Retail Opportunity Investments (ROIC) 10-K 20 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. 15, 2019	Jun. 30, 2018
Document Information [Line Items]
Entity Registrant Name	RETAIL OPPORTUNITY INVESTMENTS CORP
Trading Symbol	roic
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		113,996,474
Entity Public Float			$ 2.1
Amendment Flag	false
Entity Central Index Key	1,407,623
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Retail Opportunity Investments Partnership L.P.
Document Information [Line Items]
Entity Registrant Name	Retail Opportunity Investments Partnerships L.P.
Document Type	10-K
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	1,577,230
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate Investments:
Land	$ 894,240	$ 878,797
Building and improvements	2,266,232	2,230,600
Total real estate investments	3,160,472	3,109,397
Less: accumulated depreciation	329,207	260,115
Real Estate Investments, net	2,831,265	2,849,282
Cash and cash equivalents	6,076	11,553
Restricted cash	1,373	5,412
Tenant and other receivables, net	46,832	43,257
Deposits	0	500
Acquired lease intangible assets, net	72,109	82,778
Prepaid expenses	4,194	2,853
Deferred charges, net	33,857	37,167
Other	7,365	6,396
Total assets	3,003,071	3,039,198
Liabilities:
Term loan	299,076	298,816
Credit facility	153,689	140,329
Senior Notes	941,449	940,086
Mortgage notes payable	88,511	107,915
Acquired lease intangible liabilities, net	166,146	178,984
Accounts payable and accrued expenses	15,488	18,638
Tenants’ security deposits	7,065	6,771
Other liabilities	23,219	18,018
Total liabilities	1,694,643	1,709,557
Commitments and contingencies
Equity/Capital:
Preferred stock, $.0001 par value 50,000,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.0001 par value, 500,000,000 shares authorized; 113,992,837 and 112,347,451 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	11	11
Additional paid-in-capital	1,441,080	1,412,590
Dividends in excess of earnings	(256,438)	(210,490)
Accumulated other comprehensive income	3,561	1,856
Total Retail Opportunity Investments Corp. stockholders' equity	1,188,214	1,203,967
Non-controlling interests	120,214	125,674
Total equity/capital	1,308,428	1,329,641
Total liabilities and equity/capital	3,003,071	3,039,198
Retail Opportunity Investments Partnership L.P.
Real Estate Investments:
Land	894,240	878,797
Building and improvements	2,266,232	2,230,600
Total real estate investments	3,160,472	3,109,397
Less: accumulated depreciation	329,207	260,115
Real Estate Investments, net	2,831,265	2,849,282
Cash and cash equivalents	6,076	11,553
Restricted cash	1,373	5,412
Tenant and other receivables, net	46,832	43,257
Deposits	0	500
Acquired lease intangible assets, net	72,109	82,778
Prepaid expenses	4,194	2,853
Deferred charges, net	33,857	37,167
Other	7,365	6,396
Total assets	3,003,071	3,039,198
Liabilities:
Term loan	299,076	298,816
Credit facility	153,689	140,329
Senior Notes	941,449	940,086
Mortgage notes payable	88,511	107,915
Acquired lease intangible liabilities, net	166,146	178,984
Accounts payable and accrued expenses	15,488	18,638
Tenants’ security deposits	7,065	6,771
Other liabilities	23,219	18,018
Total liabilities	1,694,643	1,709,557
Commitments and contingencies
Equity/Capital:
ROIC capital	1,184,653	1,202,111
Limited partners’ capital	120,214	125,674
Accumulated other comprehensive income	3,561	1,856
Total equity/capital	1,308,428	1,329,641
Total liabilities and equity/capital	$ 3,003,071	$ 3,039,198

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Preferred stock par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	113,992,837	112,347,451
Common stock, shares outstanding (in shares)	113,992,837	112,347,451

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
Revenues
Base rents	$ 223,797	$ 210,564	$ 183,330
Recoveries from tenants	65,804	58,818	51,454
Other income	6,197	3,878	2,405
Total revenues	295,798	273,260	237,189
Operating expenses
Property operating	43,851	39,151	32,201
Property taxes	32,349	29,663	25,058
Depreciation and amortization	100,838	96,256	88,359
General and administrative expenses	14,918	14,103	13,120
Acquisition transaction costs	0	4	824
Other expense	478	418	456
Total operating expenses	192,434	179,595	160,018
Gain on sale of real estate	5,890	0	0
Operating income	109,254	93,665	77,171
Non-operating expenses
Interest expense and other finance expenses	(62,113)	(50,977)	(40,741)
Net income	47,141	42,688	36,430
Net income attributable to non-controlling interests	(4,405)	(4,211)	(3,676)
Net Income Attributable to Retail Opportunity Investments Corp.	$ 42,736	$ 38,477	$ 32,754
Earnings per share/unit - basic and diluted (in usd per share)	$ 0.38	$ 0.35	$ 0.31
Dividends per share (in dollars per share)	$ 0.78	$ 0.75	$ 0.72
Comprehensive income:
Net income	$ 47,141	$ 42,688	$ 36,430
Unrealized swap derivative gain arising during the period	1,648	3,665	541
Reclassification adjustment for amortization of interest expense included in net income	57	1,920	2,473
Other comprehensive income	1,705	5,585	3,014
Comprehensive income	48,846	48,273	39,444
Comprehensive income attributable to non-controlling interests	(4,405)	(4,211)	(3,676)
Comprehensive income attributable to Retail Opportunity Investments Corp.	44,441	44,062	35,768
Retail Opportunity Investments Partnership L.P.
