaining to the transition services agreements for the years ended December 31, 2018 and 2017. Charges for properties which for the year ended December 31, 2016 are as follows: For the Year Ended December 31, 2016 Consolidated Unconsolidated Property management and common costs, services and other $ 8,791 $ 196 Insurance premiums $ — $ — Advertising and promotional programs $ 102 $ 6 Capitalized leasing and development fees $ 3,166 $ 23 Consulting Agreement with Mark S. Ordan Mr. Mark S. Ordan served as a member of the Board until May 18, 2017 at which time his term on the Board expired and he retired from service. During 2017, Mr. Ordan and the Company were parties to a Consulting Agreement in which Mr. Ordan provided consulting services to the Company for a fee. The Consulting Agreement was terminated on May 28, 2017. During 2017, the Company paid Mr. Ordan approximately $0.2 million in fees under the Consulting Agreement. The Company has no further payment obligations under the Consulting Agreement.

Earnings Per Common Share_Unit

Earnings Per Common Share/Unit	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share/Unit	Earnings Per Common Share/Unit WPG Inc. Earnings Per Common Share We determine WPG Inc.'s basic earnings per common share based on the weighted average number of shares of common stock outstanding during the period and we consider any participating securities for purposes of applying the two-class method. We determine WPG Inc.'s diluted earnings per share based on the weighted average number of shares of common stock outstanding combined with the incremental weighted average shares that would have been outstanding assuming all potentially dilutive securities were converted into common shares at the earliest date possible. The following table sets forth the computation of WPG Inc.'s basic and diluted earnings per common share: For the Year Ended December 31, 2018 2017 2016 Earnings Per Common Share, Basic: Net income attributable to common shareholders - basic $ 79,572 $ 183,031 $ 53,099 Weighted average shares outstanding - basic 187,696,339 186,829,385 185,633,582 Earnings per common share, basic $ 0.42 $ 0.98 $ 0.29 Earnings Per Common Share, Diluted: Net income attributable to common shareholders - basic $ 79,572 $ 183,031 $ 53,099 Net income attributable to common unitholders 14,735 34,222 10,034 Net income attributable to common shareholders - diluted $ 94,307 $ 217,253 $ 63,133 Weighted average common shares outstanding - basic 187,696,339 186,829,385 185,633,582 Weighted average operating partnership units outstanding 34,703,770 34,808,890 34,304,109 Weighted average additional dilutive securities outstanding 603,674 337,508 803,805 Weighted average common shares outstanding - diluted 223,003,783 221,975,783 220,741,496 Earnings per common share, diluted $ 0.42 $ 0.98 $ 0.29 For the years ended December 31, 2018, 2017 and 2016 , additional potentially dilutive securities include contingently-issuable outstanding stock options and performance based components of annual awards. We accrue distributions when they are declared. WPG L.P. Earnings Per Common Unit We determine WPG L.P.'s basic earnings per common unit based on the weighted average number of common units outstanding during the period and we consider any participating securities for purposes of applying the two-class method. We determine WPG L.P.'s diluted earnings per unit based on the weighted average number of common units outstanding combined with the incremental weighted average units that would have been outstanding assuming all potentially dilutive securities were converted into common units at the earliest date possible. The following table sets forth the computation of WPG L.P.'s basic and diluted earnings per common unit: For the Year Ended December 31, 2018 2017 2016 Earnings Per Common Unit, Basic and Diluted: Net income attributable to common unitholders - basic and diluted $ 94,307 $ 217,253 $ 63,133 Weighted average common units outstanding - basic 222,400,109 221,638,275 219,937,691 Weighted average additional dilutive securities outstanding 603,674 337,508 803,805 Weighted average shares outstanding - diluted 223,003,783 221,975,783 220,741,496 Earnings per common unit, basic and diluted $ 0.42 $ 0.98 $ 0.29 For the years ended December 31, 2018, 2017 and 2016 , additional potentially dilutive securities include contingently-issuable units related to WPG Inc.'s outstanding stock options and WPG Inc.'s performance based components of annual awards. We accrue distributions when they are declared.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 18, 2019, we completed the sale of the sixth tranche of restaurant outparcels to Four Corners. This tranche consisted of eight restaurant outparcels. Additionally, on February 11, 2019, we closed on the sale of one additional restaurant outparcel. The allocated purchase price was approximately $12.2 million , and the net proceeds of approximately $12.1 million were used to fund ongoing redevelopment efforts and for general corporate purposes. During the first quarter of 2019, Fitch Ratings & Moody's Investor Service lowered their credit rating on WPG L.P.'s unsecured long-term indebtedness, which will increase interest rates on our Facility (as defined in Note 6 - "Indebtedness"), December 2015 Term Loan, and 5.950% Notes due 2024 as of February 2, 2019. Due to the downgrade, our Revolver will bear interest at LIBOR plus 165 basis points (an increase of 40 basis points), our Term Loan will bear interest at LIBOR plus 190 basis points (an increase of 45 basis points), and our December 2015 Term Loan will bear interest at LIBOR plus 235 basis points (an increase of 55 basis points). Our 5.950% Notes due 2024 will bear interest at 6.450% (an increase of 50 basis points). Assuming the new pricing grid was effective January 1, 2018, the impact would have resulted in an increase in borrowing costs of approximately $8.5 million during 2018. On February 5, 2019, the Company’s Executive Vice President, Head of Open Air Centers, was terminated without cause from his position and received severance payments and other benefits pursuant to the terms and conditions of his employment agreement. In addition, the Company terminated, without cause, additional non-executive personnel in the Property Management department as part of an effort to reduce overhead costs. The Company expects to record aggregate severance charges of approximately $1.9 million , including $0.1 million of non-cash stock compensation in the form of accelerated vesting of equity incentive awards. On February 12, 2019, the Board declared common share/unit dividends of $0.25 per common share/unit. The dividend is payable on March 15, 2019 to shareholders/unitholders of record on March 4, 2019.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Quarterly 2018 and 2017 data is summarized in the table below. Quarterly amounts may not sum to annual amounts due to rounding. First Second Third Fourth 2018 Total revenue $ 180,340 $ 178,728 $ 179,916 $ 184,321 Net income $ 20,185 $ 15,519 $ 4,115 $ 68,836 Washington Prime Group Inc.: Net income attributable to the Company $ 17,524 $ 13,594 $ 3,971 $ 58,515 Net income attributable to common shareholders $ 14,016 $ 10,086 $ 463 $ 55,007 Earnings per common share—basic and diluted $ 0.07 $ 0.05 $ 0.00 $ 0.29 Washington Prime Group, L.P.: Net income attributable to unitholders $ 20,185 $ 15,519 $ 4,115 $ 68,836 Net income attributable to common unitholders $ 16,617 $ 11,951 $ 547 $ 65,192 Earnings per common unit—basic and diluted $ 0.07 $ 0.05 $ 0.00 $ 0.29 2017 Total revenue $ 202,394 $ 189,171 $ 179,320 $ 187,237 Net income (loss) $ 14,624 $ 164,500 $ (10,664 ) $ 63,133 Washington Prime Group Inc.: Net income (loss) attributable to the Company $ 12,810 $ 138,975 $ (8,395 ) $ 53,673 Net income (loss) attributable to common shareholders $ 9,302 $ 135,467 $ (11,903 ) $ 50,165 Earnings (loss) per common share—basic $ 0.05 $ 0.73 $ (0.06 ) $ 0.27 Earnings (loss) per common share—diluted $ 0.05 $ 0.72 $ (0.06 ) $ 0.27 Washington Prime Group, L.P.: Net income (loss) attributable to unitholders $ 14,624 $ 164,500 $ (10,664 ) $ 63,133 Net income (loss) attributable to common unitholders $ 11,056 $ 160,932 $ (14,232 ) $ 59,497 Earnings (loss) per common unit—basic $ 0.05 $ 0.73 $ (0.06 ) $ 0.27 Earnings (loss) per common unit—diluted $ 0.05 $ 0.72 $ (0.06 ) $ 0.27