Revenues
Base rents	223,797	210,564	183,330
Recoveries from tenants	65,804	58,818	51,454
Other income	6,197	3,878	2,405
Total revenues	295,798	273,260	237,189
Operating expenses
Property operating	43,851	39,151	32,201
Property taxes	32,349	29,663	25,058
Depreciation and amortization	100,838	96,256	88,359
General and administrative expenses	14,918	14,103	13,120
Acquisition transaction costs	0	4	824
Other expense	478	418	456
Total operating expenses	192,434	179,595	160,018
Gain on sale of real estate	5,890	0	0
Operating income	109,254	93,665	77,171
Non-operating expenses
Interest expense and other finance expenses	(62,113)	(50,977)	(40,741)
Net income	$ 47,141	$ 42,688	$ 36,430
Earnings per share/unit - basic and diluted (in usd per share)	$ 0.38	$ 0.35	$ 0.31
Dividends per share (in dollars per share)	$ 0.78	$ 0.75	$ 0.72
Comprehensive income:
Net income	$ 47,141	$ 42,688	$ 36,430
Unrealized swap derivative gain arising during the period	1,648	3,665	541
Reclassification adjustment for amortization of interest expense included in net income	57	1,920	2,473
Other comprehensive income	1,705	5,585	3,014
Comprehensive income	$ 48,846	$ 48,273	$ 39,444

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Officer	Common Stock	Additional paid-in capital	Accumulated dividends in excess of earnings	Accumulated dividends in excess of earningsOfficer	Accumulated other comprehensive (loss) income	Non- controlling interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total (in shares)			99,531,034
Balance at Dec. 31, 2015	$ 1,131,342		$ 10	$ 1,166,395	$ (122,991)		$ (6,743)	$ 94,671
Balance (in shares) at Dec. 31, 2015			99,531,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under the 2009 Equity Incentive Plan (in shares)			341,306
Shares withheld for employee taxes (in shares)			(76,262)
Shares withheld for employee taxes	(1,368)			(1,368)
Cancellation of restricted stock (in shares)			(7,332)
Stock based compensation expense	4,916			4,916
Issuance of OP Units to non-controlling interests	48,175							48,175
Redemption of OP Units (in shares)			755,762
Redemption of OP Units	15,990			15,990				(15,990)
Cash redemption for non-controlling interests	(7,182)							(7,182)
Adjustment to non-controlling interests ownership in Operating Partnership				(5,627)				5,627
Proceeds from the issuance of common stock (in shares)			8,757,254
Proceeds from the issuance of common stock	184,881		$ 1	184,880
Registration expenditures	(7,276)			(7,276)
Cash dividends	(83,900)	$ (177)			(75,537)	$ (177)		(8,363)
Net income attributable to Retail Opportunity Investments Corp.	32,754				32,754
Net income attributable to non-controlling interests	3,676							3,676
Other comprehensive income	3,014						3,014
Total (in shares)			99,531,034
Total	1,308,855		$ 11	1,357,910	(165,951)		(3,729)	120,614
Proceeds from repayment of promissory note receivable secured by equity	6,710							6,710
Balance (in shares) at Dec. 31, 2016			109,301,762
Balance at Dec. 31, 2016	1,315,565		$ 11	1,357,910	(165,951)		(3,729)	127,324
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total (in shares)			109,301,762
Shares issued under the 2009 Equity Incentive Plan (in shares)			353,261
Shares issued under the 2009 Equity Incentive Plan	44			44
Shares withheld for employee taxes (in shares)			(74,331)
Shares withheld for employee taxes	(1,571)			(1,571)
Cancellation of restricted stock (in shares)			(1,999)
Stock based compensation expense	6,190			6,190
Issuance of OP Units to non-controlling interests	49,599							49,599
Redemption of OP Units	50,155
Equity redemption and exchange of OP Units (in shares)			2,555,933
Equity redemption and exchange of OP Units				50,155				(50,155)
Cash redemption for non-controlling interests	(150)							(150)
Adjustment to non-controlling interests ownership in Operating Partnership				(3,574)				3,574
Proceeds from the issuance of common stock (in shares)			212,825
Proceeds from the issuance of common stock	4,481		$ 0	4,481
Registration expenditures	(1,045)			(1,045)
Cash dividends	(91,510)	(235)			(82,781)	(235)		(8,729)
Net income attributable to Retail Opportunity Investments Corp.	38,477				38,477
Net income attributable to non-controlling interests	4,211							4,211
Other comprehensive income	$ 5,585						5,585
Total (in shares)	112,347,451		109,301,762
Balance (in shares) at Dec. 31, 2017	112,347,451		112,347,451
Balance at Dec. 31, 2017	$ 1,329,641		$ 11	1,412,590	(210,490)		1,856	125,674
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total (in shares)	112,347,451		112,347,451
Shares issued under the 2009 Equity Incentive Plan (in shares)			397,861
Shares issued under the 2009 Equity Incentive Plan	$ 269			269
Shares withheld for employee taxes (in shares)			(70,168)
Shares withheld for employee taxes	(1,400)			(1,400)
Cancellation of restricted stock (in shares)			(8,997)
Stock based compensation expense	7,392			7,392
Redemption of OP Units	0
Cash redemption for non-controlling interests	(3,713)							(3,713)
Adjustment to non-controlling interests ownership in Operating Partnership				(2,904)				2,904
Proceeds from the issuance of common stock (in shares)			1,326,690
Proceeds from the issuance of common stock	25,703			25,703
Registration expenditures	(570)			(570)
Cash dividends	(97,473)	$ (267)			(88,417)	$ (267)		(9,056)
Net income attributable to Retail Opportunity Investments Corp.	42,736				42,736
Net income attributable to non-controlling interests	4,405							4,405
Other comprehensive income	$ 1,705						1,705
Total (in shares)	112,347,451		112,347,451
Balance (in shares) at Dec. 31, 2018	113,992,837		113,992,837
Balance at Dec. 31, 2018	$ 1,308,428		$ 11	$ 1,441,080	$ (256,438)		$ 3,561	$ 120,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total (in shares)	113,992,837		113,992,837

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividends per share (in dollars per share)	$ 0.78	$ 0.75	$ 0.72

Consolidated Statement of Partn

Consolidated Statement of Partners' Capital - USD ($) $ in Thousands		Total	Retail Opportunity Investments Partnership L.P.	Retail Opportunity Investments Partnership L.P.Officer	Retail Opportunity Investments Partnership L.P.Limited Partner’s Capital		Retail Opportunity Investments Partnership L.P.ROIC Capital		Retail Opportunity Investments Partnership L.P.ROIC CapitalOfficer	[2]	Retail Opportunity Investments Partnership L.P.Accumulated other comprehensive (loss) income
Total (in shares)					12,195,603	[1]	99,531,034	[2]
Balance (in shares) at Dec. 31, 2015					12,195,603	[1]	99,531,034	[2]
Balance at Dec. 31, 2015			$ 1,131,342		$ 94,671	[1]	$ 1,043,414	[2]			$ (6,743)
OP Units issued under the 2009 Equity Incentive Plan (in shares)	[2]						341,306
OP Units withheld for employee taxes (in shares)	[2]						(76,262)
OP Units withheld for employee taxes		$ (1,368)	(1,368)				$ (1,368)	[2]
Cancellation of OP Units (in shares)	[2]						(7,332)
Stock based compensation expense		4,916	4,916				$ 4,916	[2]
Issuance of OP Units in connection with acquisition (in shares)	[1]				2,434,833
Issuance of OP Units in connection with acquisition			48,175		$ 48,175	[1]
Equity redemption of OP Units (in shares)					(755,762)	[1]	755,762	[2]
Equity redemption of OP Units		15,990			$ (15,990)	[1]	$ 15,990	[2]
Cash redemption of OP Units (in shares)	[1]				(2,206,613)
Cash redemption of OP Units		(7,182)	(7,182)		$ (7,182)	[1]
Adjustment to non-controlling interests ownership in Operating Partnership					5,627	[1]	$ (5,627)	[2]
Issuance of OP Units in connection with common stock offering (in shares)	[2]						8,757,254