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate and Accumulated Depreciation	SCHEDULE III Washington Prime Group Inc. and Washington Prime Group, L.P. Real Estate and Accumulated Depreciation December 31, 2018 (dollars in thousands) Initial Cost Cost Capitalized Gross Amounts At Name Location Encumbrances(3) Land Buildings and Land Buildings and Land Buildings and Total(1) Accumulated Date of Enclosed Retail Properties Anderson Mall Anderson, SC $ 17,891 $ 1,712 $ 15,227 $ 851 $ 19,982 $ 2,563 $ 35,209 $ 37,772 $ 23,377 1972 Ashland Town Center Ashland, KY 36,824 13,462 68,367 — 5,536 13,462 73,903 87,365 12,739 2015 Bowie Town Center Bowie (Wash, D.C.), MD — 2,479 60,322 235 9,932 2,714 70,254 72,968 39,699 2001 Boynton Beach Mall Boynton Beach (Miami), FL — 22,240 78,804 4,666 29,544 26,906 108,348 135,254 73,264 1996 Brunswick Square East Brunswick (New York), NJ 71,154 8,436 55,838 — 35,296 8,436 91,134 99,570 57,770 1996 Charlottesville Fashion Square Charlottesville, VA 46,099 — 54,738 — 18,814 — 73,552 73,552 43,711 1997 Chautauqua Mall Lakewood, NY — 3,116 9,641 — 19,327 3,116 28,968 32,084 17,554 1996 Chesapeake Square Theater Chesapeake (VA Beach), VA — 628 9,536 — (738 ) 628 8,798 9,426 2,162 1996 Clay Terrace Carmel (Indianapolis), IN — 39,030 115,207 43 8,815 39,073 124,022 163,095 22,408 2014 Cottonwood Mall Albuquerque, NM 97,203 10,122 69,958 5,042 20,239 15,164 90,197 105,361 49,900 1996 Dayton Mall Dayton, OH 80,421 10,899 160,723 — 3,027 10,899 163,750 174,649 22,388 2015 Edison Mall Fort Myers, FL — 11,529 107,350 — 34,178 11,529 141,528 153,057 80,587 1997 Georgesville Square Columbus, OH — 720 — — — 720 — 720 — 2015 Grand Central Mall Parkersburg, WV 39,598 18,956 89,736 — 11,799 18,956 101,535 120,491 20,627 2015 Great Lakes Mall Mentor (Cleveland), OH — 12,302 100,362 98 43,683 12,400 144,045 156,445 80,146 1996 Indian Mound Mall Newark, OH — 7,109 19,205 (252 ) 1,992 6,857 21,197 28,054 4,369 2015 Irving Mall Irving (Dallas), TX — 6,737 17,479 2,533 44,350 9,270 61,829 71,099 43,275 1971 Jefferson Valley Mall Yorktown Heights (New York), NY — 4,868 30,304 — 70,161 4,868 100,465 105,333 49,921 1983 Lima Mall Lima, OH — 7,659 35,338 — 15,950 7,659 51,288 58,947 32,979 1996 Lincolnwood Town Center Lincolnwood (Chicago), IL 48,662 7,834 63,480 — 7,684 7,834 71,164 78,998 56,644 1990 Lindale Mall Cedar Rapids, IA — 14,106 58,286 (1,096 ) 14,083 13,010 72,369 85,379 23,392 1998 Longview Mall Longview, TX — 259 3,567 3,320 22,498 3,579 26,065 29,644 8,791 1978 Mall at Fairfield Commons, The Beavercreek, OH — 18,194 175,426 (411 ) 20,928 17,783 196,354 214,137 30,830 2015 Maplewood Mall St. Paul (Minneapolis), MN — 17,119 80,758 — 26,707 17,119 107,465 124,584 52,724 2002 Markland Mall Kokomo, IN — — 7,568 3,005 28,315 3,005 35,883 38,888 13,559 1968 Melbourne Square Melbourne, FL — 15,762 55,891 4,160 40,593 19,922 96,484 116,406 53,851 1996 Mesa Mall Grand Junction, CO — 12,784 80,639 — 3,822 12,784 84,461 97,245 29,189 1998 Initial Cost Cost Capitalized Gross Amounts At Name Location Encumbrances(3) Land Buildings and Land Buildings and Land Buildings and Total(1) Accumulated Date of Morgantown Mall Morgantown, WV — 10,219 77,599 — 2,405 10,219 80,004 90,223 13,801 2015 Muncie Mall Muncie, IN 33,876 172 5,776 52 30,223 224 35,999 36,223 24,555 1970 New Towne Mall New Philadelphia, OH — 3,172 33,112 — 7,585 3,172 40,697 43,869 7,961 2015 Northtown Mall Blaine, MN — 18,603 57,341 — 6,881 18,603 64,222 82,825 12,860 2015 Northwoods Mall Peoria, IL — 1,185 12,779 2,689 52,009 3,874 64,788 68,662 39,432 1983 Oak Court Mall Memphis, TN 36,998 15,673 57,304 — 12,319 15,673 69,623 85,296 51,384 1997 Orange Park Mall Orange Park (Jacksonville), FL — 12,998 65,121 (267 ) 48,997 12,731 114,118 126,849 71,814 1994 Outlet Collection ® | Seattle, The Auburn (Seattle), WA — 38,751 107,094 — 13,263 38,751 120,357 159,108 21,622 2015 Paddock Mall Ocala, FL — 11,198 39,727 — 23,332 11,198 63,059 74,257 35,797 1996 Port Charlotte Town Center Port Charlotte, FL 42,196 5,471 58,570 — 18,478 5,471 77,048 82,519 51,342 1996 Rolling Oaks Mall San Antonio, TX — 1,929 38,609 — 17,630 1,929 56,239 58,168 39,023 1988 Southern Hills Mall Sioux City, IA — 15,025 75,984 4,566 4,141 19,591 80,125 99,716 27,806 1998 Southern Park Mall Youngstown, OH — 16,982 77,767 (236 ) 35,745 16,746 113,512 130,258 69,461 1996 Southgate Mall Missoula, MT 35,000 17,040 35,896 — 205 17,040 36,101 53,141 1,204 2018 Sunland Park Mall El Paso, TX — 2,896 28,900 (171 ) 7,887 2,725 36,787 39,512 29,040 1988 Town Center at Aurora Aurora (Denver), CO 52,250 9,959 56,832 9,974 58,923 19,933 115,755 135,688 81,675 1998 Towne West Square Wichita, KS 45,205 972 21,203 22 11,071 994 32,274 33,268 24,644 1980 Waterford Lakes Town Center Orlando, FL — 8,679 72,836 — 27,976 8,679 100,812 109,491 59,588 1999 Weberstown Mall Stockton, CA 65,000 9,909 92,589 — 4,988 9,909 97,577 107,486 14,723 2015 West Ridge Mall Topeka, KS 39,945 5,453 34,148 (788 ) 20,642 4,665 54,790 59,455 37,620 1988 Westminster Mall Westminster (Los Angeles), CA 78,375 43,464 84,709 (180 ) 42,567 43,284 127,276 170,560 68,807 1998 WestShore Plaza Tampa, FL — 53,904 120,191 — 4,755 53,904 124,946 178,850 17,752 2015 Open Air Properties Bloomingdale Court Bloomingdale (Chicago), IL — 8,422 26,184 (395 ) 19,017 8,027 45,201 53,228 29,851 1987 Bowie Town Center Strip Bowie (Wash, D.C.), MD — 231 4,597 — 819 231 5,416 5,647 2,741 2001 Canyon View Marketplace Grand Junction, CO 5,215 1,370 9,570 — 120 1,370 9,690 11,060 1,057 2015 Charles Towne Square Charleston, SC — — 1,768 370 10,890 370 12,658 13,028 12,209 1976 Chesapeake Center Chesapeake (Virginia Beach), VA — 4,410 11,241 — 1,504 4,410 12,745 17,155 10,203 1996 Concord Mills Marketplace Concord (Charlotte), NC 16,000 8,036 21,167 — 956 8,036 22,123 30,159 5,795 2007 Countryside Plaza Countryside (Chicago), IL — 332 8,507 2,554 12,039 2,886 20,546 23,432 13,269 1977 Dare Centre Kill Devil Hills, NC — — 5,702 — 2,405 — 8,107 8,107 4,221 2004 DeKalb Plaza King of Prussia (Philadelphia), PA — 1,955 3,405 — 1,394 1,955 4,799 6,754 2,818 2003 Empire East Sioux Falls, SD — 3,350 10,552 — 2,799 3,350 13,351 16,701 3,698 1998 Fairfax Court Fairfax (Wash, D.C.), VA — 8,078 34,997 — 1,470 8,078 36,467 44,545 6,309 2014 Initial Cost Cost Capitalized Gross Amounts At Name Location Encumbrances(3) Land Buildings and Land Buildings and Land Buildings and Total(1) Accumulated Date of Fairfield Town Center Houston, TX — 4,745 5,044 168 38,799 4,913 43,843 48,756 3,889 2014 Forest Plaza Rockford, IL 15,588 4,132 16,818 453 12,499 4,585 29,317 33,902 17,845 1985 Gaitway Plaza Ocala, FL — 5,445 26,687 — 2,293 5,445 28,980 34,425 5,994 2014 Greenwood Plus Greenwood (Indianapolis), IN — 1,129 1,792 (58 ) 4,905 1,071 6,697 7,768 4,647 1979 Henderson Square King of Prussia (Philadelphia), PA — 4,223 15,124 — 1,080 4,223 16,204 20,427 7,228 2003 Keystone Shoppes Indianapolis, IN — — 4,232 2,118 5,356 2,118 9,588 11,706 4,218 1997 Lake Plaza Waukegan (Chicago), IL — 2,487 6,420 — 2,515 2,487 8,935 11,422 5,830 1986 Lake View Plaza Orland Park (Chicago), IL — 4,702 17,543 (89 ) 18,646 4,613 36,189 40,802 23,456 1986 Lakeline Plaza Cedar Park (Austin), TX 14,604 5,822 30,875 — 14,815 5,822 45,690 51,512 25,086 1998 Lima Center Lima, OH — 1,781 5,151 — 10,056 1,781 15,207 16,988 10,259 1996 Lincoln Crossing O'Fallon (St. Louis), IL — 674 2,192 — 9,543 674 11,735 12,409 3,597 1990 MacGregor Village Cary, NC — 502 8,891 — 3,053 502 11,944 12,446 4,527 2004 Mall of Georgia Crossing Buford (Atlanta), GA 22,208 9,506 32,892 — 3,011 9,506 35,903 45,409 20,776 1999 Markland Plaza Kokomo, IN — 206 738 — 8,300 206 9,038 9,244 4,919 1974 Martinsville Plaza Martinsville, VA — — 584 — 3,003 — 3,587 3,587 359 1967 Matteson Plaza Matteson (Chicago), IL — 1,771 9,737 — 47 1,771 9,784 11,555 9,655 1988 Muncie Towne Plaza Muncie, IN 6,071 267 10,509 87 3,660 354 14,169 14,523 8,422 1998 North Ridge Shopping Center Raleigh, NC 11,764 385 12,826 — 7,522 385 20,348 20,733 7,077 2004 Northwood Plaza Fort Wayne, IN — 148 1,414 — 3,481 148 4,895 5,043 3,140 1974 Plaza at Buckland Hills, The Manchester, CT — 17,355 43,900 (281 ) 4,394 17,074 48,294 65,368 7,049 2014 Richardson Square Richardson (Dallas), TX — 6,285 — 990 14,818 7,275 14,818 22,093 6,108 1996 Rockaway Commons Rockaway (New York), NJ — 5,149 26,435 — 16,447 5,149 42,882 48,031 20,038 1998 Rockaway Town Plaza Rockaway (New York), NJ — — 18,698 2,227 5,187 2,227 23,885 26,112 9,993 2004 Royal Eagle Plaza Coral Springs (Miami), FL — 2,153 24,216 — 3,253 2,153 27,469 29,622 6,509 2014 Shops at North East Mall, The Hurst (Dallas), TX — 12,541 28,177 402 7,592 12,943 35,769 48,712 24,629 1999 St. Charles Towne Plaza Waldorf (Wash, D.C.), MD — 8,216 18,993 — 10,242 8,216 29,235 37,451 17,860 1987 Tippecanoe Plaza Lafayette, IN — — 745 234 5,821 234 6,566 6,800 4,216 1974 University Center Mishawaka, IN — 2,119 8,365 — 5,190 2,119 13,555 15,674 10,703 1996 University Town Plaza Pensacola, FL — 6,009 26,945 (579 ) 381 5,430 27,326 32,756 8,739 2013 Village Park Plaza Carmel (Indianapolis), IN — 19,565 51,873 — 1,065 19,565 52,938 72,503 13,319 2014 Washington Plaza Indianapolis, IN — 263 1,833 — 3,049 263 4,882 5,145 4,224 1996 West Ridge Plaza Topeka, KS 9,986 1,376 4,560 1,958 8,498 3,334 13,058 16,392 6,799 1988 West Town Corners Altamonte Springs (Orlando), FL — 6,821 24,603 (174 ) 6,901 6,647 31,504 38,151 6,150 2014 Westland Park Plaza Orange Park (Jacksonville), FL — 5,576 8,775 — 4 5,576 8,779 14,355 2,016 2014 White Oaks Plaza Springfield, IL 12,143 3,169 14,267 292 11,204 3,461 25,471 28,932 14,004 1986 Initial Cost Cost Capitalized Gross Amounts At Name Location Encumbrances(3) Land Buildings and Land Buildings and Land Buildings and Total(1) Accumulated Date of Whitehall Mall Whitehall, PA — 8,500 28,512 — 4,680 8,500 33,192 41,692 7,860 2014 Wolf Ranch Georgetown (Austin), TX — 21,999 51,547 (185 ) 13,815 21,814 65,362 87,176 31,398 2005 Developments In Progress — Cottonwood Mall Albuquerque, NM — — — — — 826 1,525 2,351 — Dayton Mall Dayton, OH — — — — — — 1,828 1,828 — Fairfield Town Center Houston, TX — — — — — 3,203 779 3,982 — Grand Central Mall Parkersburg, WV — — — — — — 1,362 1,362 — Great Lakes Mall Mentor (Cleveland), OH — — — — — — 6,243 6,243 — MacGregor Village Cary, NC — — — — — — 1,790 1,790 — Northwoods Mall Peoria, IL — — — — — 117 2,595 2,712 — Southern Park Mall Youngstown, OH — — — — — — 1,293 1,293 — WestShore Plaza Tampa, FL — — — — — — 6,700 6,700 — Other Developments — — — — — 1,200 12,307 13,507 — $ 980,276 $ 782,921 $ 3,607,440 $ 47,947 $ 1,337,077 $ 836,214 $ 4,980,939 $ 5,817,153 $ 2,212,476 (1) Reconciliation of Real Estate Properties: The changes in real estate assets (which excludes furniture, fixtures and equipment) for the years ended December 31, 2018, 2017 and 2016 are as follows: 2018 2017 2016 Balance, beginning of year $ 5,715,996 $ 6,205,387 $ 6,699,789 Acquisitions 72,647 14,366 297 Improvements 143,123 135,713 157,561 Held for sale reclasses — — (215,244 ) Disposals* (114,613 ) (639,470 ) (437,016 ) Balance, end of year $ 5,817,153 $ 5,715,996 $ 6,205,387 *Primarily represents properties that have been deconsolidated upon sale of controlling interest, sold properties and fully depreciated assets which have been disposed. Further, includes impairment charges of $0 , $66,925 , and $21,879 for the years ended December 31, 2018, 2017 and 2016 , respectively. The following reconciles investment properties at cost per the consolidated balance sheet to the balance per Schedule III as of December 31, 2018 : 2018 Investment properties at cost $ 5,914,705 Less: furniture, fixtures and equipment (97,552 ) Total cost per Schedule III $ 5,817,153 The unaudited aggregate cost for federal income tax purposes of real estate assets presented was $5,334,779 as of December 31, 2018 . (2) Reconciliation of Accumulated Depreciation: The changes in accumulated depreciation and amortization for the years ended December 31, 2018, 2017 and 2016 are as follows: 2018 2017 2016 Balance, beginning of year $ 2,076,948 $ 2,063,107 $ 2,261,593 Depreciation expense 205,724 205,078 222,861 Disposals (70,196 ) (191,237 ) (421,347 ) Balance, end of year $ 2,212,476 $ 2,076,948 $ 2,063,107 The following reconciles accumulated depreciation per the consolidated balance sheet to the balance per Schedule III as of December 31, 2018 : 2018 Accumulated depreciation $ 2,283,764 Less: furniture, fixtures and equipment (71,288 ) Total accumulated depreciation per Schedule III $ 2,212,476 Depreciation of our investment in buildings and improvements reflected in the consolidated statements of operations is generally calculated over the estimated original lives of the assets as noted below: • Buildings and Improvements—typically 10 - 40 years for the structure, 15 years for landscaping and parking lot, and 10 years for HVAC equipment. • Tenant Allowances and Improvements—shorter of lease term or useful life. (3) Encumbrances represent face amount of mortgage debt and exclude any fair value adjustments and debt issuance costs.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments purchased with an original maturity of 90 days or less to be cash and cash equivalents. Cash equivalents are carried at cost, which approximates fair value. Cash equivalents generally consist of commercial paper, bankers' acceptances, repurchase agreements, and money market deposits or securities. Financial instruments that potentially subject us to concentrations of credit risk include our cash and cash equivalents and our tenant receivables. We place our cash and cash equivalents with institutions with high credit quality. However, at certain times, such cash and cash equivalents may be in excess of FDIC and SIPC insurance limits.
Investment Properties	Investment Properties We record investment properties at fair value when acquired. Investment properties include costs of acquisitions; development, predevelopment, and construction (including allocable salaries and related benefits); tenant allowances and improvements; and interest and real estate taxes incurred during construction. We capitalize improvements and replacements from repair and maintenance when the repair and maintenance extends the useful life, increases capacity, or improves the efficiency of the asset. All other repair and maintenance items are expensed as incurred. We capitalize interest on projects during periods of construction until the projects are ready for their intended purpose based on interest rates in place during the construction period. Capitalized interest for the years ended December 31, 2018, 2017 and 2016 was $2,234 , $1,521 and $2,640 , respectively. We record depreciation on buildings and improvements utilizing the straight-line method over an estimated original useful life, which is generally five to 40 years. We review depreciable lives of investment properties periodically and we make adjustments when necessary to reflect a shorter economic life. We amortize tenant allowances and tenant improvements utilizing the straight-line method over the term of the related lease or occupancy term of the tenant, if shorter. We record depreciation on equipment and fixtures utilizing the straight-line method over three to ten years. We review investment properties for impairment on a property-by-property basis whenever events or changes in circumstances indicate that the carrying value of investment properties may not be recoverable. These circumstances include, but are not limited to, declines in a property's cash flows, ending occupancy, estimated market values or our decision to dispose of a property before the end of its estimated useful life. Furthermore, this evaluation is conducted no less frequently than quarterly, irrespective of changes in circumstances. We measure any impairment of investment property when the estimated undiscounted operating income before depreciation and amortization plus its residual value is less than the carrying value of the property. To the extent impairment has occurred, we charge to expense the excess of carrying value of the property over its estimated fair value. We estimate fair value using unobservable data such as operating income, estimated capitalization rates, leasing prospects and local market information. We may decide to dispose properties that are held for use and the consideration received from these property dispositions may differ from their carrying values. We also review our investments, including investments in unconsolidated entities, if events or circumstances change indicating that the carrying amount of our investments may not be recoverable. We will record an impairment charge if we determine that a decline in the fair value of the investments in unconsolidated entities is other-than-temporary. Changes in economic and operating conditions that occur subsequent to our review of recoverability of investment property and other investments in unconsolidated entities could impact the assumptions used in that assessment and could result in future charges to earnings if assumptions regarding those investments differ from actual results.
Investments in Unconsolidated Entities	Investments in Unconsolidated Entities Joint ventures are common in the real estate industry. We use joint ventures to finance properties, develop new properties, and diversify our risk in a particular property or portfolio of properties. We held material unconsolidated joint venture ownership interests in 13 properties as of December 31, 2018 and 2017 (see Note 5 - "Investment in Unconsolidated Entities, at Equity"). Certain of our joint venture properties are subject to various rights of first refusal, buy-sell provisions, put and call rights, or other sale or marketing rights for partners which are customary in real estate joint venture agreements and the industry. We and our partners in these joint ventures may initiate these provisions (subject to any applicable lock up or similar restrictions), which may result in either the sale of our interest or the use of available cash or borrowings to acquire the joint venture interest from our partner.
Fair Value Measurements	Fair Value Measurements The Company measures and discloses its fair value measurements in accordance with Accounting Standards Codification ("ASC") Topic 820 - “Fair Value Measurement” (“Topic 820”). Topic 820 guidance emphasizes that fair value is a market-based measurement, not an entity-specific measurement. Therefore, a fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, Topic 820 establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The fair value hierarchy, as defined by Topic 820, contains three levels of inputs that may be used to measure fair value as follows: • Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. • Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly such as interest rates, foreign exchange rates, and yield curves, that are observable at commonly quoted intervals. • Level 3 inputs are unobservable inputs for the asset or liability which are typically based on an entity's own assumptions, as there is little, if any, related market activity. 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. Note 6 - "Indebtedness" includes a discussion of the fair value of debt measured using Level 1 and Level 2 inputs. Note 4 - "Investment in Real Estate" includes a discussion of the fair value inputs used in our impairment analyses, using Level 3 inputs, primarily. Level 3 inputs include our estimations of net operating results of the property, capitalization rates and discount rates. The Company has derivatives that must be measured under the fair value standard (see Note 7 - "Derivative Financial Instruments"). The Company currently does not have any non-financial assets and non-financial liabilities that are required to be measured at fair value on a recurring basis.
Purchase Accounting Valuation	Purchase Accounting Valuation We record the total consideration of acquisitions, including transaction costs as permitted under Accounting Standards Update ("ASU ") 2017-1, "Business Combinations (Topic 805): Clarifying the Definition of a Business," and any excess investment in unconsolidated entities to the various components of the acquisition based upon the fair value of each component which may be derived from various Level 2 and Level 3 inputs. Level 3 inputs include our estimations of net operating results of the property, capitalization rates and discount rates. Also, we may utilize third party valuation specialists. These components typically include buildings, land and intangibles related to in-place leases and we estimate: • the fair value of land and related improvements and buildings on an as-if-vacant basis; • the market value of in-place leases based upon our best estimate of current market rents and amortize the resulting market rent adjustment into revenues; • the value of costs to obtain tenants, including tenant allowances and improvements and leasing commissions; and • the value of revenue and recovery of costs foregone during a reasonable lease-up period, as if the space was vacant. The fair value of buildings is depreciated over the estimated remaining life of the acquired buildings or related improvements. We amortize tenant improvements, in-place lease assets and other lease-related intangibles over the remaining life of the underlying leases. We also estimate the value of other acquired intangible assets, if any, which are amortized over the remaining life of the underlying related intangibles.
Use of Estimates	Use of Estimates We prepared the accompanying consolidated financial statements in accordance with GAAP. This requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and revenues and expenses during the reported period. Our actual results could differ from these estimates.
Segment Disclosure	Segment Disclosure Our primary business is the ownership, development and management of retail real estate. We have aggregated our operations, including enclosed retail properties and open air properties, into one reportable segment because they have similar economic characteristics and we provide similar products and services to similar types of, and in many cases, the same tenants.
New Accounting Pronouncements	New Accounting Pronouncements Adoption of New Standards On January 1, 2018, we adopted Accounting Standards Update ("ASU") 2014-09, "Revenue from Contracts with Customers (Topic 606)" using the modified retrospective approach. ASU 2014-09 revised GAAP by offering a single comprehensive revenue recognition standard instead of numerous revenue requirements for particular industries or transactions, which sometimes resulted in different accounting for economically similar transactions. The impacted revenue streams primarily consist of fees earned from management, development and leasing services provided to joint ventures in which we own an interest and other ancillary income earned from our properties. Upon adoption, we recorded a cumulative-effect adjustment to increase equity of approximately $2.5 million related to changes in the revenue recognition pattern of lease commissions earned by the Company from our joint ventures. We do not expect the adoption of ASU 2014-09 to have a material impact to our net income on an ongoing basis. Additionally, we adopted the clarified scope guidance of ASC 610-20, "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" in conjunction with ASU 2014-09, using the modified retrospective approach. ASC 610-20 applies to the sale, transfer and derecognition of nonfinancial assets and in substance nonfinancial assets to noncustomers, including partial sales, and eliminates the guidance specific to real estate in ASC 360-20. With respect to full disposals, the recognition will generally be consistent with our current measurement and pattern of recognition. With respect to partial sales of real estate to joint ventures, the new guidance requires us to recognize a full gain where an equity investment is retained. These transactions could result in a basis difference as we will be required to measure our retained equity interest at fair value, whereas the joint venture may continue to measure the assets received at carryover basis. No adjustments were required upon adoption of this standard. On January 1, 2018, we adopted ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." ASU 2017-12 aims to reduce complexity in cash value hedges of interest rate risk and eliminates the requirement to separately measure and report hedge ineffectiveness, generally requiring the entire change in the fair value of the hedging instrument to be presented in the same income statement line as the hedged item. Upon adoption, we recorded a cumulative-effect adjustment of $0.6 million between accumulated other comprehensive income and retained earnings. The cumulative effect of the changes to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09 and ASU 2017-12 were as follows: Balance at December 31, 2017 Adjustments Due to Adjustments Due to Balance at January 1, 2018 Balance Sheet Liabilities Accounts payable, accrued expenses, intangibles, and deferred revenues $ 264,998 $ (2,474 ) $ — $ 262,524 Equity Capital in excess of par value $ 1,240,483 $ (389 ) $ — $ 1,240,094 Accumulated deficit $ (350,594 ) $ 2,474 $ (584 ) $ (348,704 ) Accumulated other comprehensive income $ 6,920 $ — $ 584 $ 7,504 Noncontrolling interests $ 167,718 $ 389 $ — $ 168,107 In accordance with ASU 2014-09 requirements, the disclosure of the impact of adoption on our consolidated statements of operations for the year ended December 31, 2018 and consolidated balance sheet as of December 31, 2018 were as follows: For the Year Ended December 31, 2018 As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Higher/(Lower) Consolidated Statements of Operations Revenues Other income $ 30,504 $ 29,954 $ 550 December 31, 2018 As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Higher/(Lower) Balance Sheet Liabilities Accounts payable, accrued expenses, intangibles, and deferred revenues $ 253,862 $ 256,886 $ (3,024 ) Equity Capital in excess of par value $ 1,247,639 $ 1,248,111 $ (472 ) Accumulated deficit $ (456,924 ) $ (459,948 ) $ 3,024 Noncontrolling interests $ 148,561 $ 148,089 $ 472 On January 1, 2018, we adopted ASU 2016-15, "Statement of Cash Flows (Topic 230)" and ASU 2016-18 "Restricted Cash" using a retrospective transition approach, which changed our statements of cash flows and related disclosures for all periods presented. ASU 2016-15 is intended to reduce diversity in practice with respect to how certain transactions are classified in the statement of cash flows and its adoption had no impact on our financial statements. ASU 2016-18 requires that a statement of cash flows explain the change during the period in total of cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. The following is a summary of our cash, cash equivalents and restricted cash total as presented in our statements of cash flows for the years ended December 31, 2018, 2017 and 2016 : For the Year Ended December 31, 2018 2017 2016 Cash and cash equivalents $ 42,542 $ 52,019 $ 59,353 Restricted cash 18,542 18,182 29,160 Total cash, cash equivalents and restricted cash $ 61,084 $ 70,201 $ 88,513 For the year ended December 31, 2017, restricted cash related to cash flows provided by operating activities of $2.9 million , restricted cash related to cash flows used in investing activities of $6.4 million , and restricted cash related to cash flows used in financing activities of $1.7 million were reclassified. For the year ended December 31, 2016, restricted cash related to cash flows provided by operating activities of $0.8 million , restricted cash related to cash flows used in investing activities of $1.5 million , and restricted cash related to cash flows used in financing activities of $10.4 million were reclassified. Restricted cash primarily relates to cash held in escrow for payment of real estate taxes and property reserves for maintenance, expansion or leasehold improvements as required by our mortgage loans. Restricted cash is included in "Deferred costs and other assets" in the accompanying balance sheets as of December 31, 2018 and December 31, 2017. New Standards Issued But Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. It is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The new leases standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. In July 2018, the FASB approved an amendment that provides an entity the optional transition method to initially account for the impact of the adoption ASU 2016-02 with a cumulative adjustment to retained earnings on January 1, 2019 (the effective date of the ASU), rather than January 1, 2017, which would eliminate the need to restate amounts presented prior to January 1, 2019. We will utilize this optional transition method. From a lessee perspective, the Company currently has four material ground leases, two material office leases, and one material garage lease that, under the new guidance, will result in the recognition of a lease liability and corresponding right-of-use asset. As of December 31, 2018 , undiscounted future minimum lease payments due under these leases total approximately $31.1 million with termination dates which range from 2023 to 2076 and we expect the recognized lease liability and corresponding right-of-use asset to not exceed $20.0 million upon adoption. From a lessor perspective, the new guidance remains mostly similar to current rules, though contract consideration will now be allocated between lease and non-lease components. Non-lease component allocations will be recognized under ASU 2014-09, and we expect that this will result in a different pattern of recognition for certain non-lease components, including for fixed common-area ("CAM") revenues. However, the FASB's amendment to ASU 2016-02 referred to above allows lessors to elect, as a practical expedient, not to allocate the total consideration to lease and non-lease components based on their relative standalone selling prices. This practical expedient allows lessors to elect a combined single lease component presentation if (i) the timing and pattern of the revenue recognition of the combined single lease component is the same, and (ii) the combined single component would be classified as an operating lease. We believe we meet the criteria to use this practical expedient and we plan to elect this practical expedient upon the effective date. In addition, ASU 2016-02 limits the capitalization of leasing costs to initial direct costs, which will likely result in a reduction to our capitalized leasing costs and an increase to general and administrative expenses, though the amount of such changes is highly dependent upon the leasing compensation structures in place at the time of adoption. For the years ended December 31, 2018 and 2017 , the Company deferred $17.7 million and $16.9 million of internal leasing costs, respectively.
Deferred Lease Costs and Corporate Improvements	Deferred Leasing Costs and Corporate Improvements Our deferred leasing costs consist of salaries and related benefits, including fees charged by SPG in conjunction with the 2014 spin-off (see Note 11- "Related Party Transactions" for further details), for salaries and related benefits incurred in connection with lease originations, and fees paid to third party brokers. We record amortization of deferred leasing costs on a straight-line basis over the terms of the related leases.
Revenue Recognition	Minimum Rent Minimum rent is recognized on a straight-line basis over the terms of their respective leases. Minimum rent also includes accretion related to above-market and below-market lease intangibles related to the acquisition of operating properties. We amortize any tenant inducements as a reduction of revenue utilizing the straight-line method over the term of the related lease or occupancy term of the tenant, if shorter. Overage Rent A large number of our retail tenants are also required to pay overage rents based on sales over a stated base amount during the lease year. We recognize overage rents only when each tenant's sales exceed the applicable sales threshold as defined in their lease. Tenant Reimbursements A substantial portion of our leases require the tenant to reimburse us for a material portion of our property operating expenses, including CAM, real estate taxes and insurance. Such property operating expenses typically include utility, insurance, security, janitorial, landscaping, food court and other administrative expenses. Tenant reimbursements are established in the leases or computed based upon a formula related to real estate taxes, insurance and other property operating expenses and are recognized as revenues in the period they are earned. When not reimbursed by the fixed CAM component, CAM expense reimbursements are based on the tenant's proportionate share of the allocable operating expenses and CAM capital expenditures for the property. We accrue reimbursements from tenants for recoverable portions of all these expenses as revenue in the period the applicable expenditures are incurred. We recognize differences between estimated recoveries and the final billed amounts in the subsequent year. Other Income Lease related: We collect lease termination income from tenants to allow for the tenant to vacate their space prior to their scheduled lease termination date. We recognize lease termination income in the period when a termination agreement is signed, collectability is assured, and we are no longer obligated to provide space to the tenant. In the event that a tenant is in bankruptcy when the termination agreement is signed, termination fee income is deferred and recognized when, and if, it is received. Ancillary: We seek to monetize our common areas through robust ancillary programs. These programs include destination holiday experiences, customer service programs, sponsored children's play areas and local events, and static and digital media initiatives. We enter into agreements with unrelated third parties under these programs and charge a negotiated fee in exchange for providing the unrelated third party access to the common area as defined under the respective agreements. We recognize the fee as revenue as we satisfy our performance obligations, which typically occurs over one year. Fee related: We collect fee income primarily from our unconsolidated joint ventures in exchange for providing management, leasing, and development services. Management fees are charged as a percentage of revenues (as defined in the applicable management agreements) and are recognized as revenue as we render such services. Leasing fees are charged on a fixed amount per square foot signed or a percentage of net rent negotiated within the underlying lease and are recognized upon lease execution. Development fees are charged on a contractual percentage of hard costs to develop the respective asset and are recognized as we satisfy our obligation to provide the development services. Allowance for Credit Losses We record a provision for credit losses based on our judgment of a tenant's creditworthiness, ability to pay and probability of collection. In addition, we also consider the retail sector in which the tenant operates and our historical collection experience in cases of bankruptcy, if applicable. Accounts are written off when they are deemed to be no longer collectible.
Income and Other Taxes	Income and Other Taxes WPG Inc. has elected to be taxed as a REIT under Sections 856 through 860 of the Code and applicable Treasury regulations relating to REIT qualification. In order to maintain REIT status, the regulations require the entity to distribute at least 90% of taxable income, exclusive of net capital gains, to its owners and meet certain other asset and income tests as well as other requirements. WPG Inc. intends to continue to adhere to these requirements and maintain its REIT status and that of its REIT subsidiaries. As a REIT, WPG Inc. will generally not be liable for federal corporate income taxes as long as it continues to distribute at least of 100% of its taxable income. Thus, we made no provision for federal income taxes on WPG Inc. in the accompanying consolidated financial statements. If WPG Inc. fails to qualify as a REIT, it will be subject to tax at regular corporate rates for the years in which it failed to qualify. If WPG Inc. loses its REIT status it could not elect to be taxed as a REIT for four years unless its failure to qualify was due to reasonable cause and certain other conditions were satisfied. We have also elected taxable REIT subsidiary ("TRS") status for some of WPG Inc.'s subsidiaries. This enables us to provide services that would otherwise be considered impermissible for REITs and participate in activities that do not qualify as "rents from real property." For the years ended December 31, 2018, 2017 and 2016 , we recorded federal income tax provisions (benefits) of $525 , $(87) , and $227 , respectively, related to the taxable income generated by the TRS entities, which is included in income and other taxes in the accompanying consolidated statements of operations and comprehensive income. For these entities, deferred tax assets and liabilities are established for temporary differences between the financial reporting basis and the tax basis of assets and liabilities at the enacted tax rates to be in effect when the temporary differences reverse. There were no deferred tax assets or liabilities for the years ended December 31, 2018 and 2017 as a result of federal and state net operating loss carryovers. A valuation allowance for deferred tax assets is provided if we believe all or some portion of the deferred tax asset may not be realized. An increase or decrease in the valuation allowance that results from the change in circumstances that causes a change in our judgment about the realizability of the related deferred tax asset is included in income. There were no valuation allowances as of December 31, 2018 and 2017, respectively, as the TRS did not have any net operating loss carryovers. As of December 31, 2018 and 2017 , the TRS had no net deferred tax assets related to net operating loss carryovers. We are also subject to certain other taxes, including state and local taxes and franchise taxes, which are included in income and other taxes in the accompanying consolidated statements of operations and comprehensive income. For federal income tax purposes, the cash distributions paid to WPG Inc.'s common and preferred shareholders may be characterized as ordinary income, return of capital (generally non-taxable) or capital gains. Tax law permits certain characterization of distributions which could result in differences between cash basis and tax basis distribution amounts.
Noncontrolling Interests for WPG Inc. and Redeemable Noncontrolling Interests for WPG Inc.	Redeemable Noncontrolling Interests for WPG Inc. During the year ended December 31, 2017, but prior to the completion of the O'Connor Joint Venture II transaction (see Note 5 - "Investment in Unconsolidated Entities, at Equity" for further details), the Company purchased all of the redeemable noncontrolling interest equity owned by the unaffiliated third parties in consolidated joint venture entities that owned Arbor Hills, located in Ann Arbor, Michigan and Classen Curve and The Triangle at Classen Curve, each located in Oklahoma City, Oklahoma and Nichols Hills Plaza, located in Nichols Hills, Oklahoma (the "Oklahoma City Properties," collectively). At December 31, 2018 and 2017 , redeemable noncontrolling interests represented the outstanding 130,592 units of WPG L.P. 7.3% Series I-1 Preferred Units (the "Series I-1 Preferred Units"). Dividends accrue quarterly at an annual rate of 7.3% per share. The unaffiliated third parties have, at their option, the right to have their equity purchased by the Company subject to the satisfaction of certain conditions.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The cumulative effect of the changes to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09 and ASU 2017-12 were as follows: Balance at December 31, 2017 Adjustments Due to Adjustments Due to Balance at January 1, 2018 Balance Sheet Liabilities Accounts payable, accrued expenses, intangibles, and deferred revenues $ 264,998 $ (2,474 ) $ — $ 262,524 Equity Capital in excess of par value $ 1,240,483 $ (389 ) $ — $ 1,240,094 Accumulated deficit $ (350,594 ) $ 2,474 $ (584 ) $ (348,704 ) Accumulated other comprehensive income $ 6,920 $ — $ 584 $ 7,504 Noncontrolling interests $ 167,718 $ 389 $ — $ 168,107 In accordance with ASU 2014-09 requirements, the disclosure of the impact of adoption on our consolidated statements of operations for the year ended December 31, 2018 and consolidated balance sheet as of December 31, 2018 were as follows: For the Year Ended December 31, 2018 As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Higher/(Lower) Consolidated Statements of Operations Revenues Other income $ 30,504 $ 29,954 $ 550 December 31, 2018 As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Higher/(Lower) Balance Sheet Liabilities Accounts payable, accrued expenses, intangibles, and deferred revenues $ 253,862 $ 256,886 $ (3,024 ) Equity Capital in excess of par value $ 1,247,639 $ 1,248,111 $ (472 ) Accumulated deficit $ (456,924 ) $ (459,948 ) $ 3,024 Noncontrolling interests $ 148,561 $ 148,089 $ 472
Schedule of Cash and Cash Equivalents	The following is a summary of our cash, cash equivalents and restricted cash total as presented in our statements of cash flows for the years ended December 31, 2018, 2017 and 2016 : For the Year Ended December 31, 2018 2017 2016 Cash and cash equivalents $ 42,542 $ 52,019 $ 59,353 Restricted cash 18,542 18,182 29,160 Total cash, cash equivalents and restricted cash $ 61,084 $ 70,201 $ 88,513
Schedule of Deferred Costs and Other Assets	Deferred costs and other assets include the following as of December 31, 2018 and 2017 : 2018 2017 Deferred leasing costs and corporate improvements, net $ 74,260 $ 79,079 In-place lease intangibles, net 38,453 46,627 Acquired above market lease intangibles, net 18,827 24,254 Mortgage and other escrow deposits 18,542 18,182 Prepaids, notes receivable and other assets, net 19,053 20,953 $ 169,135 $ 189,095
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	Details of deferred leasing costs and corporate improvements as of December 31, 2018 and 2017 are as follows: 2018 2017 Deferred leasing costs $ 142,903 $ 143,667 Corporate improvements 6,072 5,324 Accumulated amortization (74,715 ) (69,912 ) Deferred lease costs and corporate improvements, net $ 74,260 $ 79,079
Disaggregation of Revenue	The following tables disaggregate our revenue by major source for the years ended December 31, 2018, 2017 and 2016 : For the Year Ended December 31, 2018 Minimum rent Overage rent Tenant reimbursements Other income Total Lease related $ 492,169 $ 9,313 $ 191,319 $ 3,457 $ 696,258 Ancillary — — — 10,275 10,275 Fee related — — — 9,527 9,527 Other (1) — — — 7,245 7,245 Total revenues $ 492,169 $ 9,313 $ 191,319 $ 30,504 $ 723,305 (1) Primarily relates to insurance proceeds received from property insurance claims and excess franchise tax refunds for a previously-owned property. For the Year Ended December 31, 2017 Minimum rent Overage rent Tenant reimbursements Other income Total Lease related $ 516,386 $ 9,115 $ 208,290 $ 3,492 $ 737,283 Ancillary — — — 9,848 9,848 Fee related — — — 7,906 7,906 Other — — — 3,085 3,085 Total revenues $ 516,386 $ 9,115 $ 208,290 $ 24,331 $ 758,122 For the Year Ended December 31, 2016 Minimum rent Overage rent Tenant reimbursements Other income Total Lease related $ 572,781 $ 12,882 $ 236,510 $ 1,310 $ 823,483 Ancillary — — — 10,111 10,111 Fee related — — — 6,709 6,709 Other — — — 3,172 3,172 Total revenues $ 572,781 $ 12,882 $ 236,510 $ 21,302 $ 843,475
Allowance for Credit Losses on Financing Receivables	The activity in the allowance for credit losses, which are included in "Tenant receivables and accrued revenue, net" in the accompanying balance sheets, during the years ended December 31, 2018, 2017 and 2016 is as follows: For the Year Ended December 31, 2018 2017 2016 Balance, beginning of year $ 7,867 $ 8,578 $ 4,222 Provision for credit losses 5,826 5,068 4,508 Accounts deconsolidated upon joint venture formation (see Note 5) — (1,271 ) — Accounts written off, net of recoveries, and other (3,562 ) (4,508 ) (152 ) Balance, end of year $ 10,131 $ 7,867 $ 8,578
Distributions Paid On a Tax Basis	The following characterizes distributions paid per common and preferred share on a tax basis for the years ended December 31, 2018, 2017 and 2016 : 2018 2017 2016 $ % $ % $ % Common shares Ordinary income $ 1.0000 100.00 % $ 0.4306 43.06 % $ 0.6128 61.28 % Capital gain — — 0.5694 56.94 % — — Non-dividend distributions — — — — 0.3872 38.72 % $ 1.0000 100.00 % $ 1.0000 100.00 % $ 1.0000 100.00 % Series H Preferred Shares Ordinary income $ 1.8752 100.00 % $ 1.0093 43.06 % $ 1.4064 100.00 % Capital gain — — 1.3347 56.94 % — — $ 1.8752 100.00 % $ 2.3440 100.00 % $ 1.4064 100.00 % Series I Preferred Shares Ordinary income $ 1.7188 100.00 % $ 0.9251 43.06 % $ 1.2891 100.00 % Capital gain — — 1.2234 56.94 % — — $ 1.7188 100.00 % $ 2.1485 100.00 % $ 1.2891 100.00 %
Movement in Minority Interest Roll Forward	Details of the carrying amount of WPG Inc.'s noncontrolling interests are as follows as of December 31, 2018 and 2017 : 2018 2017 Limited partners' interests in WPG L.P. $ 147,493 $ 166,660 Noncontrolling interests in properties 1,068 1,058 Total noncontrolling interests $ 148,561 $ 167,718