Issuance of OP Units in connection with common stock offering		184,881	184,881				$ 184,881	[2]
Registration expenditures		(7,276)	(7,276)				(7,276)	[2]
Cash distributions			(83,900)	$ (177)	(8,363)	[1]	(75,537)	[2]	$ (177)
Net income		36,430	36,430		$ 3,676	[1]	$ 32,754	[2]
Other comprehensive income		3,014	3,014								3,014
Total (in shares)					12,195,603	[1]	99,531,034	[2]
Total			1,308,855		$ 120,614	[1]	$ 1,191,970	[2]			(3,729)
Proceeds from repayment of promissory note receivable secured by capital		6,710	6,710		$ 6,710	[1]
Balance (in shares) at Dec. 31, 2016					11,668,061	[1]	109,301,762	[2]
Balance at Dec. 31, 2016			1,315,565		$ 127,324	[1]	$ 1,191,970	[2]			(3,729)
Total (in shares)					11,668,061	[1]	109,301,762	[2]
OP Units issued under the 2009 Equity Incentive Plan (in shares)	[2]						353,261
OP units issued under the 2009 Equity Incentive Plan		44	44				$ 44	[2]
OP Units withheld for employee taxes (in shares)	[2]						(74,331)
OP Units withheld for employee taxes		(1,571)	(1,571)				$ (1,571)	[2]
Cancellation of OP Units (in shares)	[2]						(1,999)
Stock based compensation expense		6,190	6,190				$ 6,190	[2]
Issuance of OP Units in connection with acquisition (in shares)	[1]				2,573,927
Issuance of OP Units in connection with acquisition			49,599		$ 49,599	[1]
Equity redemption of OP Units (in shares)					(2,555,933)	[1]	2,555,933	[2]
Equity redemption of OP Units		50,155			$ (50,155)	[1]	$ 50,155	[2]
Cash redemption of OP Units (in shares)	[1]				(7,064)
Cash redemption of OP Units		(150)	(150)		$ (150)	[1]
Adjustment to non-controlling interests ownership in Operating Partnership					3,574	[1]	$ (3,574)	[2]
Issuance of OP Units in connection with common stock offering (in shares)	[2]						212,825
Issuance of OP Units in connection with common stock offering		4,481	4,481				$ 4,481	[2]
Registration expenditures		(1,045)	(1,045)				(1,045)	[2]
Cash distributions			(91,510)	(235)	(8,729)	[1]	(82,781)	[2]	(235)
Net income		42,688	42,688		$ 4,211	[1]	$ 38,477	[2]
Other comprehensive income		5,585	5,585								5,585
Total (in shares)					11,668,061	[1]	109,301,762	[2]
Balance (in shares) at Dec. 31, 2017					11,678,991		112,347,451
Balance at Dec. 31, 2017			1,329,641		$ 125,674		$ 1,202,111				1,856
Total (in shares)					11,678,991		112,347,451
OP Units issued under the 2009 Equity Incentive Plan (in shares)	[2]						397,861
OP units issued under the 2009 Equity Incentive Plan		269	269				$ 269	[2]
OP Units withheld for employee taxes (in shares)	[2]						(70,168)
OP Units withheld for employee taxes		(1,400)	(1,400)				$ (1,400)	[2]
Cancellation of OP Units (in shares)	[2]						(8,997)
Stock based compensation expense		7,392	7,392				$ 7,392	[2]
Equity redemption of OP Units		$ 0
Cash redemption of OP Units (in shares)		(201,950)			(201,950)	[1]
Cash redemption of OP Units		$ (3,713)	(3,713)		$ (3,713)	[1]
Adjustment to non-controlling interests ownership in Operating Partnership					2,904	[1]	$ (2,904)	[2]
Issuance of OP Units in connection with common stock offering (in shares)	[2]						1,326,690
Issuance of OP Units in connection with common stock offering		25,703	25,703				$ 25,703	[2]
Registration expenditures		(570)	(570)				(570)	[2]
Cash distributions			(97,473)	$ (267)	(9,056)	[1]	(88,417)	[2]	$ (267)
Net income		47,141	47,141		$ 4,405	[1]	$ 42,736	[2]
Other comprehensive income		$ 1,705	1,705								1,705
Total (in shares)		125,469,878			11,678,991		112,347,451
Balance (in shares) at Dec. 31, 2018		125,469,878			11,477,041		113,992,837
Balance at Dec. 31, 2018			$ 1,308,428		$ 120,214		$ 1,184,653				$ 3,561
Total (in shares)		125,469,878			11,477,041		113,992,837
[1]	Consists of limited partnership interests held by third parties.