Investment in Real Estate (Tabl

Investment in Real Estate (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of Real Estate Properties	Investment properties consisted of the following as of December 31, 2018 and 2017 : 2018 2017 Land $ 836,214 $ 807,202 Buildings and improvements 4,980,939 4,908,794 Total land, buildings and improvements 5,817,153 5,715,996 Furniture, fixtures and equipment 97,552 91,764 Investment properties at cost 5,914,705 5,807,760 Less: accumulated depreciation 2,283,764 2,139,620 Investment properties at cost, net $ 3,630,941 $ 3,668,140 ​ ​ ​ Construction in progress included above $ 35,068 $ 46,046
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the fair value allocation for the acquisitions, which was finalized during the three months ended June 30, 2018: Investment properties $ 72,647 Investment in and advances to unconsolidated entities, at equity 5,543 Deferred costs and other assets 10,311 Accounts payable, accrued expenses, intangibles, and deferred revenue (8,393 ) Net cash paid for acquisitions $ 80,108
Schedule of Dispositions	The following table summarizes the key terms of each tranche: Tranche Sales Date Parcels Sold Purchase Price Sales Proceeds Tranche 1 January 12, 2018 10 $ 13,692 $ 13,506 Tranche 2 June 29, 2018 5 9,503 9,423 Tranche 3 July 27, 2018 2 4,607 4,530 Tranche 4 October 31, 2018 2 1,718 1,714 Tranche 5 November 16, 2018 1 3,195 3,166 20 $ 32,715 $ 32,339
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	The following table denotes the gross carrying values of the respective intangibles as of December 31, 2018 and 2017 : Balance as of Intangible Asset/Liability December 31, 2018 December 31, 2017 Above-market leases - Company is lessor $ 48,373 $ 51,315 Below-market leases - Company is lessor $ 117,395 $ 124,475 In-place leases $ 109,379 $ 120,159 The table below identifies the types of intangible assets and liabilities, their location on the consolidated balance sheets, their weighted average amortization period, and their book value, which is net of accumulated amortization, as of December 31, 2018 and 2017 : Balance as of Intangible Location on the Weighted Average Remaining Amortization (in years) December 31, 2018 December 31, 2017 Above-market leases - Company is lessor Deferred costs and other assets 6.9 $ 18,827 $ 24,254 Below-market leases - Company is lessor Accounts payable, accrued expenses, intangibles and deferred revenues 12.6 $ 66,651 $ 77,870 In-place leases Deferred costs and other assets 11.1 $ 38,453 $ 46,627
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The future net amortization of intangibles as an increase (decrease) to net income as of December 31, 2018 is as follows: Above/Below-Market Leases-Lessor In-place Leases Total Net Intangible Amortization 2019 $ 4,339 $ (9,203 ) $ (4,864 ) 2020 4,606 (6,965 ) (2,359 ) 2021 4,677 (3,584 ) 1,093 2022 4,187 (2,819 ) 1,368 2023 3,619 (2,285 ) 1,334 Thereafter 26,396 (13,597 ) 12,799 $ 47,824 $ (38,453 ) $ 9,371

Investment In Unconsolidated _2

Investment In Unconsolidated Entities, at Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	For the Year Ended December 31, 2018 2017 2016 Total revenues $ 264,521 $ 236,415 $ 191,831 Operating expenses 108,513 95,603 78,685 Depreciation and amortization 97,810 89,397 78,972 Operating income 58,198 51,415 34,174 Gain on sale of interests in property and unconsolidated entities, net 583 1,585 1,014 Interest expense, taxes, and other, net (52,477 ) (45,906 ) (32,754 ) Net income from the Company's unconsolidated real estate entities $ 6,304 $ 7,094 $ 2,434 Our share of income (loss) from the Company's unconsolidated real estate entities $ 541 $ 1,395 $ (1,745 )
Schedule of Combined Balance Sheets for Unconsolidated Venture Properties	The following table presents the combined balance sheets for the unconsolidated joint venture properties for the periods indicated above during which the Company accounted for these investments as unconsolidated entities as of December 31, 2018 and 2017 : December 31, 2018 2017 Assets: Investment properties at cost, net $ 1,964,699 $ 1,972,208 Construction in progress 21,019 44,817 Cash and cash equivalents 43,169 40,955 Tenant receivables and accrued revenue, net 31,661 30,866 Deferred costs and other assets (1) 147,481 174,665 Total assets $ 2,208,029 $ 2,263,511 Liabilities and Members’ Equity: Mortgage notes payable $ 1,292,801 $ 1,302,143 Accounts payable, accrued expenses, intangibles, and deferred revenues (2) 137,073 148,273 Total liabilities 1,429,874 1,450,416 Members’ equity 778,155 813,095 Total liabilities and members’ equity $ 2,208,029 $ 2,263,511 Our share of members’ equity, net $ 396,229 $ 414,245 (1) Includes value of acquired in-place leases and acquired above-market leases with a net book value of $91,609 and $107,869 as of December 31, 2018 and 2017 , respectively. (2) Includes the net book value of below market leases of $57,392 and $69,269 as of December 31, 2018 and 2017 , respectively.
Investments In and Advances To Affiliates and Equity Method Investments	The following table presents the investment in and advances to (cash distributions and losses in) unconsolidated entities for the periods indicated above during which the Company accounted for these investments as unconsolidated entities as of December 31, 2018 and 2017 : December 31, 2018 2017 Our share of members’ equity, net $ 396,229 $ 414,245 Advances and excess investment 21,557 22,173 Net investment in and advances to unconsolidated entities, at equity (1) $ 417,786 $ 436,418 (1) Includes $433,207 and $451,839 of investment in and advances to unconsolidated entities, at equity as of December 31, 2018 and 2017 , respectively, and $15,421 and $15,421 of cash distributions and losses in unconsolidated entities, at equity as of December 31, 2018 and 2017 , respectively.

Indebtedness (Tables)

Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Total mortgage indebtedness at December 31, 2018 and 2017 was as follows: 2018 2017 Face amount of mortgage loans $ 980,276 $ 1,152,436 Fair value adjustments, net 5,764 8,338 Debt issuance cost, net (2,771 ) (3,692 ) Carrying value of mortgage loans $ 983,269 $ 1,157,082
Roll Forward of Mortgage Indebtedness	A roll forward of mortgage indebtedness from December 31, 2017 to December 31, 2018 is summarized as follows: Balance at December 31, 2017 $ 1,157,082 Debt amortization payments (18,322 ) Repayment of debt (94,838 ) Debt borrowings, net of issuance costs 34,782 Debt canceled upon lender foreclosures, net of debt issuance costs (93,988 ) Amortization of fair value and other adjustments (2,574 ) Amortization of debt issuance costs 1,127 Balance at December 31, 2018 $ 983,269
Summary of Non-recourse Mortgage Loans	The following table summarizes the key terms of each mortgage loan: Property Principal Debt issuance costs Net debt issuance Interest Rate Maturity Date The Arboretum $ 59,400 $ (452 ) $ 58,948 4.13 % June 1, 2027 Gateway Centers 112,500 (709 ) 111,791 4.03 % June 1, 2027 Oklahoma City Properties 43,279 (427 ) 42,852 3.90 % June 1, 2027 Total $ 215,179 $ (1,588 ) $ 213,591
Schedule of Debt	The following table identifies our total unsecured debt outstanding at December 31, 2018 and December 31, 2017 : December 31, December 31, Notes payable: Face amount - 3.850% Notes due 2020 (the "Exchange Notes") (1) $ 250,000 $ 250,000 Face amount - 5.950% Notes due 2024 (2) 750,000 750,000 Debt discount, net (9,680 ) (11,086 ) Debt issuance costs, net (7,623 ) (9,542 ) Total carrying value of notes payable $ 982,697 $ 979,372 Unsecured term loans: (8) Face amount - Term Loan (3)(4) $ 350,000 $ — Face amount - December 2015 Term Loan (5) 340,000 340,000 Face amount - June 2015 Term Loan (6) — 270,000 Debt issuance costs, net (4,491 ) (3,305 ) Total carrying value of unsecured term loans $ 685,509 $ 606,695 Revolving credit facility: (3)(7) Face amount $ 290,000 $ 155,000 Debt issuance costs, net (3,998 ) (540 ) Total carrying value of revolving credit facility $ 286,002 $ 154,460 (1) The Exchange Notes were issued at a 0.028% discount, bear interest at 3.850% per annum and mature on April 1, 2020. (2) The 5.950% Notes due 2024 were issued at a 1.533% discount, bear interest at 5.950% per annum, and mature on August 15, 2024. The interest rate could vary in the future based upon changes to the Company's credit ratings (see Note 13 - "Subsequent Events"). (3) The unsecured revolving credit facility, or "Revolver" and unsecured term loan, or "Term Loan" are collectively known as the "Facility." (4) The Term Loan bears interest at one-month LIBOR plus 1.45% per annum and will mature on December 30, 2022. We had interest rate swap agreements totaling $270.0 million , which effectively fixed the interest rate on a portion of the Term Loan at 2.56% per annum through June 30, 2018. On May 9, 2018, we executed swap agreements totaling $250.0 million to replace matured swap agreements, which effectively fix the interest rate on a portion of the Term Loan at 4.21% through June 30, 2021. At December 31, 2018 , the applicable interest rate on the unhedged portion of the Term Loan was one-month LIBOR plus 1.45% or 3.95% . (5) The December 2015 Term Loan bears interest at one-month LIBOR plus 1.80% per annum and will mature on January 10, 2023. We have interest rate swap agreements totaling $340.0 million , which effectively fix the interest rate at 3.51% per annum through maturity. (6) The June 2015 Term Loan bore interest at one-month LIBOR plus 1.45% per annum. During the year ended December 31, 2017, the Company repaid $230.0 million of the June 2015 Term Loan and wrote off $0.9 million of debt issuance costs. On January 22, 2018, the Company repaid the remaining $270.0 million outstanding with proceeds from the amended and restated Facility (as discussed above) and wrote off $0.5 million of debt issuance costs. (7) As of December 31, 2017, the Revolver provided borrowings on a revolving basis up to $900.0 million , bore interest at one-month LIBOR plus 1.25% , and was initially scheduled to mature on May 30, 2018. On January 22, 2018, we amended the terms of the Revolver to provide borrowings on a revolving basis up to $650.0 million at one-month LIBOR plus 1.25% . Under the amended terms, the Revolver will mature on December 30, 2021 , subject to two six month extensions available at our option subject to compliance with terms of the Facility and payment of a customary extension fee. Upon the amended terms, the Company wrote off $0.3 million of debt issuance costs. At December 31, 2018 , we had an aggregate available borrowing capacity of $359.8 million under the Revolver, net of $0.2 million reserved for outstanding letters of credit. At December 31, 2018 , the applicable interest rate on the Revolver was one-month LIBOR plus 1.25% , or 3.75% (see Note 13 - "Subsequent Events"). (8) While we have interest rate swap agreements in place that fix the LIBOR portion of the rates as noted above, the spread over LIBOR could vary in the future based upon changes to the Company's credit ratings (see Note 13 - "Subsequent Events").
Schedule of Line of Credit Facilities	The following table presents the borrowings and paydowns on the Revolver during the years ended December 31, 2018 and December 31, 2017 : 2018 2017 Beginning Balance $ 155,000 $ 308,000 Borrowings 332,000 350,000 Paydowns (197,000 ) (503,000 ) Ending Balance $ 290,000 $ 155,000
Schedule of Maturities of Long-term Debt	Scheduled principal repayments on indebtedness (including extension options) as of December 31, 2018 are as follows: 2019 $ 64,281 2020 344,584 2021 320,513 2022 771,856 2023 404,121 Thereafter 1,054,921 Total principal maturities 2,960,276 Bond Discount (9,680 ) Fair value adjustments, net 5,764 Debt issuance costs, net (18,883 ) Total mortgages and unsecured indebtedness $ 2,937,477
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The book value and fair value of these financial instruments along with the related discount rate assumptions as of December 31, 2018 and 2017 are summarized as follows: 2018 2017 Book value of fixed- rate mortgages (1) $ 915,276 $ 1,000,936 Fair value of fixed-rate mortgages $ 928,129 $ 1,024,890 Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages 4.57 % 4.19 % Book value of fixed-rate unsecured debt (1) $ 1,590,000 $ 1,610,000 Fair value of fixed-rate unsecured debt $ 1,485,672 $ 1,616,810 Weighted average discount rates assumed in calculation of fair value for fixed-rate unsecured debt 5.62 % 4.27 % (1) Excludes deferred financing fees and applicable debt discounts.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	The table below presents the fair value of the Company's derivative financial instruments as well as their classification on the consolidated balance sheet as of December 31, 2018 and 2017 : Derivatives designated as hedging instruments: Balance Sheet December 31, 2018 December 31, 2017 Interest rate products Asset Derivatives Deferred costs and other assets $ 9,306 $ 7,413 Interest rate products Liability Derivatives Accounts payable, accrued expenses, intangibles and deferred revenues $ 1,913 $ —
Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss)	The table below presents the effect of the Company's derivative financial instruments on the consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 : Derivatives in Cash Flow Hedging Relationships Location of Gain or (Loss) Recognized in Income on Derivatives For the Year Ended December 31, 2018 2017 2016 Amount of Gain or (Loss) Recognized in OCI on Derivative $ 1,054 $ 1,256 $ (3,580 ) Amount of Gain or (Loss) Reclassified from AOCI into Income Interest expense $ (2,338 ) $ 1,145 $ 7,381 The table below presents the effect of the Company's derivative financial instruments on the consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 : Effect of Cash Flow Hedges on Consolidated Statements of Operations For the year ended December 31, 2018 2017 2016 Total interest (expense) presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded $ (141,987 ) $ (126,541 ) $ (136,225 ) Amount of (gain) loss reclassified from accumulated other comprehensive income into interest expense $ (2,338 ) $ 1,145 $ 7,381
Fair Value Measurements, Recurring and Nonrecurring	The tables below presents the Company’s net assets and liabilities measured at fair value as of December 31, 2018 and 2017 aggregated by the level in the fair value hierarchy within which those measurements fall: Quoted Prices in Active Markets for Identical Liabilities Significant Other Observable Inputs Significant Unobservable Inputs 3) Balance at December 31, 2018 Derivative instruments, net $ — $ 7,393 $ — $ 7,393 Quoted Prices in Active Markets for Identical Liabilities Significant Other Observable Inputs Significant Unobservable Inputs 3) Balance at December 31, 2017 Derivative instruments, net $ — $ 7,413 $ — $ 7,413