[2]	Consists of general and limited partnership interests held by ROIC.

Consolidated Statement of Par_2

Consolidated Statement of Partners' Capital (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash distributions per unit (usd per share)	$ 0.78	$ 0.75	$ 0.72
Retail Opportunity Investments Partnership L.P.
Cash distributions per unit (usd per share)	$ 0.78	$ 0.75	$ 0.72

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	$ 47,141	$ 42,688	$ 36,430
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	100,838	96,256	88,359
Amortization of deferred financing costs and mortgage premiums, net	1,899	2,026	2,088
Straight-line rent adjustment	(5,380)	(6,176)	(4,560)
Amortization of above and below market rent	(13,965)	(17,078)	(13,847)
Amortization relating to stock based compensation	7,392	6,190	4,916
Provisions for tenant credit losses	1,729	1,191	1,805
Other noncash interest expense	1,674	2,139	2,139
Gain on sale of real estate	(5,890)	0	0
Change in operating assets and liabilities:
Tenant and other receivables	(57)	(2,452)	(4,412)
Prepaid expenses	(1,344)	464	(1,363)
Accounts payable and accrued expenses	(1,622)	456	4,417
Other assets and liabilities, net	(1,497)	3,234	(1,357)
Net cash provided by operating activities	130,918	128,938	114,615
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in real estate	(44,195)	(263,366)	(284,867)
Proceeds from sale of real estate	26,880	0	0
Improvements to properties	(39,240)	(54,097)	(40,758)
Deposits on real estate acquisitions, net	500	(500)	500
Net cash used in investing activities	(56,055)	(317,963)	(325,125)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal repayments on mortgages	(19,612)	(8,848)	(7,816)
Proceeds from draws on credit facility	177,000	327,500	332,500
Payments on credit facility	(164,500)	(282,000)	(370,000)
Proceeds from issuance of Senior Notes	0	250,000	200,000
Proceeds on repayment of promissory note receivable	0	0	6,710
Redemption of OP Units	(3,713)	(150)	(38,820)
Distributions to OP Unitholders	(9,056)	(8,729)	(8,363)
Deferred financing and other costs	0	(3,845)	(266)
Proceeds from the issuance of common stock	25,703	4,481	184,881
Registration expenditures	(570)	(1,225)	(7,097)
Dividends paid to common shareholders	(88,500)	(82,917)	(75,672)
Common shares issued under the 2009 Equity Incentive Plan	269	44	0
Shares withheld for employee taxes	(1,400)	(1,571)	(1,368)
Net cash (used in) provided by financing activities	(84,379)	192,740	214,689
Net (decrease) increase in cash, cash equivalents and restricted cash	(9,516)	3,715	4,179
Cash, cash equivalents and restricted cash at beginning of period	16,965	13,250	9,071
Cash, cash equivalents and restricted cash at end of period	7,449	16,965	13,250
Reconciliation of Cash and Cash Equivalents [Abstract]
Total cash, cash equivalents and restricted cash shown in Statements of Cash Flows	16,965	13,250	9,071
Retail Opportunity Investments Partnership L.P.
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	47,141	42,688	36,430
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	100,838	96,256	88,359
Amortization of deferred financing costs and mortgage premiums, net	1,899	2,026	2,088
Straight-line rent adjustment	(5,380)	(6,176)	(4,560)
Amortization of above and below market rent	(13,965)	(17,078)	(13,847)
Amortization relating to stock based compensation	7,392	6,190	4,916
Provisions for tenant credit losses	1,729	1,191	1,805
Other noncash interest expense	1,674	2,139	2,139
Gain on sale of real estate	(5,890)	0	0
Change in operating assets and liabilities:
Tenant and other receivables	(57)	(2,452)	(4,412)
Prepaid expenses	(1,344)	464	(1,363)
Accounts payable and accrued expenses	(1,622)	456	4,417
Other assets and liabilities, net	(1,497)	3,234	(1,357)
Net cash provided by operating activities	130,918	128,938	114,615
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in real estate	(44,195)	(263,366)	(284,867)
Proceeds from sale of real estate	26,880	0	0
Improvements to properties	(39,240)	(54,097)	(40,758)
Deposits on real estate acquisitions, net	500	(500)	500
Net cash used in investing activities	(56,055)	(317,963)	(325,125)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal repayments on mortgages	(19,612)	(8,848)	(7,816)
Proceeds from draws on credit facility	177,000	327,500	332,500
Payments on credit facility	(164,500)	(282,000)	(370,000)
Proceeds from issuance of Senior Notes	0	250,000	200,000
Proceeds on repayment of promissory note receivable	0	0	6,710
Redemption of OP Units	(3,713)	(150)	(38,820)
Distributions to OP Unitholders	(97,556)	(91,646)	(84,035)
Deferred financing and other costs	0	(3,845)	(266)
Proceeds from the issuance of common stock	25,703	4,481	184,881
Registration expenditures	(570)	(1,225)	(7,097)
Common shares issued under the 2009 Equity Incentive Plan	269	44
Shares withheld for employee taxes	(1,400)	(1,571)	(1,368)
Net cash (used in) provided by financing activities	(84,379)	192,740	214,689
Net (decrease) increase in cash, cash equivalents and restricted cash	(9,516)	3,715	4,179
Cash, cash equivalents and restricted cash at beginning of period	16,965	13,250	9,071
Cash, cash equivalents and restricted cash at end of period	7,449	16,965	13,250
Reconciliation of Cash and Cash Equivalents [Abstract]
Total cash, cash equivalents and restricted cash shown in Statements of Cash Flows	$ 16,965	$ 13,250	$ 9,071

Organization, Basis of Presenta

Organization, Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Organization, Basis of Presentation and Summary of Significant Accounting Policies	Organization, Basis of Presentation and Summary of Significant Accounting Policies Business Retail Opportunity Investments Corp., a Maryland corporation (“ROIC”), is a fully integrated and self-managed real estate investment trust (“REIT”). ROIC specializes in the acquisition, ownership and management of necessity-based community and neighborhood shopping centers on the west coast of the United States anchored by supermarkets and drugstores. ROIC is organized in a traditional umbrella partnership real estate investment trust (“UpREIT”) format pursuant to which Retail Opportunity Investments GP, LLC, its wholly-owned subsidiary, serves as the general partner of, and ROIC conducts substantially all of its business through, its operating partnership subsidiary, Retail Opportunity Investments Partnership, LP, a Delaware limited partnership (the “Operating Partnership”), together with its subsidiaries. Unless otherwise indicated or unless the context requires otherwise, all references to the “Company”, “we,” “us,” “our,” or “our company” refer to ROIC together with its consolidated subsidiaries, including the Operating Partnership. With the approval of its stockholders, ROIC reincorporated as a Maryland corporation on June 2, 2011. ROIC began operations as a Delaware corporation, known as NRDC Acquisition Corp., which was incorporated on July 10, 2007, for the purpose of acquiring assets or operating businesses through a merger, capital stock exchange, stock purchase, asset acquisition or other similar business combination with one or more assets or control of one or more operating businesses. On October 20, 2009, ROIC’s stockholders and warrantholders approved each of the proposals presented at the special meetings of stockholders and warrantholders, respectively, in connection with the transactions contemplated by the Framework Agreement (the “Framework Agreement”) ROIC entered into on August 7, 2009 with NRDC Capital Management, LLC, which, among other things, set forth the steps to be taken by ROIC to continue its business as a corporation that has elected to qualify as a REIT for U.S. federal income tax purposes. ROIC’s only material asset is its ownership of direct or indirect partnership interests in the Operating Partnership and membership interest in Retail Opportunity Investments GP, LLC, which is the sole general partner of the Operating Partnership. As a result, ROIC does not conduct business itself, other than acting as the parent company and issuing equity from time to time. The Operating Partnership holds substantially all the assets of the Company and directly or indirectly holds the ownership interests in the Company’s real estate ventures. The Operating Partnership conducts the operations of the Company’s business and is structured as a partnership with no publicly traded equity. Except for net proceeds from equity issuances by ROIC, which are contributed to the Operating Partnership, the Operating Partnership generates the capital required by the Company’s business through the Operating Partnership’s operations, by the Operating Partnership’s incurrence of indebtedness (directly and through subsidiaries) or through the issuance of operating partnership units (“OP Units”) of the Operating Partnership. Recent Accounting Pronouncements In November 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2016-18, Restricted Cash. ASU No. 2016-18 requires companies to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Additionally, ASU No. 2016-18 requires a disclosure of a reconciliation between the statement of financial position and the statement of cash flows when the balance sheet includes more than one line item for cash, cash equivalents, restricted cash, and restricted cash equivalents. ASU No. 2016-18 is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. The Company adopted ASU No. 2016-18 effective January 1, 2018. The adoption of ASU No. 2016-18 impacted the presentation of cash flows with inclusion of restricted cash flows for each of the presented periods. In January 2017, the FASB issued ASU No. 2017-1, “Business Combinations: Clarifying the Definition of a Business.” The pronouncement changes the definition of a business to assist entities with evaluating when a set of transferred assets and activities is a business. The pronouncement requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities is not a business. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company adopted the provisions of ASU No. 2017-1 effective October 1, 2016. For the period from October 1, 2016 through December 31, 2018, for the Company’s acquisitions it was concluded substantially all of the fair value of the assets acquired with each property acquisition was concentrated in a single identifiable asset and did not meet the definition of a business under ASU No. 2017-1. Acquisition transaction costs associated with these property acquisitions were capitalized to real estate investments. In February 2016, the FASB issued ASU No. 2016-2, “Leases.” ASU No. 2016-2 is expected to result in the recognition of a right-to-use asset and related liability to account for future obligations under ground lease agreements for which the Company is the lessee. In addition, this ASU will require that lessees and lessors capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. Allocated payroll costs and other costs that are incurred regardless of whether the lease is obtained will no longer be capitalized as initial direct costs and instead will be expensed as incurred. As a lessor, under current accounting standards, the Company recognizes rental revenue from its operating leases on a straight-line basis over the respective lease terms. The Company commences recognition of rental revenue at the date the property is ready for its intended use and the tenant takes possession of or controls the physical use of the property. Under current accounting standards, tenant recoveries related to payments of real estate taxes, insurance, utilities, repairs and maintenance, common area expenses, and other operating expenses are considered lease components. The Company recognizes these tenant recoveries as revenue when services are rendered in an amount equal to the related operating expenses incurred that are recoverable under the terms of the applicable lease. Under ASU No. 2016-2, each lease agreement will be evaluated to identify the lease components and nonlease components at lease inception. The total consideration in the lease agreement will be allocated to the lease and nonlease components based on their relative standalone selling prices. Lessors will continue to recognize the lease revenue component using an approach that is substantially equivalent to existing guidance for operating leases (straight-line basis). In July 2018, the FASB issued an amendment to ASU No. 2016-2 that allows lessors to elect, as a practical expedient, not to allocate the total consideration to lease and nonlease 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 related lease component and, the combined single lease component would be classified as an operating lease. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company plans to adopt the provisions of ASU No. 2016-2 effective January 1, 2019 using the modified retrospective approach and expects to elect certain practical expedients permitted under the transition guidance. The Company currently estimates total assets and liabilities will increase approximately $18.0 million upon adoption. Further upon adoption, payroll-related costs that are incurred regardless of whether the lease is obtained will no longer be capitalized as initial direct costs and instead will be expensed as incurred. These costs amounted to approximately $1.3 million during the year ended December 31, 2018 . In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contracts with Customers.” The pronouncement was issued to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements for U.S. GAAP and International Financial Reporting Standards. The pronouncement is effective for reporting periods beginning after December 15, 2017. The Company adopted the provisions of ASU No. 2014-9 effective January 1, 2018 using the modified retrospective approach. The Company evaluated the revenue recognition for all contracts within this scope under existing accounting standards and under ASU No. 2014-9 and confirmed that there were no differences in the amounts recognized or the pattern of recognition. Therefore, the adoption of ASU No. 2014-9 did not result in an adjustment to the Company’s retained earnings on January 1, 2018. Principles of Consolidation The accompanying consolidated financial statements are prepared on the accrual basis in accordance with GAAP. In the opinion of management, the consolidated financial statements include all adjustments necessary, which are of a normal and recurring nature, for the fair presentation of the Company’s financial position and the results of operations and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company and those of its subsidiaries, which are wholly-owned or controlled by the Company. Entities which the Company does not control through its voting interest and entities which are variable interest entities (“VIEs”), but where it is not the primary beneficiary, are accounted for under the equity method. All significant intercompany balances and transactions have been eliminated. The Company follows the FASB guidance for determining whether an entity is a VIE and requires the performance of a qualitative rather than a quantitative analysis to determine the primary beneficiary of a VIE. Under this guidance, an entity would be required to consolidate a VIE if it has (i) the power to direct the activities that most significantly impact the entity’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Effective January 1, 2016, the Company adopted the provisions of ASU No. 2015-2, and as a result, concluded that the Operating Partnership