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of Share Based Compensation Arrangement By Share Based Payment Award LTIP Units Earned and Aggregate Grant Date Fair Values Adjusted For Estimated Forfeitures	A summary of the Inducement LTIP Units and changes during the year ended December 31, 2018 is listed below: Activity for the Year Ended December 31, 2018 Inducement LTIP Units Weighted Outstanding unvested at beginning of year 37,868 $ 17.82 Units granted — $ — Units vested (25,036 ) $ 17.97 Units forfeited — $ — Outstanding unvested at end of year 12,832 $ 17.53
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	The following table summarizes the assumptions used to value the PSUs under a Monte Carlo simulation model: 2018 Annual Long-Term Incentive Awards 2017 Annual Long-Term Incentive Awards Risk free rate 2.39% 1.49% Volatility 24.70% 20.52% Dividend yield 16.39% 10.44% The total amount of compensation to be recognized over the performance period, and the assumptions used to value the 2016 and 2015 Annual Long-Term Incentive Awards are provided below: 2016 2015 Fair value per share of Allocated RSUs/Units $ 3.81 $ 7.07 Total amount to be recognized over the performance period $ 2,516 $ 4,656 Risk free rate 0.44 % 0.20 % Volatility 31.40 % 22.66 % Dividend yield 10.05 % 6.03 % The following table summarizes the issuance of the 2018 Annual Long-Term Incentive Awards and 2017 Annual Long-Term Incentive Awards, respectively: 2018 Annual Long-Term Incentive Awards 2017 Annual Long-Term Incentive Awards Grant Date February 20, 2018 February 21, 2017 RSUs issued 587,000 358,198 Grant date fair value per unit $6.10 $9.58 PSUs issued 587,000 358,198 Grant date fair value per unit $4.88 $7.72
Nonvested Restricted Stock Shares Activity	A summary of the status of the WPG Restricted Shares at December 31, 2018 and changes during the year are presented below: Activity for the Year Ended December 31, 2018 Restricted Weighted Outstanding at beginning of year 30,535 $ 18.18 Shares granted — $ — Shares vested/forfeited (21,502 ) $ 18.18 Outstanding at end of year 9,033 $ 18.18
Schedule of Nonvested Restricted Stock Units Activity	A summary of the status of the WPG RSUs at December 31, 2018 and changes during the year are presented below: Activity for the Year Ended December 31, 2018 RSUs Weighted Outstanding unvested at beginning of year 1,157,576 $ 9.40 RSUs granted 812,440 $ 6.28 RSUs vested/forfeited (400,703 ) $ 8.29 Outstanding unvested at end of year 1,569,313 $ 8.07
Share-based Compensation, Stock Options, Activity	A summary of the status of the Company's option plans at December 31, 2018 and changes during the year are listed below: Activity for the Year Ended December 31, 2018 Stock Options Weighted Outstanding at beginning of year 794,014 $ 2.26 Options granted — $ — Options exercised — $ — Options forfeited/expired (114,273 ) $ 3.36 Outstanding at end of year 679,741 $ 2.08
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of each option grant was the date of the grant using the Black-Scholes options pricing mode. The weighted average per share value of options granted as well as the assumptions used to value the grants is listed below: 2016 Weighted average per share value of options granted/converted $ 0.62 Weighted average risk free rates 1.4 % Expected average lives in years 6.0 years Annual dividend rates $ 1.00 Weighted average volatility 28.3 % Forfeiture rate 10 %
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	The following table summarizes information regarding the options outstanding at December 31, 2018 : Options Outstanding Options Exercisable Range of Number Weighted Weighted Number Weighted Weighted $1.79 2,348 0.2 $1.79 2,348 0.2 $1.79 $5.76 14,758 1.2 $5.76 14,758 1.2 $5.76 $11.97 36,267 2.3 $11.97 36,267 2.3 $11.97 $12.67 55,419 3.4 $12.67 55,419 3.4 $12.67 $16.56 105,381 4.4 $16.56 105,381 4.4 $16.56 $13.10 72,068 5.3 $13.10 72,068 5.3 $13.10 $14.28 226,000 6.4 $14.28 226,000 6.4 $14.28 $9.95 167,500 7.4 $9.95 111,663 7.4 $9.95 679,741 5.6 $12.96 623,904 5.4 $13.23
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value	The following table summarizes the aggregate intrinsic value of options that are: outstanding, exercisable and exercised. It also depicts the fair value of options that have vested. For the Year Ended December 31, 2018 Aggregate intrinsic value of options outstanding $ 7 Aggregate intrinsic value of options exercisable $ 7 Aggregate intrinsic value of options exercised $ — Aggregate fair value of options vested $ 154
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	During the years ended December 31, 2018, 2017 and 2016 , the Company recorded share award related compensation expense pertaining to the award and option plans noted above within the consolidated statements of operations and comprehensive income as indicated below (amounts in millions): For the Year Ended December 31, 2018 2017 2016 Merger, restructuring and transaction costs $ — $ — $ 9.5 General and administrative and property operating 8.3 6.4 4.6 Total expense $ 8.3 $ 6.4 $ 14.1

Rentals Under Operating Leases

Rentals Under Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Operating Leases	Future minimum rentals to be received under non-cancelable operating leases for each of the next five years and thereafter, excluding tenant reimbursements of operating expenses and percentage rent based on tenant sales volume, as of December 31, 2018 are as follows: 2019 $ 401,604 2020 336,602 2021 270,936 2022 222,569 2023 175,206 Thereafter 423,765 $ 1,830,682

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments due under these leases for each of the next five years and thereafter, excluding applicable extension options, as of December 31, 2018 are as follows: 2019 $ 2,029 2020 2,049 2021 2,069 2022 2,099 2023 1,427 Thereafter 21,377 $ 31,050

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	Charges for properties which for the year ended December 31, 2016 are as follows: For the Year Ended December 31, 2016 Consolidated Unconsolidated Property management and common costs, services and other $ 8,791 $ 196 Insurance premiums $ — $ — Advertising and promotional programs $ 102 $ 6 Capitalized leasing and development fees $ 3,166 $ 23

Earnings Per Common Share_Unit

Earnings Per Common Share/Unit (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of WPG Inc.'s basic and diluted earnings per common share: For the Year Ended December 31, 2018 2017 2016 Earnings Per Common Share, Basic: Net income attributable to common shareholders - basic $ 79,572 $ 183,031 $ 53,099 Weighted average shares outstanding - basic 187,696,339 186,829,385 185,633,582 Earnings per common share, basic $ 0.42 $ 0.98 $ 0.29 Earnings Per Common Share, Diluted: Net income attributable to common shareholders - basic $ 79,572 $ 183,031 $ 53,099 Net income attributable to common unitholders 14,735 34,222 10,034 Net income attributable to common shareholders - diluted $ 94,307 $ 217,253 $ 63,133 Weighted average common shares outstanding - basic 187,696,339 186,829,385 185,633,582 Weighted average operating partnership units outstanding 34,703,770 34,808,890 34,304,109 Weighted average additional dilutive securities outstanding 603,674 337,508 803,805 Weighted average common shares outstanding - diluted 223,003,783 221,975,783 220,741,496 Earnings per common share, diluted $ 0.42 $ 0.98 $ 0.29 The following table sets forth the computation of WPG L.P.'s basic and diluted earnings per common unit: For the Year Ended December 31, 2018 2017 2016 Earnings Per Common Unit, Basic and Diluted: Net income attributable to common unitholders - basic and diluted $ 94,307 $ 217,253 $ 63,133 Weighted average common units outstanding - basic 222,400,109 221,638,275 219,937,691 Weighted average additional dilutive securities outstanding 603,674 337,508 803,805 Weighted average shares outstanding - diluted 223,003,783 221,975,783 220,741,496 Earnings per common unit, basic and diluted $ 0.42 $ 0.98 $ 0.29

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Quarterly 2018 and 2017 data is summarized in the table below. Quarterly amounts may not sum to annual amounts due to rounding. First Second Third Fourth 2018 Total revenue $ 180,340 $ 178,728 $ 179,916 $ 184,321 Net income $ 20,185 $ 15,519 $ 4,115 $ 68,836 Washington Prime Group Inc.: Net income attributable to the Company $ 17,524 $ 13,594 $ 3,971 $ 58,515 Net income attributable to common shareholders $ 14,016 $ 10,086 $ 463 $ 55,007 Earnings per common share—basic and diluted $ 0.07 $ 0.05 $ 0.00 $ 0.29 Washington Prime Group, L.P.: Net income attributable to unitholders $ 20,185 $ 15,519 $ 4,115 $ 68,836 Net income attributable to common unitholders $ 16,617 $ 11,951 $ 547 $ 65,192 Earnings per common unit—basic and diluted $ 0.07 $ 0.05 $ 0.00 $ 0.29 2017 Total revenue $ 202,394 $ 189,171 $ 179,320 $ 187,237 Net income (loss) $ 14,624 $ 164,500 $ (10,664 ) $ 63,133 Washington Prime Group Inc.: Net income (loss) attributable to the Company $ 12,810 $ 138,975 $ (8,395 ) $ 53,673 Net income (loss) attributable to common shareholders $ 9,302 $ 135,467 $ (11,903 ) $ 50,165 Earnings (loss) per common share—basic $ 0.05 $ 0.73 $ (0.06 ) $ 0.27 Earnings (loss) per common share—diluted $ 0.05 $ 0.72 $ (0.06 ) $ 0.27 Washington Prime Group, L.P.: Net income (loss) attributable to unitholders $ 14,624 $ 164,500 $ (10,664 ) $ 63,133 Net income (loss) attributable to common unitholders $ 11,056 $ 160,932 $ (14,232 ) $ 59,497 Earnings (loss) per common unit—basic $ 0.05 $ 0.73 $ (0.06 ) $ 0.27 Earnings (loss) per common unit—diluted $ 0.05 $ 0.72 $ (0.06 ) $ 0.27

Organization (Details)

Organization (Details) ft² in Millions, $ in Millions	Jan. 15, 2015USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018ft²shopping_center
Real Estate Properties [Line Items]
Restructuring charges		$ 29.6
Glimcher Realty Trust [Member]
Real Estate Properties [Line Items]
Business combination, consideration transferred	$ 4,200
Employee Severance [Member]
Real Estate Properties [Line Items]
Restructuring and related cost, expected cost		2
Stock Compensation Benefits [Member]
Real Estate Properties [Line Items]
Restructuring and related cost, expected cost		0.5
Severance and Restructuring [Member]
Real Estate Properties [Line Items]
Severance costs		25.5
Non-cash Items [Member]
Real Estate Properties [Line Items]
Severance costs		9.5
Strategic Alternatives Research Fees [Member]
Real Estate Properties [Line Items]
Severance costs		$ 4.1
Shopping Centers [Member]
Real Estate Properties [Line Items]
Number of real estate properties | shopping_center			108
Area of real estate property | ft²			58

Basis of Presentation and Pri_2

Basis of Presentation and Principles of Consolidation and Combination (Details)	Dec. 31, 2018variable_interest_entitypropertyshopping_center	Dec. 31, 2017	Dec. 31, 2016
Real Estate Properties [Line Items]
Number of VIEs | variable_interest_entity	2
Washington Prime Group, L.P. [Member]
Real Estate Properties [Line Items]
Noncontrolling interest, ownership percentage by parent	84.40%	84.30%
Washington Prime Group, L.P. [Member] | Weighted Average [Member]
Real Estate Properties [Line Items]
Noncontrolling interest, ownership percentage by parent	84.40%	84.30%	84.10%
Wholly Owned Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	91
Partially Owned Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	4
Corporate Joint Venture [Member]
Real Estate Properties [Line Items]
Number of real estate properties	13
Shopping Centers [Member]
Real Estate Properties [Line Items]
Number of real estate properties | shopping_center	108

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative 1 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)segmentproperty	Dec. 31, 2017USD ($)property	Dec. 31, 2016USD ($)
Real Estate [Line Items]
Interest costs capitalized | $	$ 2,234	$ 1,521	$ 2,640
Number of reportable segments | segment	1
Building and Building Improvements [Member] | Minimum [Member]
Real Estate [Line Items]
Property, plant and equipment, useful life	5 years
Building and Building Improvements [Member] | Maximum [Member]
Real Estate [Line Items]
Property, plant and equipment, useful life	40 years
Equipment and Fixture [Member] | Minimum [Member]
Real Estate [Line Items]
Property, plant and equipment, useful life	3 years
Equipment and Fixture [Member] | Maximum [Member]
Real Estate [Line Items]
Property, plant and equipment, useful life	10 years
Unconsolidated Properties [Member]
Real Estate [Line Items]
Number of real estate properties | property	13	13

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - New Accounting Pronouncements Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)segmentlease	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment	1
Cumulative effect of accounting standards				$ 2,474
Change in restricted cash related to cash flows provided by operating activities	$ 287,245	$ 324,631	$ 288,987
Change in restricted cash related to cash flows used in investing activities	(179,828)	93,850	(124,485)
Restricted cash related to cash flows in financing activities	$ (116,534)	(436,793)	(231,148)
Number of ground leases | lease	4
Number of properties subject to office leases | lease	2
Number of garage leases | lease	1
Future minimum payments due, operating leases	$ 31,100
Deferred leasing cost	17,700	16,900
AOCI Attributable to Parent [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting standards				584
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting standards				2,500
Accounting Standards Update 2017-12 [Member] | Restatement Adjustment [Member] | AOCI Attributable to Parent [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting standards				$ 600
Restricted Cash Changes [Member] | Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in restricted cash related to cash flows provided by operating activities		2,900	800
Change in restricted cash related to cash flows used in investing activities		6,400	1,500
Restricted cash related to cash flows in financing activities		$ 1,700	$ 10,400
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future minimum payments due, operating leases	$ 20,000

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Changes to Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues	$ 253,862	$ 262,524	$ 264,998
Capital in excess of par value	1,247,639	1,240,094	1,240,483
Accumulated deficit	(456,924)	(348,704)	(350,594)
Accumulated other comprehensive income	6,400	7,504	6,920
Noncontrolling interests	$ 148,561	168,107	$ 167,718
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues		(2,474)
Capital in excess of par value		(389)
Accumulated deficit		2,474
Accumulated other comprehensive income		0
Noncontrolling interests		389
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues		0
Capital in excess of par value		0
Accumulated deficit		(584)
Accumulated other comprehensive income		584
Noncontrolling interests		$ 0

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Changes to Income Statement from ASU 2014-09 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other income	$ 30,504	$ 24,331	$ 21,302
Balances Without Adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other income	29,954
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other income	$ 550

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Changes to Balance Sheet from ASU 2014-09 (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues	$ 253,862	$ 262,524	$ 264,998
Capital in excess of par value	1,247,639	1,240,094	1,240,483
Accumulated deficit	(456,924)	(348,704)	(350,594)
Noncontrolling interests	148,561	168,107	$ 167,718
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues		(2,474)
Capital in excess of par value		(389)
Accumulated deficit		2,474
Noncontrolling interests		$ 389
Balances Without Adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues	256,886
Capital in excess of par value	1,248,111
Accumulated deficit	(459,948)
Noncontrolling interests	148,089
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts payable, accrued expenses, intangibles, and deferred revenues	(3,024)
Capital in excess of par value	(472)
Accumulated deficit	3,024
Noncontrolling interests	$ 472

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Summary of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash and cash equivalents	$ 42,542	$ 52,019	$ 59,353
Restricted cash	18,542	18,182	29,160
Total cash, cash equivalents and restricted cash	$ 61,084	$ 70,201	$ 88,513	$ 155,159

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Deferred Costs and Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Deferred leasing costs and corporate improvements, net	$ 74,260	$ 79,079
In-place lease intangibles, net	38,453	46,627
Acquired above market lease intangibles, net	18,827	24,254
Mortgage and other escrow deposits	18,542	18,182
Prepaids, notes receivable and other assets, net	19,053	20,953
Deferred costs and other assets	169,135	$ 189,095
Extended Maturity [Member] | Promissory Note Related to Sale of Knoxville Center [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment	$ 5,300

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Deferred Leasing Costs and Corporate Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Deferred leasing costs	$ 142,903	$ 143,667
Corporate improvements	6,072	5,324
Accumulated amortization	(74,715)	(69,912)
Deferred lease costs and corporate improvements, net	74,260	79,079
Amortization of deferred leasing fees	$ 27,900	$ 25,900	$ 26,000

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Revenue by Major Source (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
Disaggregation of Revenue [Line Items]
Minimum rent									$ 492,169	$ 516,386	$ 572,781
Overage rent									9,313	9,115	12,882
Tenant reimbursements									191,319	208,290	236,510
Other income									30,504	24,331	21,302
Total revenues	$ 184,321	$ 179,916	$ 178,728	$ 180,340	$ 187,237	$ 179,320	$ 189,171	$ 202,394	723,305	758,122	843,475
Lease related
Disaggregation of Revenue [Line Items]
Minimum rent									492,169	516,386	572,781
Overage rent									9,313	9,115	12,882
Tenant reimbursements									191,319	208,290	236,510
Other income									3,457	3,492	1,310
Total revenues									696,258	737,283	823,483
Ancillary
Disaggregation of Revenue [Line Items]
Other income									10,275	9,848	10,111
Total revenues									10,275	9,848	10,111
Fee related
Disaggregation of Revenue [Line Items]
Other income									9,527	7,906	6,709
Total revenues									9,527	7,906	6,709
Other
Disaggregation of Revenue [Line Items]
Other income									7,245	3,085	3,172
Total revenues									$ 7,245	$ 3,085	$ 3,172

Summary of Significant Accou_13

Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Balance, beginning of year	$ 7,867	$ 8,578	$ 4,222
Provision for credit losses	5,826	5,068	4,508
Accounts deconsolidated upon joint venture formation (see Note 5)	0	(1,271)	0
Accounts written off, net of recoveries, and other	(3,562)	(4,508)	(152)
Balance, end of year	$ 10,131	$ 7,867	$ 8,578

Summary of Significant Accou_14

Summary of Significant Accounting Policies - Distributions Paid Per Common and Preferred Share On a Tax Basis (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common shares [Member]
Dividends Payable [Line Items]
Distributions, per share, ordinary income (in dollars per share)	$ 1	$ 0.4306	$ 0.6128
Capital gain (in dollars per share)	0	0.5694	0
Non-dividend distributions (in dollars per share)	0	0	0.3872
Distributions, per share (in dollars per share)	$ 1	$ 1	$ 1
Distributions, per share, ordinary income, percentage	100.00%	43.06%	61.28%
Capital gain, percentage	0.00%	56.94%	0.00%
Non-dividend distributions, percentage	0.00%	0.00%	38.72%
Distributions, per share, percentage	100.00%	100.00%	100.00%
Series H Preferred Stock [Member]
Dividends Payable [Line Items]
Distributions, per share, ordinary income (in dollars per share)	$ 1.8752	$ 1.0093	$ 1.4064
Capital gain (in dollars per share)	0	1.3347	0
Distributions, per share (in dollars per share)	$ 1.8752	$ 2.3440	$ 1.4064
Distributions, per share, ordinary income, percentage	100.00%	43.06%	100.00%
Capital gain, percentage	0.00%	56.94%	0.00%
Distributions, per share, percentage	100.00%	100.00%	100.00%
Series I Preferred Stock [Member]
Dividends Payable [Line Items]
Distributions, per share, ordinary income (in dollars per share)	$ 1.7188	$ 0.9251	$ 1.2891
Capital gain (in dollars per share)	0	1.2234	0
Distributions, per share (in dollars per share)	$ 1.7188	$ 2.1485	$ 1.2891
Distributions, per share, ordinary income, percentage	100.00%	43.06%	100.00%
Capital gain, percentage	0.00%	56.94%	0.00%
Distributions, per share, percentage	100.00%	100.00%	100.00%

Summary of Significant Accou_15

Summary of Significant Accounting Policies - Income and Other Taxes Narrative (Details) - Taxable Real Estate Investment Trust Subsidiaries [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Deferred tax assets, operating loss carryforwards	$ 0
Operating loss carryforwards, valuation allowance	0
Deferred tax assets, net of valuation allowance	0
Income and Other Taxes [Member]
Income Tax Contingency [Line Items]
Federal income tax expense (benefit)	$ 525,000	$ (87,000)	$ 227,000

Summary of Significant Accou_16

Summary of Significant Accounting Policies - Carrying Amount of WPG Incs.'s Noncontrolling Interests (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Limited partners' interests in WPG L.P.	$ 147,493		$ 166,660
Noncontrolling interests in properties	1,068		1,058
Total noncontrolling interests	$ 148,561	$ 168,107	$ 167,718

Summary of Significant Accou_17

Summary of Significant Accounting Policies - Redeemable Noncontrolling Interests for WPG Inc. (Details) - Series I-1 Preferred Units [Member] - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Preferred units, outstanding (in shares)	130,592	130,592
Preferred stock dividend rate	7.30%

Investment in Real Estate - Inv

Investment in Real Estate - Investment Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Land	$ 836,214	$ 807,202
Buildings and improvements	4,980,939	4,908,794
Total land, buildings and improvements	5,817,153	5,715,996
Furniture, fixtures and equipment	97,552	91,764
Investment properties at cost	5,914,705	5,807,760
Less: accumulated depreciation	2,283,764	2,139,620
Investment properties at cost, net	3,630,941	3,668,140
Construction in progress included above	$ 35,068	$ 46,046

Investment in Real Estate - 201

Investment in Real Estate - 2018 Acquisitions (Details) $ in Millions	Apr. 11, 2018USD ($)store	Jun. 30, 2018USD ($)	Apr. 24, 2018USD ($)
Business Acquisition [Line Items]
Below market lease, acquired		$ 4.9
Below market lease, weighted average useful life		9 years 219 days
Asset acquisition capitalized transaction costs		$ 0.6
Sears Department Stores and Auto Centers [Member]
Business Acquisition [Line Items]
Stores acquired | store	4
Purchase price	$ 28.5
Proceeds from credit facility to fund asset acquisition	13.4
Proceeds from sale of real estate to fund asset acquisition	9.7
Proceeds from joint venture to fund asset acquisition	$ 5.4
Southgate Mall, Missoula, Montana [Member]
Business Acquisition [Line Items]
Purchase price			$ 58
Above Market Leases and Lease in Place [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 10.3
Weighted average useful life		11 years 182 days

Investment in Real Estate - Sum

Investment in Real Estate - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net cash paid for acquisitions		$ 80,108	$ 0	$ 0
Glimcher Realty Trust [Member]
Business Acquisition [Line Items]
Investment properties	$ 72,647
Investment in and advances to unconsolidated entities, at equity	5,543
Deferred costs and other assets	10,311
Accounts payable, accrued expenses, intangibles, and deferred revenue	(8,393)
Net cash paid for acquisitions	$ 80,108

Investment in Real Estate - 2_2

Investment in Real Estate - 2018 Dispositions (Details) $ in Thousands	Feb. 11, 2019outparcel	Jan. 18, 2019USD ($)outparcel	Nov. 16, 2018USD ($)outparcel	Oct. 31, 2018USD ($)outparcel	Jul. 27, 2018USD ($)outparcel	Jun. 29, 2018USD ($)outparcel	Jan. 12, 2018USD ($)outparcel	Jun. 30, 2019USD ($)outparcel	Dec. 31, 2018USD ($)outparcel	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of assets									$ 24,602	$ 124,771	$ (1,987)
Restaurant Outparcels [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Parcels Sold | outparcel			1	2	2	5	10		20
Purchase Price			$ 3,195	$ 1,718	$ 4,607	$ 9,503	$ 13,692		$ 32,715
Sales Proceeds			$ 3,166	$ 1,714	$ 4,530	$ 9,423	$ 13,506		$ 32,339
Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Proceeds		$ 12,100
Subsequent Event [Member] | Restaurant Outparcels [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Parcels Sold | outparcel	1	8
Sales Proceeds		$ 12,200
Scenario, Forecast [Member] | Subsequent Event [Member] | Restaurant Outparcels [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Proceeds								$ 37,500
Number of parcels projected to sell | outparcel								24

Investment in Real Estate - 2_3

Investment in Real Estate - 2017 and 2016 Dispositions (Details) $ in Millions

Jun. 13, 2017

Aug. 19, 2016USD ($)

Jun. 29, 2016USD ($)

Jan. 29, 2016USD ($)

Dec. 31, 2017USD ($)property

Dec. 31, 2016USD ($)

Dec. 31, 2018USD ($)

Nov. 03, 2017USD ($)

Jun. 07, 2017USD ($)

May 16, 2017USD ($)ft²

May 12, 2017property

Feb. 21, 2017USD ($)

Jan. 10, 2017USD ($)

Nov. 10, 2016USD ($)

Aug. 09, 2016USD ($)

Colonial Park Mall [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 15

Malibu Lumber Yard [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Percentage of interest in property sold

49.00%

Morgantown Commons [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 6.7

Vacant Anchor Parcel in Indian Mound Mall [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 0.8

Area of real estate property | ft²

80,000

Gulf View Square and River Oaks Center [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 42

Virginia Center Commons [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 9

Morgantown Commons, Vacant Anchor Parcel at Indian Mound Mall, Gulf View Square, River Oaks Center, and Virginia Community Center Commons [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (loss) on disposition of assets

$ 124.8

Richmond Town Square [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 7.3

Knoxville Center [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 10.1

Proceeds from sale of real estate

$ 3.9

Financing receivable, current

$ 6.2

Interest rate

5.50%

Forest Mall and Northlake Mall [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Consideration received

$ 30

Gain (loss) on disposition of assets

$ 2

Proceeds from sale of real estate

10

Financing receivable, current

$ 20

Interest rate

6.00%

Proceeds from collection of notes receivables

$ 4.4

O'Connor Joint Venture II [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Number of real estate properties | property

7

6

Gain (loss) on disposition of assets

$ 126.1

Promissory Note Related to Sale of Knoxville Center [Member] | Extended Maturity [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Financing receivable, recorded investment

$ 5.3

Investment in Real Estate - Int

Investment in Real Estate - Intangible Assets and Liabilities Associated with Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Above-market leases - Company is lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Asset/Liability	$ 48,373	$ 51,315
Below-market leases - Company is lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Asset/Liability	117,395	124,475
In-place leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Asset/Liability	109,379	120,159
Amortization of intangible assets	14,780	18,457	$ 24,269
Above/Below Market Leases, Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization as a net increase to minimum rents in the amounts	$ 8,971	$ 7,323	$ 9,930

Investment in Real Estate - I_2

Investment in Real Estate - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Above-market leases - Company is lessor [Member] | Deferred costs and other assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization (in years)	6 years 329 days
Intangible Asset/Liability	$ 18,827	$ 24,254
Below-market leases - Company is lessor [Member] | Accounts payable, accrued expenses, intangibles and deferred revenues [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization (in years)	12 years 219 days
Intangible Asset/Liability	$ 66,651	77,870
In-place leases [Member] | Deferred costs and other assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization (in years)	11 years 37 days
Intangible Asset/Liability	$ 38,453	$ 46,627

Investment in Real Estate - Net

Investment in Real Estate - Net Amortization of Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total net intangible amortization, 2019	$ (4,864)
Total net intangible amortization, 2020	(2,359)
Total net intangible amortization, 2021	1,093
Total net intangible amortization, 2022	1,368
Total net intangible amortization, 2023	1,334
Total net intangible amortization, thereafter	12,799
Above/Below-Market Leases-Lessor	57,392	$ 69,269
Total Net Intangible Amortization	9,371
Above/Below Market Leases, Lessor [Member]
Finite-Lived Intangible Assets [Line Items]
Above/below-market leases, 2019	4,339
Above/below-market leases, 2020	4,606
Above/below-market leases, 2021	4,677
Above/below-market leases, 2022	4,187
Above/below-market leases, 2023	3,619
Above/below-market leases, thereafter	26,396
Above/Below-Market Leases-Lessor	47,824
In-place leases [Member]
Finite-Lived Intangible Assets [Line Items]
In-place leases, 2019	(9,203)
In-place leases, 2020	(6,965)
In-place leases, 2021	(3,584)
In-place leases, 2022	(2,819)
In-place leases, 2023	(2,285)
In-place leases, thereafter	(13,597)
In-place Leases	$ (38,453)

Investment in Real Estate - Imp

Investment in Real Estate - Impairment (Details) - USD ($) $ in Thousands	Nov. 03, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 07, 2017
Business Acquisition [Line Items]
Impairment of real estate		$ 0	$ 66,925	$ 21,879
Rushmore Mall [Member]
Business Acquisition [Line Items]
Real estate property fair value			37,500
Real estate property carrying value			75,000
Impairment of real estate			37,500
Colonial Park Mall [Member]
Business Acquisition [Line Items]
Impairment of real estate	$ 20,900
Consideration received	$ 15,000
Morgantown Commons [Member]
Business Acquisition [Line Items]
Impairment of real estate			$ 8,500
Consideration received					$ 6,700
Non-core Properties [Member]
Business Acquisition [Line Items]
Impairment of real estate				$ 21,900

Investment In Unconsolidated _3

Investment In Unconsolidated Entities, at Equity - Narrative (Details) $ in Thousands	Mar. 30, 2017USD ($)	Mar. 29, 2017USD ($)	Dec. 31, 2018USD ($)ft²property	Dec. 31, 2017USD ($)property	Dec. 31, 2016USD ($)	May 12, 2017property	May 10, 2017	Mar. 02, 2017USD ($)ft²
Schedule of Equity Method Investments [Line Items]
Notes payable			$ 982,697	$ 979,372
Distributions of income from unconsolidated entities			$ 8,619	$ 1,873	$ 804
O'Connor Joint Venture [Member] | Pearlridge Uptown II [Member]
Schedule of Equity Method Investments [Line Items]
Area of real estate property | ft²								153,000
Purchase price								$ 70,000
O'Connor Joint Venture II [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage				51.00%
Number of real estate properties | property				7		6
Adjusted purchase price before closing adjustments and debt assumption				$ 598,600
Proceeds from real estate and joint venture				138,900
Gain (loss) on disposition of assets				126,100
Formation of joint venture, transaction costs				$ 6,400
O'Connor Joint Venture II [Member] | O'Connor Mall Partners LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage				49.00%			49.00%
The Seminole Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage			45.00%
Effective financial interest			6.76%
Distributions of income from unconsolidated entities				$ 700
The Seminole Joint Venture [Member] | Seminole Town Center [Member]
Schedule of Equity Method Investments [Line Items]
Area of real estate property | ft²			1,100,000
Other Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage			12.50%
O'Connor Joint Venture I and O'Connor Joint Venture II [Member]
Schedule of Equity Method Investments [Line Items]
Advances and excess investment			$ 5,200	$ 4,300
Advances to affiliate, anticipated repayment term			1 year
O'Connor Mall Partners LP [Member] | O'Connor Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage			51.00%
Number of real estate properties | property			5
O'Connor Mall Partners LP [Member] | O'Connor Joint Venture [Member] | Pearlridge Uptown II [Member] | Non-recourse Mortgage Note Payable [Member]
Schedule of Equity Method Investments [Line Items]
Notes payable	$ 43,200
Debt instrument term	8 years
Stated interest rate	4.071%
O'Connor Mall Partners LP [Member] | O'Connor Joint Venture [Member] | Scottsdale Quarter, Block K and Block M [Member] | Non-recourse Mortgage Note Payable [Member]
Schedule of Equity Method Investments [Line Items]
Notes payable		$ 55,000
Debt instrument term		10 years
Stated interest rate		4.36%

Investment In Unconsolidated _4

Investment In Unconsolidated Entities, at Equity - Combined Statements of Operations for the Unconsolidated Joint Venture Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Total revenues	$ 264,521	$ 236,415	$ 191,831
Operating expenses	108,513	95,603	78,685
Depreciation and amortization	97,810	89,397	78,972
Operating income	58,198	51,415	34,174
Gain on sale of interests in property and unconsolidated entities, net	583	1,585	1,014
Interest expense, taxes, and other, net	(52,477)	(45,906)	(32,754)
Net income from the Company's unconsolidated real estate entities	6,304	7,094	2,434
Our share of income (loss) from the Company's unconsolidated real estate entities	$ 541	$ 1,395	$ (1,745)

Investment In Unconsolidated _5

Investment In Unconsolidated Entities, at Equity - Combined Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liabilities and Members’ Equity:
Our share of members’ equity, net	$ 433,207	$ 451,839
Acquired in place and above market leases	91,609	107,869
Below market lease, net	57,392	69,269
O'Connor Joint Venture I, O'Connor Joint Venture II, the Seminole Joint Venture, and Other Interests [Member]
Assets:
Investment properties at cost, net	1,964,699	1,972,208
Construction in progress	21,019	44,817
Cash and cash equivalents	43,169	40,955
Tenant receivables and accrued revenue, net	31,661	30,866
Deferred costs and other assets	147,481	174,665
Total assets	2,208,029	2,263,511
Liabilities and Members’ Equity:
Mortgage notes payable	1,292,801	1,302,143
Accounts payable, accrued expenses, intangibles, and deferred revenues	137,073	148,273
Total liabilities	1,429,874	1,450,416
Members’ equity	778,155	813,095
Total liabilities and members’ equity	2,208,029	2,263,511
Our share of members’ equity, net	$ 396,229	$ 414,245

Investment In Unconsolidated _6

Investment In Unconsolidated Entities, at Equity - Investments In and Advances to Unconsolidated Real Estate Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Our share of members’ equity, net	$ 433,207	$ 451,839
Cash distributions and losses in unconsolidated entities, at equity	15,421	15,421
Joint Venture Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Our share of members’ equity, net	396,229	414,245
Advances and excess investment	21,557	22,173
Net investment in and advances to unconsolidated entities, at equity	$ 417,786	$ 436,418

Indebtedness - Mortgage Debt (D

Indebtedness - Mortgage Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Face amount of mortgage loans	$ 2,960,276
Fair value adjustments, net	(9,680)
Debt issuance cost, net	(18,883)
Carrying value of debt	$ 983,269	$ 1,157,082
Weighted average interest rate	5.00%	4.77%
Mortgages [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans	$ 980,276	$ 1,152,436
Fair value adjustments, net	5,764	8,338
Debt issuance cost, net	(2,771)	(3,692)
Carrying value of debt	$ 983,269	$ 1,157,082
Debt instrument term	3 years 183 days	4 years

Indebtedness - Roll Forward of

Indebtedness - Roll Forward of Mortgage Indebtedness (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Mortgage Debt [Roll Forward]
Balance at December 31, 2017	$ 1,157,082
Balance at December 31, 2018	983,269
Mortgages [Member]
Mortgage Debt [Roll Forward]
Balance at December 31, 2017	1,157,082
Debt amortization payments	(18,322)
Repayment of debt	(94,838)
Debt borrowings, net of issuance costs	34,782
Debt canceled upon lender foreclosures, net of debt issuance costs	(93,988)
Amortization of fair value and other adjustments	(2,574)
Amortization of debt issuance costs	1,127
Balance at December 31, 2018	$ 983,269

Indebtedness - Mortgage Narrati

Indebtedness - Mortgage Narrative (Details)

Oct. 02, 2018USD ($)

Sep. 27, 2018USD ($)extension

Jun. 08, 2018USD ($)

Jun. 08, 2018USD ($)extension

Jun. 08, 2018USD ($)extension_option

Jan. 19, 2018USD ($)

Dec. 29, 2017USD ($)

Oct. 17, 2017USD ($)

Oct. 03, 2017USD ($)

Oct. 02, 2017USD ($)

Apr. 25, 2017USD ($)

Oct. 23, 2018USD ($)

May 29, 2018USD ($)

Dec. 31, 2017

May 10, 2017

Mortgage Loan Secured by Rushmore Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 94,000,000

$ 94,000,000

Term Loan Secured by Weberstown Mall [Member]

Debt Instrument [Line Items]

Debt face amount

$ 65,000,000

$ 65,000,000

$ 65,000,000

Debt instrument number of extension options

2

3

Debt instrument period of extension option

1 year

Mortgage Loan Secured by Southern Hills Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 55,000,000

Mortgage Loan Secured by Valle Vista Mall [Member]

Debt Instrument [Line Items]

Debt canceled upon lender foreclosures

$ 40,000,000

Mortgage Loan Secured by Mesa Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 63,000,000

Debt canceled upon lender foreclosures

$ 87,300,000

Affiliate [Member] | Whitehall Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 8,300,000

Affiliate [Member] | Secured by Southgate Mall [Member]

Debt Instrument [Line Items]

Debt face amount

$ 35,000,000

Debt instrument term

3 years

Stated interest rate

4.48%

Debt instrument number of extension options | extension

2

Debt instrument period of extension option

1 year

Affiliate [Member] | Mortage Loan on The Outlet Collection Seattle [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 86,500,000

Affiliate [Member] | Mortgage Loan Secured by Henderson Square [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 11,700,000

Affiliate [Member] | Mortgage Loan Secured by Southern Hills Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

55,000,000

Debt canceled upon lender foreclosures

$ 99,700,000

Affiliate [Member] | Mortgage Loan on West Shore Plaza [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 99,600,000

O'Connor Joint Venture II [Member]

Debt Instrument [Line Items]

Ownership percentage

51.00%

O'Connor Joint Venture II [Member] | O'Connor Mall Partners LP [Member]

Debt Instrument [Line Items]

Ownership percentage

49.00%

49.00%

Indebtedness - Summary of Non-r

Indebtedness - Summary of Non-recourse Mortgage Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	May 10, 2017
Debt Instrument [Line Items]
Principal	$ 2,960,276
Debt issuance cost, net	(18,883)
Net debt issuance	$ 983,269	$ 1,157,082
Non-recourse Mortgage Loans [Member]
Debt Instrument [Line Items]
Principal			$ 215,179
Debt issuance cost, net			(1,588)
Net debt issuance			213,591
Non-recourse Mortgage Loans [Member] | The Arboretum [Member]
Debt Instrument [Line Items]
Principal			59,400
Debt issuance cost, net			(452)
Net debt issuance			$ 58,948
Interest Rate			4.13%
Non-recourse Mortgage Loans [Member] | Gateway Centers [Member]
Debt Instrument [Line Items]
Principal			$ 112,500
Debt issuance cost, net			(709)
Net debt issuance			$ 111,791
Interest Rate			4.03%
Non-recourse Mortgage Loans [Member] | Oklahoma City Properties [Member]
Debt Instrument [Line Items]
Principal			$ 43,279
Debt issuance cost, net			(427)
Net debt issuance			$ 42,852
Interest Rate			3.90%

Indebtedness - Unsecured Debt N

Indebtedness - Unsecured Debt Narrative (Details) - USD ($)	Jan. 22, 2018	Aug. 04, 2017	Dec. 31, 2017
Unsecured Debt [Member] | June 2015 Term Loan [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 270,000,000		$ 230,000,000
Washington Prime Group, L.P. [Member]
Debt Instrument [Line Items]
Repayments of debt		$ 500,000,000
Washington Prime Group, L.P. [Member] | Amended Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,000,000,000
Potential increase	1,500,000,000
Washington Prime Group, L.P. [Member] | June 2015 Term Loan and Revolver [Member]
Debt Instrument [Line Items]
Repayments of debt	270,000,000
Washington Prime Group, L.P. [Member] | Unsecured Term Loans [Member] | Amended Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	350,000,000
Washington Prime Group, L.P. [Member] | Unsecured Debt [Member] | 5.950% Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt face amount		$ 750,000,000
Revolving credit facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 650,000,000		$ 900,000,000

Indebtedness - Unsecured Debt O

Indebtedness - Unsecured Debt Outstanding (Details)	Jan. 22, 2018USD ($)extension	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	May 09, 2018USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Face amount of mortgage loans			$ 2,960,276,000
Debt discount, net			(9,680,000)
Debt issuance cost, net			(18,883,000)
Carrying value of debt			983,269,000	$ 1,157,082,000
Notes payable [Member]
Debt Instrument [Line Items]
Debt discount, net			(9,680,000)	(11,086,000)
Debt issuance cost, net			(7,623,000)	(9,542,000)
Carrying value of debt			982,697,000	979,372,000
Notes payable [Member] | 3.850% Exchange Notes [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			$ 250,000,000	250,000,000
Stated interest rate			3.85%
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages			0.028%
Notes payable [Member] | 5.950% Notes Due 2024 [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			$ 750,000,000	750,000,000
Stated interest rate			5.95%
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages			1.533%
Unsecured term loans [Member]
Debt Instrument [Line Items]
Debt issuance cost, net			$ (4,491,000)	(3,305,000)
Carrying value of debt			$ 685,509,000	606,695,000
Unsecured term loans [Member] | 3.850% Exchange Notes [Member]
Debt Instrument [Line Items]
Stated interest rate			3.85%
Unsecured term loans [Member] | 5.950% Notes Due 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate			5.95%
Unsecured term loans [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			$ 350,000,000	0
Notional amount		$ 270,000,000			$ 250,000,000
Derivative fixed interest rate		2.56%			4.21%
Effective interest rate			3.95%
Unsecured term loans [Member] | December 2015 Term Loan [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			$ 340,000,000	340,000,000
Notional amount			$ 340,000,000
Derivative fixed interest rate			3.51%
Unsecured term loans [Member] | June 2015 Term Loan [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			$ 0	270,000,000
Repayments of debt	$ 270,000,000			230,000,000
Write off of deferred debt issuance cost	500,000			900,000
Revolving credit facility [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			290,000,000	155,000,000
Debt issuance cost, net			(3,998,000)	(540,000)
Carrying value of debt			$ 286,002,000	154,460,000
Effective interest rate			3.75%
Write off of deferred debt issuance cost	300,000
Maximum borrowing capacity	$ 650,000,000			900,000,000
Debt instrument number of extension options | extension	2
Debt instrument period of extension option	6 months
Remaining borrowing capacity			$ 359,800,000
Revolving credit facility [Member] | Facility [Member]
Debt Instrument [Line Items]
Face amount of mortgage loans			290,000,000	$ 155,000,000		$ 308,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity			$ 200,000
London Interbank Offered Rate (LIBOR) [Member] | Unsecured term loans [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.45%	1.45%
London Interbank Offered Rate (LIBOR) [Member] | Unsecured term loans [Member] | December 2015 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.80%
London Interbank Offered Rate (LIBOR) [Member] | Unsecured term loans [Member] | June 2015 Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.45%
London Interbank Offered Rate (LIBOR) [Member] | Revolving credit facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.25%	1.25%

Indebtedness - Borrowing and Pa

Indebtedness - Borrowing and Paydowns on Revolver (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt [Roll Forward]
Paydowns	$ (588,182)	$ (1,486,781)	$ (202,939)
Ending Balance	2,960,276
Revolving credit facility [Member]
Debt [Roll Forward]
Beginning Balance	155,000
Ending Balance	290,000	155,000
Revolving credit facility [Member] | Facility [Member]
Debt [Roll Forward]
Beginning Balance	155,000	308,000
Borrowings	332,000	350,000
Paydowns	(197,000)	(503,000)
Ending Balance	$ 290,000	$ 155,000	$ 308,000

Indebtedness - Covenants (Detai

Indebtedness - Covenants (Details) $ in Thousands

Oct. 17, 2017USD ($)

Apr. 25, 2017USD ($)

Dec. 31, 2018USD ($)propertypoolloanquarter

Nov. 19, 2018USD ($)

Oct. 23, 2018USD ($)

May 29, 2018USD ($)

Apr. 11, 2018USD ($)

Dec. 31, 2017USD ($)

Mar. 30, 2017USD ($)

Aug. 08, 2016USD ($)

Jun. 30, 2016USD ($)

Jun. 06, 2016USD ($)

May 25, 2016

Oct. 30, 2015USD ($)

Oct. 08, 2015USD ($)

Debt Instrument [Line Items]

Mortgage notes payable

$ 983,269

$ 1,157,082

West Ridge Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 49,900

Mortgage Loan Secured by Rushmore Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 94,000

$ 94,000

Mortgage Loan Secured by Towne West Square [Member]

Debt Instrument [Line Items]

Default amount

$ 45,200

Mortgage Loan Secured by Southern Hills Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 55,000

Mortgage Loan Secured by Mesa Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 63,000

Mortgages [Member]

Debt Instrument [Line Items]

Mortgage notes payable

983,269

$ 1,157,082

Repayments of debt

$ 94,838

Secured Debt [Member]

Debt Instrument [Line Items]

Number of loans | loan

21

Number f full-recourse loans | loan

2

Collateral properties | property

26

Separate pool of cross-defaulted and cross-collateralized mortgages | pool

1

Properties encumbered | property

4

Consecutive quarters for which cash levels should attain the benchmark | quarter

2

Consolidated Subsidiary of the Company [Member]

Debt Instrument [Line Items]

Ownership percentage, noncontrolling interest

100.00%

Consolidated Subsidiary of the Company [Member] | Mortgage Loan Secured by Valle Vista Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 40,000

Consolidated Subsidiary of the Company [Member] | Mortgage Loan Secured by Southern Hills Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 99,700

Consolidated Subsidiary of the Company [Member] | Mortgage Loan Secured by Mesa Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 87,300

Consolidated Subsidiary of the Company [Member] | Mortgage Loan Secured by River Valley Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 44,900

Consolidated Subsidiary of the Company [Member] | Mortgage Loan Secured by Merritt Square Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 52,900

Consolidated Subsidiary of the Company [Member] | Mortgage Loan Secured by Chesapeake Square Mall [Member]

Debt Instrument [Line Items]

Default amount

$ 62,400

Affiliate [Member] | Mortgage Loan Secured by Southern Hills Mall [Member]

Debt Instrument [Line Items]

Repayments of debt

$ 55,000

Indebtedness - Gain on Extingui

Indebtedness - Gain on Extinguishment of Debt, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Gain on extinguishment of debt, net	$ 51,395	$ 90,579	$ 34,612
Mortgage Loan Secured by Rushmore Mall [Member]
Extinguishment of Debt [Line Items]
Gain on extinguishment of debt, net	51,400
Debt forgiveness	$ 94,000
Secured by Valle Vista, Southern Hills and Mesa Mall [Member]
Extinguishment of Debt [Line Items]
Gain on extinguishment of debt, net		90,600
Debt forgiveness		$ 108,900
Secured by River Valley Mall, Merritt Square Mall, and Chesapeake Square [Member]
Extinguishment of Debt [Line Items]
Gain on extinguishment of debt, net			34,600
Debt forgiveness			$ 160,100

Indebtedness - Principal Repaym

Indebtedness - Principal Repayments on Indebtedness (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
2,019	$ 64,281
2,020	344,584
2,021	320,513
2,022	771,856
2,023	404,121
Thereafter	1,054,921
Total principal maturities	2,960,276
Bond Discount	(9,680)
Fair value adjustments, net	5,764
Debt issuance cost, net	(18,883)
Carrying value of debt	983,269	$ 1,157,082
Interest paid	141,641	$ 107,609	$ 125,999
Mortgages and Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 2,937,477

Indebtedness - Fair Value of De

Indebtedness - Fair Value of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Book value of fixed- rate mortgages	$ 983,269	$ 1,157,082
Fixed Rate Mortgages [Member]
Debt Instrument [Line Items]
Book value of fixed- rate mortgages	915,276	1,000,936
Fair value of fixed-rate mortgages	928,129	1,024,890
Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]
Book value of fixed- rate mortgages	1,590,000	1,610,000
Fair value of fixed-rate mortgages	$ 1,485,672	$ 1,616,810
Weighted Average [Member] | Fixed Rate Mortgages [Member]
Debt Instrument [Line Items]
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages	4.57%	4.19%
Weighted Average [Member] | Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages	5.62%	4.27%

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) $ in Thousands	May 09, 2018USD ($)derivative	May 08, 2018USD ($)derivative	Aug. 04, 2017USD ($)derivative	Dec. 31, 2018USD ($)derivative	Dec. 31, 2017USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge to be reclassified within 12 months | $				$ 2,400
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives terminated | derivative			6
Partially terminated derivatives | derivative			1
Terminated amount of terminated derivative | $			$ 430,000
Proceeds from derivatives | $			$ 2,000
Derivatives entered into | derivative	4
Term of derivative	3 years
Notional amount | $	$ 250,000	$ 270,000		$ 590,000
Derivatives replaced | derivative		2
Derivative replacement term		3 years
Number of derivatives held | derivative				10
Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member] | Interest rate products [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of interest rate derivatives | $				$ 1,913	$ 0

Equity - Narrative (Details)

Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 21, 2017	Jan. 15, 2015	Feb. 28, 2018	Feb. 28, 2017	Oct. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance (in shares)						34,755,660
Vesting period						3 years
Grants in period (in shares)						0
Grants in period, weighted average grant date fair value (usd per share)						$ 0		$ 0.62
Aggregate intrinsic value of options exercised						$ 0
Aggregate fair value of options vested						$ 154
Common stock dividends declared (usd per share)						$ 1	$ 1
Inducement LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized						$ 38
Compensation not yet recognized, period for recognition						73 days
Units vested (in shares)						25,036	29,685	189,755
Units vested (in dollars per share)						$ 17.97	$ 18.33	$ 18.07
Units granted (in shares)						0	0	0
Units granted (in dollars per share)						$ 0
Performance Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance LTIP Units available to be earned with respect to each performance period based on achievement of absolute TSR goals									40.00%
Performance LTIP Units available to be earned with respect to each performance period based on achievement of relative TSR goals									60.00%
Performance Long-Term Incentive Plan Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards earned based on achievement of TSR goals									0.00%
Performance Long-Term Incentive Plan Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards earned based on achievement of TSR goals									100.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized						$ 6,600
Compensation not yet recognized, period for recognition						1 year 183 days
Units granted (in shares)						812,440
Fair value of awards vested in period						$ 3,320	$ 1,128	$ 1,082
Restricted stock awards (in shares)						812,440	843,435	518,112
Units granted (in dollars per share)						$ 6.28	$ 8.07	$ 11.48
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards (in shares)			587,000	682,435	284,483
Restricted stock awards, value			$ 3,600	$ 5,600	$ 3,300
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized						$ 33
Compensation not yet recognized, period for recognition						120 days
Units granted (in shares)						0
Aggregate intrinsic value, vested awards						$ 44
Fair value of awards vested in period						$ 391	$ 2,182	$ 14,115
Units granted (in dollars per share)						$ 0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights rate						33.30%
Grants in period (in shares)								247,500
Grants in period, weighted average grant date fair value (usd per share)								$ 0.62
Aggregate intrinsic value of options exercised							12	$ 163
Aggregate fair value of options vested							$ 187	$ 191
Washington Prime Group, L.P. 2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of authorized shares (in shares)										10,000,000
Number of shares annually available for grant per participant (in shares)										500,000
Washington Prime Group, L.P. 2014 Stock Incentive Plan [Member] | Inducement LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						4 years
Washington Prime Group, L.P. 2014 Stock Incentive Plan [Member] | Performance Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)									304,818
The 2017 Annual Long-term Incentive Awards [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Units granted (in shares)	358,198
Contingent right (in shares)	1
Units granted (in dollars per share)	$ 9.58
The 2017 Annual Long-term Incentive Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Units granted (in shares)	358,198
Units granted (in dollars per share)	$ 7.72
The 2017 Annual Long-term Incentive Awards [Member] | Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards earned based on achievement of TSR goals						0.00%
The 2017 Annual Long-term Incentive Awards [Member] | Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards earned based on achievement of TSR goals						150.00%
The 2016 Annual Long-term Incentive Awards [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)							324,237
Grant date fair value							$ 2,200
The 2016 Annual Long-term Incentive Awards [Member] | Long Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance LTIP Units available to be earned with respect to each performance period based on achievement of absolute TSR goals								50.00%
Minimum employee subscription rate								30.00%
Maximum employee subscription rate								100.00%
Base salary range								15 days
Payout for allocated RSUs was based on the Company's performance on the strategic goals								50.00%
Payout for TSR performance were achieved at target							100.00%
The 2015 Annual Long-Term Incentive Awards [Member] | Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights rate						33.33%
The 2015 Annual Long-Term Incentive Awards [Member] | Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights rate						33.33%
The 2015 Annual Long-Term Incentive Awards [Member] | Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights rate						33.33%
The 2015 Annual Long-Term Incentive Awards [Member] | Long Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)								323,417
Minimum employee subscription rate									30.00%
Maximum employee subscription rate									300.00%
Base salary range									15 days
Payout for allocated RSUs was based on the Company's performance on the strategic goals									40.00%
Payout for allocated Units was based on the Company's performance on the strategic goals									40.00%
Ratio for Company's TSR performance									60.00%
The 2015 Annual Long-Term Incentive Awards [Member] | Long Term Incentive Plan Units [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vested (in shares)								94,106
The 2015 Annual Long-Term Incentive Awards [Member] | Long Term Incentive Plan Units [Member] | Certain Former Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vested (in shares)								121,193
The 2015 Annual Long-Term Incentive Awards [Member] | Long Term Incentive Plan Units [Member] | Vesting in Three Installments [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)								108,118
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)							314,577
Series H Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred shares, shares issued (in shares)						4,000,000	4,000,000
Series I Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred shares, shares issued (in shares)						3,800,000	3,800,000
Glimcher Realty Trust [Member] | Series H Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred shares, shares issued (in shares)		4,000,000
Preferred stock dividend rate		7.50%
Redemption price (usd per share)		$ 25
Glimcher Realty Trust [Member] | Series I Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred shares, shares issued (in shares)		3,800,000
Preferred stock dividend rate		6.875%
Redemption price (usd per share)		$ 25

Rentals Under Operating Lease_2

Rentals Under Operating Leases - Future Minimum Rentals (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2,019	$ 401,604
2,020	336,602
2,021	270,936
2,022	222,569
2,023	175,206
Thereafter	423,765
Operating leases, future minimum payments receivable	$ 1,830,682

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Details) - Interest rate products [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred costs and other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 9,306	$ 7,413
Accounts payable, accrued expenses, intangibles and deferred revenues [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1,913	$ 0

Equity - Inducement LTIP Units

Equity - Inducement LTIP Units (Details) - Inducement LTIP Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance outstanding (in shares)	37,868
Units granted (in shares)	0	0	0
Units vested (in shares)	(25,036)	(29,685)	(189,755)
Units forfeited (in shares)	0
Balance outstanding (in shares)	12,832	37,868
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding weighted average grant date fair value (in dollars per share)	$ 17.82
Units granted (in dollars per share)	0
Units vested (in dollars per share)	17.97	$ 18.33	$ 18.07
Units forfeited (in dollars per share)	0
Outstanding weighted average grant date fair value (in dollars per share)	$ 17.53	$ 17.82

Derivative Financial Instrume_5

Derivative Financial Instruments - Effect of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Total interest (expense) presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded	$ (141,987)	$ (126,541)	$ (136,225)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total interest (expense) presented in the consolidated statements of operations in which the effects of cash flow hedges are recorded	(141,987)	(126,541)	(136,225)
Interest rate products [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative	1,054	1,256	(3,580)
Interest rate products [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from AOCI into Income	$ (2,338)	$ 1,145	$ 7,381

Equity - Assumptions Used to Va

Equity - Assumptions Used to Value Grants (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free rate			1.40%
Annual LTIP Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share of Awards (in dollars per share)			$ 3.81	$ 7.07
Total amount to be recognized over the performance period			$ 2,516	$ 4,656
Risk free rate			0.44%	0.20%
Volatility			31.40%	22.66%
Dividend yield			10.05%	6.03%
The 2018 Annual Long-term Incentive Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free rate	2.39%
Volatility	24.70%
Dividend yield	16.39%
The 2017 Annual Long-term Incentive Awards [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free rate		1.49%
Volatility		20.52%
Dividend yield		10.44%

Derivative Financial Instrume_6

Derivative Financial Instruments - Liabilities Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative instruments, net	$ 7,393	$ 7,413
Quoted Prices in Active Markets for Identical Liabilities (Level 1) [Member]
Derivative [Line Items]
Derivative instruments, net	0	0
Significant Other Observable Inputs (Level 2) [Member]
Derivative [Line Items]
Derivative instruments, net	7,393	7,413
Significant Unobservable Inputs (Level 3) [Member]
Derivative [Line Items]
Derivative instruments, net	$ 0	$ 0

Equity - Summary of Annual Long

Equity - Summary of Annual Long-term Incentive Awards (Details) - $ / shares	Feb. 20, 2018	Feb. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)			812,440
Grant date fair value (in dollars per share)			$ 6.28	$ 8.07	$ 11.48
Restricted Stock Units (RSUs) [Member] | The 2018 Annual Long-term Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	587,000
Grant date fair value (in dollars per share)	$ 6.10
Restricted Stock Units (RSUs) [Member] | The 2017 Annual Long-term Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)		358,198
Grant date fair value (in dollars per share)		$ 9.58
Performance Shares [Member] | The 2018 Annual Long-term Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	587,000
Grant date fair value (in dollars per share)	$ 4.88
Performance Shares [Member] | The 2017 Annual Long-term Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)		358,198
Grant date fair value (in dollars per share)		$ 7.72

Equity - Restricted Share Activ

Equity - Restricted Share Activity (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance outstanding (in shares) | shares	30,535
Units granted (in shares) | shares	0
Shares vested/forfeited (in shares) | shares	(21,502)
Balance outstanding (in shares) | shares	9,033
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.18
Units granted (in dollars per share) | $ / shares	0
Shares vested/forfeited (in dollars per share) | $ / shares	18.18
Outstanding weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.18

Equity - Restricted Stock Unit

Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance outstanding (in shares)	1,157,576
Units granted (in shares)	812,440
Shares vested/forfeited (in shares)	(400,703)
Balance outstanding (in shares)	1,569,313	1,157,576
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding weighted average grant date fair value (in dollars per share)	$ 9.40
Units granted (in dollars per share)	6.28	$ 8.07	$ 11.48
RSUs vested/forfeited (in dollars per share)	8.29
Outstanding weighted average grant date fair value (in dollars per share)	$ 8.07	$ 9.40

Equity - Stock Option Activity

Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year (in shares)	794,014
Grants in period (in shares)	0
Options exercised (in shares)	0
Options forfeited/expired (in shares)	(114,273)
Outstanding at end of year (in shares)	679,741
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of year (in dollars per share)	$ 2.26
Grants in period, weighted average grant date fair value (usd per share)	0	$ 0.62
Options exercised (in dollars per share)	0
Options forfeited/expired (in dollars per share)	3.36
Outstanding at end of year (in dollars per share)	$ 2.08

Equity - Fair Value Assumptions

Equity - Fair Value Assumptions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Equity [Abstract]
Weighted average per share value of options granted/converted (usd per share)	$ 0	$ 0.62
Weighted average risk free rates		1.40%
Expected average lives in years		6 years
Annual dividend rates (usd per share)		$ 1
Weighted average volatility		28.30%
Forfeiture rate		10.00%

Equity - Summary of Options Out

Equity - Summary of Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding (in shares) | shares	679,741
Weighted Average Remaining Contractual Life	5 years 219 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 12.96
Number of Options Exercisable (in shares) | shares	623,904
Weighted Average Remaining Contractual Life	5 years 146 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 13.23
$1.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 1.79
Number of Options Outstanding (in shares) | shares	2,348
Weighted Average Remaining Contractual Life	73 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 1.79
Number of Options Exercisable (in shares) | shares	2,348
Weighted Average Remaining Contractual Life	73 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 1.79
$5.76 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 5.76
Number of Options Outstanding (in shares) | shares	14,758
Weighted Average Remaining Contractual Life	1 year 73 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 5.76
Number of Options Exercisable (in shares) | shares	14,758
Weighted Average Remaining Contractual Life	1 year 73 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 5.76
$11.97 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 11.97
Number of Options Outstanding (in shares) | shares	36,267
Weighted Average Remaining Contractual Life	2 years 110 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 11.97
Number of Options Exercisable (in shares) | shares	36,267
Weighted Average Remaining Contractual Life	2 years 110 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 11.97
$12.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 12.67
Number of Options Outstanding (in shares) | shares	55,419
Weighted Average Remaining Contractual Life	3 years 146 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 12.67
Number of Options Exercisable (in shares) | shares	55,419
Weighted Average Remaining Contractual Life	3 years 146 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 12.67
$16.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 16.56
Number of Options Outstanding (in shares) | shares	105,381
Weighted Average Remaining Contractual Life	4 years 146 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 16.56
Number of Options Exercisable (in shares) | shares	105,381
Weighted Average Remaining Contractual Life	4 years 146 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 16.56
$13.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 13.10
Number of Options Outstanding (in shares) | shares	72,068
Weighted Average Remaining Contractual Life	5 years 110 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 13.10
Number of Options Exercisable (in shares) | shares	72,068
Weighted Average Remaining Contractual Life	5 years 110 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 13.10
$14.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 14.28
Number of Options Outstanding (in shares) | shares	226,000
Weighted Average Remaining Contractual Life	6 years 146 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 14.28
Number of Options Exercisable (in shares) | shares	226,000
Weighted Average Remaining Contractual Life	6 years 146 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 14.28
$9.95 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (in dollars per share)	$ 9.95
Number of Options Outstanding (in shares) | shares	167,500
Weighted Average Remaining Contractual Life	7 years 146 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 9.95
Number of Options Exercisable (in shares) | shares	111,663
Weighted Average Remaining Contractual Life	7 years 146 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 9.95

Equity - Aggregate Intrinsic Va

Equity - Aggregate Intrinsic Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Equity [Abstract]
Aggregate intrinsic value of options outstanding	$ 7
Aggregate intrinsic value of options exercisable	7
Aggregate intrinsic value of options exercised	0
Aggregate fair value of options vested	$ 154

Equity - LTIP and the WPG Restr

Equity - LTIP and the WPG Restricted Shares Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense	$ 8.3	$ 6.4	$ 14.1
Merger, restructuring and transaction costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense	0	0	9.5
General and administrative and property operating [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense	$ 8.3	$ 6.4	$ 4.6

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)lease	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Concentration Risk [Line Items]
Number of ground leases	4
Ground rent | $	$ 789	$ 2,438	$ 4,318
Number of material office leases	2
Number of material garage leases	1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk	5.00%
General and Administrative Expense [Member]
Concentration Risk [Line Items]
Ground rent | $	$ 2,668	$ 2,397	$ 2,160

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Property Subject to or Available for Operating Lease [Line Items]
Operating Leases, Future Minimum Payments Due	$ 31,100
Ground [Member]
Property Subject to or Available for Operating Lease [Line Items]
2,019	2,029
2,020	2,049
2,021	2,069
2,022	2,099
2,023	1,427
Thereafter	21,377
Operating Leases, Future Minimum Payments Due	$ 31,050

Related Party Transactions - Ch

Related Party Transactions - Charges for Properties, Consolidated and Unconsolidated (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Amounts charged to related party	$ 0	$ 0
Property management and common costs, services and other [Member] | Consolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			$ 8,791,000
Property management and common costs, services and other [Member] | Unconsolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			196,000
Insurance premiums [Member] | Consolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			0
Insurance premiums [Member] | Unconsolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			0
Advertising and promotional programs [Member] | Consolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			102,000
Advertising and promotional programs [Member] | Unconsolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			6,000
Capitalized leasing and development fees [Member] | Consolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			3,166,000
Capitalized leasing and development fees [Member] | Unconsolidated Properties [Member] | Simon Property Group, Inc. [Member]
Related Party Transaction [Line Items]
Amounts charged to related party			$ 23,000

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Former Member of Board [Member] | Consulting Agreement [Member]
Related Party Transaction [Line Items]
Related party transaction amount	$ 0.2

Earnings Per Common Share_Uni_2

Earnings Per Common Share/Unit - Basic and Diluted Earnings Per Share Per Unit (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
Earnings (Loss) Per Common Share, Basic:
Net income attributable to common shareholders - basic	$ 55,007	$ 463	$ 10,086	$ 14,016	$ 50,165	$ (11,903)	$ 135,467	$ 9,302	$ 79,572	$ 183,031	$ 53,099
Weighted average common shares outstanding - basic (shares)									187,696,339	186,829,385	185,633,582
Earnings (loss) per common share, basic (usd per share)					$ 0.27	$ (0.06)	$ 0.73	$ 0.05	$ 0.42	$ 0.98	$ 0.29
Earnings (Loss) Per Common Share, Diluted:
Net income attributable to common shareholders - basic	$ 55,007	$ 463	$ 10,086	$ 14,016	$ 50,165	$ (11,903)	$ 135,467	$ 9,302	$ 79,572	$ 183,031	$ 53,099
Net income attributable to common shareholders - basic									14,735	34,222	10,034
Net income attributable to common shareholders - diluted									$ 94,307	$ 217,253	$ 63,133
Weighted average common shares outstanding - basic (shares)									187,696,339	186,829,385	185,633,582
Weighted average operating partnership units outstanding (shares)									34,703,770	34,808,890	34,304,109
Weighted average additional dilutive securities outstanding (shares)									603,674	337,508	803,805
Weighted average common shares outstanding - diluted (shares)									223,003,783	221,975,783	220,741,496
Earnings per common share, diluted (in dollars per share)					$ 0.27	$ (0.06)	$ 0.72	$ 0.05	$ 0.42	$ 0.98	$ 0.29

Earnings Per Common Share_Uni_3

Earnings Per Common Share/Unit - Earnings Per Unit (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, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings (Loss) Per Common Unit, Basic & Diluted:
Weighted average common shares outstanding - diluted (shares)					223,003,783	221,975,783	220,741,496
Earnings (loss) per common unit, basic & diluted (usd per unit)	$ 0.29	$ 0	$ 0.05	$ 0.07	$ 0.42	$ 0.98	$ 0.29
Washington Prime Group, L.P. [Member]
Earnings (Loss) Per Common Unit, Basic & Diluted:
Net income attributable to common shareholders - basic					$ 94,307	$ 217,253	$ 63,133
Weighted average common units outstanding - basic (shares)					222,400,109	221,638,275	219,937,691
Weighted average additional dilutive securities outstanding (shares)					603,674	337,508	803,805
Weighted average common shares outstanding - diluted (shares)					223,003,783	221,975,783	220,741,496
Earnings (loss) per common unit, basic & diluted (usd per unit)	$ 0.29	$ 0	$ 0.05	$ 0.07	$ 0.42	$ 0.98	$ 0.29

Subsequent Events (Details)

Subsequent Events (Details) $ / shares in Units, $ in Thousands

Feb. 12, 2019$ / shares

Feb. 11, 2019outparcel

Jan. 18, 2019USD ($)outparcel

Nov. 16, 2018USD ($)outparcel

Oct. 31, 2018USD ($)outparcel

Jul. 27, 2018USD ($)outparcel

Jun. 29, 2018USD ($)outparcel

Jan. 12, 2018USD ($)outparcel

Feb. 21, 2019

Dec. 31, 2018USD ($)outparcel$ / shares

Dec. 31, 2017$ / shares

Feb. 05, 2019USD ($)

Dec. 31, 2016USD ($)

Subsequent Event [Line Items]

Borrowing cost increase impact

$ 8,500

Common stock dividends declared (usd per share) | $ / shares

$ 1

$ 1

Subsequent Event [Member]

Subsequent Event [Line Items]

Proceeds from sale of real estate

$ 12,100

Common stock dividends declared (usd per share) | $ / shares

$ 0.25

Restaurant Outparcels [Member]

Subsequent Event [Line Items]

Parcels sold | outparcel

1

2

2

5

10

20

Proceeds from sale of real estate

$ 3,166

$ 1,714

$ 4,530

$ 9,423

$ 13,506

$ 32,339

Restaurant Outparcels [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Parcels sold | outparcel

1

8

Proceeds from sale of real estate

$ 12,200

Revolving credit facility [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Basis spread

1.65%

Basis spread point increase

0.40%

Term Loan [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Basis spread

1.90%

Basis spread point increase

0.45%

December 2015 Term Loan [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Basis spread

2.35%

Basis spread point increase

0.55%

Notes Due 2024 [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Basis spread point increase

0.50%

Notes Due 2024 [Member] | Notes payable [Member]

Subsequent Event [Line Items]

Stated interest rate

5.95%

Notes Due 2024 [Member] | Notes payable [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Stated interest rate

6.45%

Employee Severance [Member]

Subsequent Event [Line Items]

Restructuring and related cost, expected cost

$ 2,000

Employee Severance [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Restructuring and related cost, expected cost

$ 1,900

Stock Compensation Benefits [Member]

Subsequent Event [Line Items]

Restructuring and related cost, expected cost

$ 500

Stock Compensation Benefits [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Restructuring and related cost, expected cost

$ 100

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) (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
Total revenue	$ 184,321	$ 179,916	$ 178,728	$ 180,340	$ 187,237	$ 179,320	$ 189,171	$ 202,394	$ 723,305	$ 758,122	$ 843,475
Net income (loss)	68,836	4,115	15,519	20,185	63,133	(10,664)	164,500	14,624	108,655	231,593	77,416
Net income attributable to the Company	58,515	3,971	13,594	17,524	53,673	(8,395)	138,975	12,810	93,604	197,063	67,131
Net income attributable to common shareholders	$ 55,007	$ 463	$ 10,086	$ 14,016	$ 50,165	$ (11,903)	$ 135,467	$ 9,302	$ 79,572	$ 183,031	$ 53,099
Earnings (loss) per common share/unit—basic and diluted (in dollars per share)	$ 0.29	$ 0	$ 0.05	$ 0.07					$ 0.42	$ 0.98	$ 0.29
Earnings (loss) per common share—basic (in dollars per share)					$ 0.27	$ (0.06)	$ 0.73	$ 0.05	0.42	0.98	0.29
Earnings (loss) per common share—diluted (in dollars per share)					$ 0.27	$ (0.06)	$ 0.72	$ 0.05	$ 0.42	$ 0.98	$ 0.29
Net income (loss) attributable to unitholders									$ 15,051	$ 34,530	$ 10,285
Washington Prime Group, L.P. [Member]
Total revenue									723,305	758,122	843,475
Net income (loss)									$ 108,655	$ 231,593	$ 77,416
Net income attributable to common shareholders	$ 65,192	$ 547	$ 11,951	$ 16,617	$ 59,497	$ (14,232)	$ 160,932	$ 11,056
Earnings (loss) per common share/unit—basic and diluted (in dollars per share)	$ 0.29	$ 0	$ 0.05	$ 0.07					$ 0.42	$ 0.98	$ 0.29
Earnings (loss) per common share—basic (in dollars per share)					$ 0.27	$ (0.06)	$ 0.73	$ 0.05
Earnings (loss) per common share—diluted (in dollars per share)					$ 0.27	$ (0.06)	$ 0.72	$ 0.05
Net income (loss) attributable to unitholders	$ 68,836	$ 4,115	$ 15,519	$ 20,185	$ 63,133	$ (10,664)	$ 164,500	$ 14,624	$ 76	$ 68	$ 11

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation - Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 980,276
Initial Cost Land	782,921
Initial Cost Buildings and Improvements	3,607,440
Cost Capitalized Subsequent to Construction or Acquisition Land	47,947
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,337,077
Gross Amounts At Which Carried at Close of Period Land	836,214
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	4,980,939
Total cost per Schedule III	5,817,153	$ 5,715,996	$ 6,205,387	$ 6,699,789
Accumulated Depreciation	2,212,476	$ 2,076,948	$ 2,063,107	$ 2,261,593
Malls [Member] | Anderson Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	17,891
Initial Cost Land	1,712
Initial Cost Buildings and Improvements	15,227
Cost Capitalized Subsequent to Construction or Acquisition Land	851
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	19,982
Gross Amounts At Which Carried at Close of Period Land	2,563
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	35,209
Total cost per Schedule III	37,772
Accumulated Depreciation	23,377
Malls [Member] | Ashland Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	36,824
Initial Cost Land	13,462
Initial Cost Buildings and Improvements	68,367
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	5,536
Gross Amounts At Which Carried at Close of Period Land	13,462
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	73,903
Total cost per Schedule III	87,365
Accumulated Depreciation	12,739
Malls [Member] | Bowie Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	2,479
Initial Cost Buildings and Improvements	60,322
Cost Capitalized Subsequent to Construction or Acquisition Land	235
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	9,932
Gross Amounts At Which Carried at Close of Period Land	2,714
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	70,254
Total cost per Schedule III	72,968
Accumulated Depreciation	39,699
Malls [Member] | Boynton Beach Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	22,240
Initial Cost Buildings and Improvements	78,804
Cost Capitalized Subsequent to Construction or Acquisition Land	4,666
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	29,544
Gross Amounts At Which Carried at Close of Period Land	26,906
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	108,348
Total cost per Schedule III	135,254
Accumulated Depreciation	73,264
Malls [Member] | Brunswick Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	71,154
Initial Cost Land	8,436
Initial Cost Buildings and Improvements	55,838
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	35,296
Gross Amounts At Which Carried at Close of Period Land	8,436
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	91,134
Total cost per Schedule III	99,570
Accumulated Depreciation	57,770
Malls [Member] | Charlottesville Fashion Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	46,099
Initial Cost Land	0
Initial Cost Buildings and Improvements	54,738
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	18,814
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	73,552
Total cost per Schedule III	73,552
Accumulated Depreciation	43,711
Malls [Member] | Chautaugua Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	3,116
Initial Cost Buildings and Improvements	9,641
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	19,327
Gross Amounts At Which Carried at Close of Period Land	3,116
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	28,968
Total cost per Schedule III	32,084
Accumulated Depreciation	17,554
Malls [Member] | Chesapeake Square Theater [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	628
Initial Cost Buildings and Improvements	9,536
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	(738)
Gross Amounts At Which Carried at Close of Period Land	628
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	8,798
Total cost per Schedule III	9,426
Accumulated Depreciation	2,162
Malls [Member] | Clay Terrace [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	39,030
Initial Cost Buildings and Improvements	115,207
Cost Capitalized Subsequent to Construction or Acquisition Land	43
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	8,815
Gross Amounts At Which Carried at Close of Period Land	39,073
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	124,022
Total cost per Schedule III	163,095
Accumulated Depreciation	22,408
Malls [Member] | Cottonwood Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	97,203
Initial Cost Land	10,122
Initial Cost Buildings and Improvements	69,958
Cost Capitalized Subsequent to Construction or Acquisition Land	5,042
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	20,239
Gross Amounts At Which Carried at Close of Period Land	15,164
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	90,197
Total cost per Schedule III	105,361
Accumulated Depreciation	49,900
Malls [Member] | Dayton Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	80,421
Initial Cost Land	10,899
Initial Cost Buildings and Improvements	160,723
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,027
Gross Amounts At Which Carried at Close of Period Land	10,899
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	163,750
Total cost per Schedule III	174,649
Accumulated Depreciation	22,388
Malls [Member] | Edison Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	11,529
Initial Cost Buildings and Improvements	107,350
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	34,178
Gross Amounts At Which Carried at Close of Period Land	11,529
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	141,528
Total cost per Schedule III	153,057
Accumulated Depreciation	80,587
Malls [Member] | Georgesville Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	720
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	720
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	0
Total cost per Schedule III	720
Accumulated Depreciation	0
Malls [Member] | Grand Central Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	39,598
Initial Cost Land	18,956
Initial Cost Buildings and Improvements	89,736
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	11,799
Gross Amounts At Which Carried at Close of Period Land	18,956
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	101,535
Total cost per Schedule III	120,491
Accumulated Depreciation	20,627
Malls [Member] | Great Lakes Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	12,302
Initial Cost Buildings and Improvements	100,362
Cost Capitalized Subsequent to Construction or Acquisition Land	98
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	43,683
Gross Amounts At Which Carried at Close of Period Land	12,400
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	144,045
Total cost per Schedule III	156,445
Accumulated Depreciation	80,146
Malls [Member] | Indian Mound Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	7,109
Initial Cost Buildings and Improvements	19,205
Cost Capitalized Subsequent to Construction or Acquisition Land	(252)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,992
Gross Amounts At Which Carried at Close of Period Land	6,857
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	21,197
Total cost per Schedule III	28,054
Accumulated Depreciation	4,369
Malls [Member] | Irving Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	6,737
Initial Cost Buildings and Improvements	17,479
Cost Capitalized Subsequent to Construction or Acquisition Land	2,533
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	44,350
Gross Amounts At Which Carried at Close of Period Land	9,270
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	61,829
Total cost per Schedule III	71,099
Accumulated Depreciation	43,275
Malls [Member] | Jefferson Valley Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	4,868
Initial Cost Buildings and Improvements	30,304
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	70,161
Gross Amounts At Which Carried at Close of Period Land	4,868
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	100,465
Total cost per Schedule III	105,333
Accumulated Depreciation	49,921
Malls [Member] | Lima Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	7,659
Initial Cost Buildings and Improvements	35,338
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	15,950
Gross Amounts At Which Carried at Close of Period Land	7,659
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	51,288
Total cost per Schedule III	58,947
Accumulated Depreciation	32,979
Malls [Member] | Lincolnwood Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	48,662
Initial Cost Land	7,834
Initial Cost Buildings and Improvements	63,480
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	7,684
Gross Amounts At Which Carried at Close of Period Land	7,834
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	71,164
Total cost per Schedule III	78,998
Accumulated Depreciation	56,644
Malls [Member] | Lindale Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	14,106
Initial Cost Buildings and Improvements	58,286
Cost Capitalized Subsequent to Construction or Acquisition Land	(1,096)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	14,083
Gross Amounts At Which Carried at Close of Period Land	13,010
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	72,369
Total cost per Schedule III	85,379
Accumulated Depreciation	23,392
Malls [Member] | Longview Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	259
Initial Cost Buildings and Improvements	3,567
Cost Capitalized Subsequent to Construction or Acquisition Land	3,320
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	22,498
Gross Amounts At Which Carried at Close of Period Land	3,579
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	26,065
Total cost per Schedule III	29,644
Accumulated Depreciation	8,791
Malls [Member] | The Mall at Fairfield Commons [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	18,194
Initial Cost Buildings and Improvements	175,426
Cost Capitalized Subsequent to Construction or Acquisition Land	(411)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	20,928
Gross Amounts At Which Carried at Close of Period Land	17,783
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	196,354
Total cost per Schedule III	214,137
Accumulated Depreciation	30,830
Malls [Member] | Maplewood Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	17,119
Initial Cost Buildings and Improvements	80,758
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	26,707
Gross Amounts At Which Carried at Close of Period Land	17,119
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	107,465
Total cost per Schedule III	124,584
Accumulated Depreciation	52,724
Malls [Member] | Markland Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	7,568
Cost Capitalized Subsequent to Construction or Acquisition Land	3,005
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	28,315
Gross Amounts At Which Carried at Close of Period Land	3,005
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	35,883
Total cost per Schedule III	38,888
Accumulated Depreciation	13,559
Malls [Member] | Melbourne Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	15,762
Initial Cost Buildings and Improvements	55,891
Cost Capitalized Subsequent to Construction or Acquisition Land	4,160
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	40,593
Gross Amounts At Which Carried at Close of Period Land	19,922
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	96,484
Total cost per Schedule III	116,406
Accumulated Depreciation	53,851
Malls [Member] | Mesa Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	12,784
Initial Cost Buildings and Improvements	80,639
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,822
Gross Amounts At Which Carried at Close of Period Land	12,784
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	84,461
Total cost per Schedule III	97,245
Accumulated Depreciation	29,189
Malls [Member] | Morgantown Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	10,219
Initial Cost Buildings and Improvements	77,599
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	2,405
Gross Amounts At Which Carried at Close of Period Land	10,219
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	80,004
Total cost per Schedule III	90,223
Accumulated Depreciation	13,801
Malls [Member] | Muncie Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	33,876
Initial Cost Land	172
Initial Cost Buildings and Improvements	5,776
Cost Capitalized Subsequent to Construction or Acquisition Land	52
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	30,223
Gross Amounts At Which Carried at Close of Period Land	224
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	35,999
Total cost per Schedule III	36,223
Accumulated Depreciation	24,555
Malls [Member] | New Towne Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	3,172
Initial Cost Buildings and Improvements	33,112
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	7,585
Gross Amounts At Which Carried at Close of Period Land	3,172
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	40,697
Total cost per Schedule III	43,869
Accumulated Depreciation	7,961
Malls [Member] | Northtown Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	18,603
Initial Cost Buildings and Improvements	57,341
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	6,881
Gross Amounts At Which Carried at Close of Period Land	18,603
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	64,222
Total cost per Schedule III	82,825
Accumulated Depreciation	12,860
Malls [Member] | Northwoods Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	1,185
Initial Cost Buildings and Improvements	12,779
Cost Capitalized Subsequent to Construction or Acquisition Land	2,689
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	52,009
Gross Amounts At Which Carried at Close of Period Land	3,874
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	64,788
Total cost per Schedule III	68,662
Accumulated Depreciation	39,432
Malls [Member] | Oak Court Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	36,998
Initial Cost Land	15,673
Initial Cost Buildings and Improvements	57,304
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	12,319
Gross Amounts At Which Carried at Close of Period Land	15,673
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	69,623
Total cost per Schedule III	85,296
Accumulated Depreciation	51,384
Malls [Member] | Orange Park Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	12,998
Initial Cost Buildings and Improvements	65,121
Cost Capitalized Subsequent to Construction or Acquisition Land	(267)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	48,997
Gross Amounts At Which Carried at Close of Period Land	12,731
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	114,118
Total cost per Schedule III	126,849
Accumulated Depreciation	71,814
Malls [Member] | The Outlet Collection - Seattle [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	38,751
Initial Cost Buildings and Improvements	107,094
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	13,263
Gross Amounts At Which Carried at Close of Period Land	38,751
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	120,357
Total cost per Schedule III	159,108
Accumulated Depreciation	21,622
Malls [Member] | Paddock Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	11,198
Initial Cost Buildings and Improvements	39,727
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	23,332
Gross Amounts At Which Carried at Close of Period Land	11,198
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	63,059
Total cost per Schedule III	74,257
Accumulated Depreciation	35,797
Malls [Member] | Port Charlotte Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	42,196
Initial Cost Land	5,471
Initial Cost Buildings and Improvements	58,570
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	18,478
Gross Amounts At Which Carried at Close of Period Land	5,471
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	77,048
Total cost per Schedule III	82,519
Accumulated Depreciation	51,342
Malls [Member] | Rolling Oaks Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	1,929
Initial Cost Buildings and Improvements	38,609
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	17,630
Gross Amounts At Which Carried at Close of Period Land	1,929
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	56,239
Total cost per Schedule III	58,168
Accumulated Depreciation	39,023
Malls [Member] | Southern Hills Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	15,025
Initial Cost Buildings and Improvements	75,984
Cost Capitalized Subsequent to Construction or Acquisition Land	4,566
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4,141
Gross Amounts At Which Carried at Close of Period Land	19,591
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	80,125
Total cost per Schedule III	99,716
Accumulated Depreciation	27,806
Malls [Member] | Southern Park Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	16,982
Initial Cost Buildings and Improvements	77,767
Cost Capitalized Subsequent to Construction or Acquisition Land	(236)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	35,745
Gross Amounts At Which Carried at Close of Period Land	16,746
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	113,512
Total cost per Schedule III	130,258
Accumulated Depreciation	69,461
Malls [Member] | Southgate Mall, Missoula, Montana [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	35,000
Initial Cost Land	17,040
Initial Cost Buildings and Improvements	35,896
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	205
Gross Amounts At Which Carried at Close of Period Land	17,040
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	36,101
Total cost per Schedule III	53,141
Accumulated Depreciation	1,204
Malls [Member] | Sunland Park Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	2,896
Initial Cost Buildings and Improvements	28,900
Cost Capitalized Subsequent to Construction or Acquisition Land	(171)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	7,887
Gross Amounts At Which Carried at Close of Period Land	2,725
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	36,787
Total cost per Schedule III	39,512
Accumulated Depreciation	29,040
Malls [Member] | Town Center at Aurora [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	52,250
Initial Cost Land	9,959
Initial Cost Buildings and Improvements	56,832
Cost Capitalized Subsequent to Construction or Acquisition Land	9,974
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	58,923
Gross Amounts At Which Carried at Close of Period Land	19,933
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	115,755
Total cost per Schedule III	135,688
Accumulated Depreciation	81,675
Malls [Member] | Towne West Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	45,205
Initial Cost Land	972
Initial Cost Buildings and Improvements	21,203
Cost Capitalized Subsequent to Construction or Acquisition Land	22
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	11,071
Gross Amounts At Which Carried at Close of Period Land	994
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	32,274
Total cost per Schedule III	33,268
Accumulated Depreciation	24,644
Malls [Member] | Waterford Lakes Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	8,679
Initial Cost Buildings and Improvements	72,836
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	27,976
Gross Amounts At Which Carried at Close of Period Land	8,679
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	100,812
Total cost per Schedule III	109,491
Accumulated Depreciation	59,588
Malls [Member] | Weberstown Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	65,000
Initial Cost Land	9,909
Initial Cost Buildings and Improvements	92,589
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4,988
Gross Amounts At Which Carried at Close of Period Land	9,909
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	97,577
Total cost per Schedule III	107,486
Accumulated Depreciation	14,723
Malls [Member] | West Ridge Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	39,945
Initial Cost Land	5,453
Initial Cost Buildings and Improvements	34,148
Cost Capitalized Subsequent to Construction or Acquisition Land	(788)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	20,642
Gross Amounts At Which Carried at Close of Period Land	4,665
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	54,790
Total cost per Schedule III	59,455
Accumulated Depreciation	37,620
Malls [Member] | Westminster Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	78,375
Initial Cost Land	43,464
Initial Cost Buildings and Improvements	84,709
Cost Capitalized Subsequent to Construction or Acquisition Land	(180)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	42,567
Gross Amounts At Which Carried at Close of Period Land	43,284
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	127,276
Total cost per Schedule III	170,560
Accumulated Depreciation	68,807
Malls [Member] | WestShore Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	53,904
Initial Cost Buildings and Improvements	120,191
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4,755
Gross Amounts At Which Carried at Close of Period Land	53,904
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	124,946
Total cost per Schedule III	178,850
Accumulated Depreciation	17,752
Open Air Properties [Member] | Bloomingdale Court [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	8,422
Initial Cost Buildings and Improvements	26,184
Cost Capitalized Subsequent to Construction or Acquisition Land	(395)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	19,017
Gross Amounts At Which Carried at Close of Period Land	8,027
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	45,201
Total cost per Schedule III	53,228
Accumulated Depreciation	29,851
Open Air Properties [Member] | Bowie Town Center Strip [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	231
Initial Cost Buildings and Improvements	4,597
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	819
Gross Amounts At Which Carried at Close of Period Land	231
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	5,416
Total cost per Schedule III	5,647
Accumulated Depreciation	2,741
Open Air Properties [Member] | Canyon View Marketplace [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	5,215
Initial Cost Land	1,370
Initial Cost Buildings and Improvements	9,570
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	120
Gross Amounts At Which Carried at Close of Period Land	1,370
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	9,690
Total cost per Schedule III	11,060
Accumulated Depreciation	1,057
Open Air Properties [Member] | Charles Towne Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	1,768
Cost Capitalized Subsequent to Construction or Acquisition Land	370
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	10,890
Gross Amounts At Which Carried at Close of Period Land	370
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	12,658
Total cost per Schedule III	13,028
Accumulated Depreciation	12,209
Open Air Properties [Member] | Chesapeake Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	4,410
Initial Cost Buildings and Improvements	11,241
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,504
Gross Amounts At Which Carried at Close of Period Land	4,410
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	12,745
Total cost per Schedule III	17,155
Accumulated Depreciation	10,203
Open Air Properties [Member] | Concord Mills Marketplace [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	16,000
Initial Cost Land	8,036
Initial Cost Buildings and Improvements	21,167
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	956
Gross Amounts At Which Carried at Close of Period Land	8,036
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	22,123
Total cost per Schedule III	30,159
Accumulated Depreciation	5,795
Open Air Properties [Member] | Countryside Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	332
Initial Cost Buildings and Improvements	8,507
Cost Capitalized Subsequent to Construction or Acquisition Land	2,554
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	12,039
Gross Amounts At Which Carried at Close of Period Land	2,886
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	20,546
Total cost per Schedule III	23,432
Accumulated Depreciation	13,269
Open Air Properties [Member] | Dare Centre [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	5,702
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	2,405
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	8,107
Total cost per Schedule III	8,107
Accumulated Depreciation	4,221
Open Air Properties [Member] | DeKalb Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	1,955
Initial Cost Buildings and Improvements	3,405
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,394
Gross Amounts At Which Carried at Close of Period Land	1,955
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	4,799
Total cost per Schedule III	6,754
Accumulated Depreciation	2,818
Open Air Properties [Member] | Empire East [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	3,350
Initial Cost Buildings and Improvements	10,552
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	2,799
Gross Amounts At Which Carried at Close of Period Land	3,350
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	13,351
Total cost per Schedule III	16,701
Accumulated Depreciation	3,698
Open Air Properties [Member] | Fairfax Court [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	8,078
Initial Cost Buildings and Improvements	34,997
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,470
Gross Amounts At Which Carried at Close of Period Land	8,078
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	36,467
Total cost per Schedule III	44,545
Accumulated Depreciation	6,309
Open Air Properties [Member] | Fairfield Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	4,745
Initial Cost Buildings and Improvements	5,044
Cost Capitalized Subsequent to Construction or Acquisition Land	168
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	38,799
Gross Amounts At Which Carried at Close of Period Land	4,913
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	43,843
Total cost per Schedule III	48,756
Accumulated Depreciation	3,889
Open Air Properties [Member] | Forest Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	15,588
Initial Cost Land	4,132
Initial Cost Buildings and Improvements	16,818
Cost Capitalized Subsequent to Construction or Acquisition Land	453
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	12,499
Gross Amounts At Which Carried at Close of Period Land	4,585
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	29,317
Total cost per Schedule III	33,902
Accumulated Depreciation	17,845
Open Air Properties [Member] | Gaitway Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	5,445
Initial Cost Buildings and Improvements	26,687
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	2,293
Gross Amounts At Which Carried at Close of Period Land	5,445
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	28,980
Total cost per Schedule III	34,425
Accumulated Depreciation	5,994
Open Air Properties [Member] | Greenwood Plus [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	1,129
Initial Cost Buildings and Improvements	1,792
Cost Capitalized Subsequent to Construction or Acquisition Land	(58)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4,905
Gross Amounts At Which Carried at Close of Period Land	1,071
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	6,697
Total cost per Schedule III	7,768
Accumulated Depreciation	4,647
Open Air Properties [Member] | Henderson Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	4,223
Initial Cost Buildings and Improvements	15,124
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,080
Gross Amounts At Which Carried at Close of Period Land	4,223
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	16,204
Total cost per Schedule III	20,427
Accumulated Depreciation	7,228
Open Air Properties [Member] | Keystone Shoppers [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	4,232
Cost Capitalized Subsequent to Construction or Acquisition Land	2,118
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	5,356
Gross Amounts At Which Carried at Close of Period Land	2,118
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	9,588
Total cost per Schedule III	11,706
Accumulated Depreciation	4,218
Open Air Properties [Member] | Lake Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	2,487
Initial Cost Buildings and Improvements	6,420
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	2,515
Gross Amounts At Which Carried at Close of Period Land	2,487
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	8,935
Total cost per Schedule III	11,422
Accumulated Depreciation	5,830
Open Air Properties [Member] | Lake View Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	4,702
Initial Cost Buildings and Improvements	17,543
Cost Capitalized Subsequent to Construction or Acquisition Land	(89)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	18,646
Gross Amounts At Which Carried at Close of Period Land	4,613
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	36,189
Total cost per Schedule III	40,802
Accumulated Depreciation	23,456
Open Air Properties [Member] | Lakeline Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,604
Initial Cost Land	5,822
Initial Cost Buildings and Improvements	30,875
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	14,815
Gross Amounts At Which Carried at Close of Period Land	5,822
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	45,690
Total cost per Schedule III	51,512
Accumulated Depreciation	25,086
Open Air Properties [Member] | Lima Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	1,781
Initial Cost Buildings and Improvements	5,151
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	10,056
Gross Amounts At Which Carried at Close of Period Land	1,781
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	15,207
Total cost per Schedule III	16,988
Accumulated Depreciation	10,259
Open Air Properties [Member] | Lincoln Crossing [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	674
Initial Cost Buildings and Improvements	2,192
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	9,543
Gross Amounts At Which Carried at Close of Period Land	674
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	11,735
Total cost per Schedule III	12,409
Accumulated Depreciation	3,597
Open Air Properties [Member] | MacGregor Village [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	502
Initial Cost Buildings and Improvements	8,891
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,053
Gross Amounts At Which Carried at Close of Period Land	502
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	11,944
Total cost per Schedule III	12,446
Accumulated Depreciation	4,527
Open Air Properties [Member] | Mall of Georgia Crossing [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	22,208
Initial Cost Land	9,506
Initial Cost Buildings and Improvements	32,892
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,011
Gross Amounts At Which Carried at Close of Period Land	9,506
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	35,903
Total cost per Schedule III	45,409
Accumulated Depreciation	20,776
Open Air Properties [Member] | Markland Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	206
Initial Cost Buildings and Improvements	738
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	8,300
Gross Amounts At Which Carried at Close of Period Land	206
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	9,038
Total cost per Schedule III	9,244
Accumulated Depreciation	4,919
Open Air Properties [Member] | Martinsville Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	584
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,003
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	3,587
Total cost per Schedule III	3,587
Accumulated Depreciation	359
Open Air Properties [Member] | Matteson Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	1,771
Initial Cost Buildings and Improvements	9,737
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	47
Gross Amounts At Which Carried at Close of Period Land	1,771
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	9,784
Total cost per Schedule III	11,555
Accumulated Depreciation	9,655
Open Air Properties [Member] | Muncie Towne Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,071
Initial Cost Land	267
Initial Cost Buildings and Improvements	10,509
Cost Capitalized Subsequent to Construction or Acquisition Land	87
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,660
Gross Amounts At Which Carried at Close of Period Land	354
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	14,169
Total cost per Schedule III	14,523
Accumulated Depreciation	8,422
Open Air Properties [Member] | North Ridge Shopping Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,764
Initial Cost Land	385
Initial Cost Buildings and Improvements	12,826
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	7,522
Gross Amounts At Which Carried at Close of Period Land	385
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	20,348
Total cost per Schedule III	20,733
Accumulated Depreciation	7,077
Open Air Properties [Member] | Northwood Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	148
Initial Cost Buildings and Improvements	1,414
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,481
Gross Amounts At Which Carried at Close of Period Land	148
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	4,895
Total cost per Schedule III	5,043
Accumulated Depreciation	3,140
Open Air Properties [Member] | The Plaza at Buckland Hills [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	17,355
Initial Cost Buildings and Improvements	43,900
Cost Capitalized Subsequent to Construction or Acquisition Land	(281)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4,394
Gross Amounts At Which Carried at Close of Period Land	17,074
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	48,294
Total cost per Schedule III	65,368
Accumulated Depreciation	7,049
Open Air Properties [Member] | Richardson Square [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	6,285
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	990
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	14,818
Gross Amounts At Which Carried at Close of Period Land	7,275
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	14,818
Total cost per Schedule III	22,093
Accumulated Depreciation	6,108
Open Air Properties [Member] | Rockaway Commons [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	5,149
Initial Cost Buildings and Improvements	26,435
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	16,447
Gross Amounts At Which Carried at Close of Period Land	5,149
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	42,882
Total cost per Schedule III	48,031
Accumulated Depreciation	20,038
Open Air Properties [Member] | Rockaway Town Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	18,698
Cost Capitalized Subsequent to Construction or Acquisition Land	2,227
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	5,187
Gross Amounts At Which Carried at Close of Period Land	2,227
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	23,885
Total cost per Schedule III	26,112
Accumulated Depreciation	9,993
Open Air Properties [Member] | Royal Eagle Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	2,153
Initial Cost Buildings and Improvements	24,216
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,253
Gross Amounts At Which Carried at Close of Period Land	2,153
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	27,469
Total cost per Schedule III	29,622
Accumulated Depreciation	6,509
Open Air Properties [Member] | The Shops at North East Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	12,541
Initial Cost Buildings and Improvements	28,177
Cost Capitalized Subsequent to Construction or Acquisition Land	402
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	7,592
Gross Amounts At Which Carried at Close of Period Land	12,943
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	35,769
Total cost per Schedule III	48,712
Accumulated Depreciation	24,629
Open Air Properties [Member] | St. Charles Towne Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	8,216
Initial Cost Buildings and Improvements	18,993
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	10,242
Gross Amounts At Which Carried at Close of Period Land	8,216
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	29,235
Total cost per Schedule III	37,451
Accumulated Depreciation	17,860
Open Air Properties [Member] | Tippecanoe Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	745
Cost Capitalized Subsequent to Construction or Acquisition Land	234
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	5,821
Gross Amounts At Which Carried at Close of Period Land	234
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	6,566
Total cost per Schedule III	6,800
Accumulated Depreciation	4,216
Open Air Properties [Member] | University Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	2,119
Initial Cost Buildings and Improvements	8,365
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	5,190
Gross Amounts At Which Carried at Close of Period Land	2,119
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	13,555
Total cost per Schedule III	15,674
Accumulated Depreciation	10,703
Open Air Properties [Member] | University Town Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	6,009
Initial Cost Buildings and Improvements	26,945
Cost Capitalized Subsequent to Construction or Acquisition Land	(579)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	381
Gross Amounts At Which Carried at Close of Period Land	5,430
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	27,326
Total cost per Schedule III	32,756
Accumulated Depreciation	8,739
Open Air Properties [Member] | Village Park Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	19,565
Initial Cost Buildings and Improvements	51,873
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	1,065
Gross Amounts At Which Carried at Close of Period Land	19,565
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	52,938
Total cost per Schedule III	72,503
Accumulated Depreciation	13,319
Open Air Properties [Member] | Washington Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	263
Initial Cost Buildings and Improvements	1,833
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	3,049
Gross Amounts At Which Carried at Close of Period Land	263
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	4,882
Total cost per Schedule III	5,145
Accumulated Depreciation	4,224
Open Air Properties [Member] | West Ridge Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,986
Initial Cost Land	1,376
Initial Cost Buildings and Improvements	4,560
Cost Capitalized Subsequent to Construction or Acquisition Land	1,958
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	8,498
Gross Amounts At Which Carried at Close of Period Land	3,334
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	13,058
Total cost per Schedule III	16,392
Accumulated Depreciation	6,799
Open Air Properties [Member] | West Town Corners [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	6,821
Initial Cost Buildings and Improvements	24,603
Cost Capitalized Subsequent to Construction or Acquisition Land	(174)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	6,901
Gross Amounts At Which Carried at Close of Period Land	6,647
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	31,504
Total cost per Schedule III	38,151
Accumulated Depreciation	6,150
Open Air Properties [Member] | Westland Park Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	5,576
Initial Cost Buildings and Improvements	8,775
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4
Gross Amounts At Which Carried at Close of Period Land	5,576
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	8,779
Total cost per Schedule III	14,355
Accumulated Depreciation	2,016
Open Air Properties [Member] | White Oaks Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	12,143
Initial Cost Land	3,169
Initial Cost Buildings and Improvements	14,267
Cost Capitalized Subsequent to Construction or Acquisition Land	292
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	11,204
Gross Amounts At Which Carried at Close of Period Land	3,461
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	25,471
Total cost per Schedule III	28,932
Accumulated Depreciation	14,004
Open Air Properties [Member] | Whitehall Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	8,500
Initial Cost Buildings and Improvements	28,512
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	4,680
Gross Amounts At Which Carried at Close of Period Land	8,500
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	33,192
Total cost per Schedule III	41,692
Accumulated Depreciation	7,860
Open Air Properties [Member] | Wolf Ranch [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	21,999
Initial Cost Buildings and Improvements	51,547
Cost Capitalized Subsequent to Construction or Acquisition Land	(185)
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	13,815
Gross Amounts At Which Carried at Close of Period Land	21,814
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	65,362
Total cost per Schedule III	87,176
Accumulated Depreciation	31,398
Developments in Progress [Member] | Cottonwood Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	826
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	1,525
Total cost per Schedule III	2,351
Accumulated Depreciation	0
Developments in Progress [Member] | Dayton Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	1,828
Total cost per Schedule III	1,828
Accumulated Depreciation	0
Developments in Progress [Member] | Grand Central Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	1,362
Total cost per Schedule III	1,362
Accumulated Depreciation	0
Developments in Progress [Member] | Great Lakes Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	6,243
Total cost per Schedule III	6,243
Accumulated Depreciation	0
Developments in Progress [Member] | Northwoods Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	117
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	2,595
Total cost per Schedule III	2,712
Accumulated Depreciation	0
Developments in Progress [Member] | Southern Park Mall [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	1,293
Total cost per Schedule III	1,293
Accumulated Depreciation	0
Developments in Progress [Member] | WestShore Plaza [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	6,700
Total cost per Schedule III	6,700
Accumulated Depreciation	0
Developments in Progress [Member] | Fairfield Town Center [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	3,203
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	779
Total cost per Schedule III	3,982
Accumulated Depreciation	0
Developments in Progress [Member] | MacGregor Village [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	0
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	1,790
Total cost per Schedule III	1,790
Accumulated Depreciation	0
Developments in Progress [Member] | Other Developments [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost Land	0
Initial Cost Buildings and Improvements	0
Cost Capitalized Subsequent to Construction or Acquisition Land	0
Cost Capitalized Subsequent to Construction or Acquisition Buildings and Improvements	0
Gross Amounts At Which Carried at Close of Period Land	1,200
Gross Amounts At Which Carried at Close of Period Buildings and Improvements	12,307
Total cost per Schedule III	13,507
Accumulated Depreciation	$ 0

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation - Changes in Real Estate Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance, beginning of year	$ 5,715,996	$ 6,205,387	$ 6,699,789
Acquisitions	72,647	14,366	297
Improvements	143,123	135,713	157,561
Held for sale reclasses	0	0	(215,244)
Disposals	(114,613)	(639,470)	(437,016)
Balance, end of year	5,817,153	5,715,996	6,205,387
Impairment of real estate	$ 0	$ 66,925	$ 21,879

Schedule III - Real Estate an_4

Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Investment Properties at Cost (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Investment properties at cost	$ 5,914,705	$ 5,807,760
Total cost per Schedule III	5,817,153	$ 5,715,996	$ 6,205,387	$ 6,699,789
Aggregate cost for federal income tax purposes of real estate assets	5,334,779
Furniture Fixtures and Equipment [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Investment properties at cost	$ 97,552

Schedule III - Real Estate an_5

Schedule III - Real Estate and Accumulated Depreciation - Changes in Accumulated Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance, beginning of year	$ 2,076,948	$ 2,063,107	$ 2,261,593
Depreciation expense	205,724	205,078	222,861
Disposals	(70,196)	(191,237)	(421,347)
Balance, end of year	$ 2,212,476	$ 2,076,948	$ 2,063,107

Schedule III - Real Estate an_6

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	Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Accumulated depreciation	$ 2,283,764	$ 2,139,620
Total accumulated depreciation per Schedule III	2,212,476	$ 2,076,948	$ 2,063,107	$ 2,261,593
Furniture Fixtures and Equipment [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Accumulated depreciation	$ 71,288
HVAC Equipment [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Life used for depreciation	10 years
Land Improvements [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Life used for depreciation	15 years
Maximum [Member] | Building and Building Improvements [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Life used for depreciation	40 years
Minimum [Member] | Building and Building Improvements [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Life used for depreciation	10 years

Uncategorized Items - wpg-20181

Label	Element	Value
Washington Prime Group, L.P. [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 2,474,000
Washington Prime Group, L.P. [Member] | Noncontrolling Interests [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Washington Prime Group, L.P. [Member] | Partners' Equity [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	2,474,000
Washington Prime Group, L.P. [Member] | Partners' Equity [Member] | Limited Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	389,000
Washington Prime Group, L.P. [Member] | Partners' Equity [Member] | General Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	2,085,000
Washington Prime Group, L.P. [Member] | Partners' Equity [Member] | General Partner Common Equity [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	2,085,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(389,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1,890,000
Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	2,085,000
Noncontrolling Interest [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 389,000