is a VIE. The Company has concluded that because they have both the power and the rights to control the Operating Partnership, they are the primary beneficiary and are required to continue to consolidate the Operating Partnership. A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the consolidated balance sheet and modifies the presentation of net income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the disclosure of contingent assets and liabilities, the reported amounts of assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the periods covered by the financial statements. The most significant assumptions and estimates relate to the purchase price allocations, depreciable lives, revenue recognition and the collectability of tenant receivables, other receivables, notes receivables, the valuation of performance-based restricted stock, and derivatives. Actual results could differ from these estimates. Federal Income Taxes The Company has elected to qualify as a REIT under Sections 856-860 of the Internal Revenue Code (the “Code”). Under those sections, a REIT that, among other things, distributes at least 90% of its REIT taxable income (determined without regard to the dividends paid deduction and excluding net capital gains) and meets certain other qualifications prescribed by the Code, will not be taxed on that portion of its taxable income that is distributed. Although it may qualify as a REIT for U.S. federal income tax purposes, the Company is subject to state income or franchise taxes in certain states in which some of its properties are located. In addition, taxable income from non-REIT activities managed through the Company’s taxable REIT subsidiary (“TRS”), if any, is fully subject to U.S. federal, state and local income taxes. For all periods from inception through September 26, 2013 the Operating Partnership had been an entity disregarded from its sole owner, ROIC, for U.S. federal income tax purposes and as such had not been subject to U.S. federal income taxes. Effective September 27, 2013, the Operating Partnership issued OP Units in connection with the acquisitions of two shopping centers. Accordingly, the Operating Partnership ceased being a disregarded entity and instead is being treated as a partnership for U.S. federal income tax purposes. The Company follows the FASB guidance that defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The FASB also provides guidance on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. The Company records interest and penalties relating to unrecognized tax benefits, if any, as interest expense. As of December 31, 2018 , the statute of limitations for tax years 2015 through and including 2017 remain open for examination by the Internal Revenue Service (“IRS”) and state taxing authorities. ROIC intends to make regular quarterly distributions to holders of its common stock. U.S. federal income tax law generally requires that a REIT distribute annually at least 90% of its REIT taxable income, without regard to the deduction for dividends paid and excluding net capital gains, and that it pay U.S. federal income tax at regular corporate rates to the extent that it annually distributes less than 100% of its net taxable income. ROIC intends to pay regular quarterly dividends to stockholders in an amount not less than its net taxable income, if and to the extent authorized by its board of directors. Before ROIC pays any dividend, whether for U.S. federal income tax purposes or otherwise, it must first meet both its operating requirements and its debt service on debt. If ROIC’s cash available for distribution is less than its net taxable income, it could be required to sell assets or borrow funds to make cash distributions or it may make a portion of the required distribution in the form of a taxable stock distribution or distribution of debt securities. Real Estate Investments All costs related to the improvement or replacement of real estate properties are capitalized. Additions, renovations and improvements that enhance and/or extend the useful life of a property are also capitalized. Expenditures for ordinary maintenance, repairs and improvements that do not materially prolong the normal useful life of an asset are charged to operations as incurred. During the years ended December 31, 2018 and 2017 , capitalized costs related to the improvements or replacement of real estate properties were approximately $40.3 million and $54.5 million , respectively. The Company expenses transaction costs associated with business combinations and unsuccessful property asset acquisitions in the period incurred and capitalizes transaction costs associated with successful property asset acquisitions. In conjunction with the Company’s pursuit and acquisition of real estate investments, the Company expensed acquisition transaction costs during the years ended December 31, 2017 and 2016 of approximately $4,000 and $824,000 , respectively. The Company did not expense any acquisition transaction costs during the year ended December 31, 2018 . The Company evaluates each acquisition of real estate to determine if the acquired property meets the definition of a business and needs to be accounted for as a business combination. Under ASU No. 2017-1, the Company first determines whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets. If this threshold is met, the acquired property does not meet the definition of a business and is accounted for as an asset acquisition. The Company expects that acquisitions of real estate properties will not meet the revised definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets (i.e., land, buildings, and related intangible assets). The Company recognizes the acquisition of real estate properties, including acquired tangible (consisting of land, buildings and improvements), and acquired intangible assets and liabilities (consisting of above-market and below-market leases and acquired in-place leases) at their fair value (for acquisitions meeting the definition of a business) and relative fair value (acquisitions not meeting the definition of a business). The relative fair values used to allocate the cost of an asset acquisition are determined using the same methodologies and assumptions the Company utilizes to determine fair value in a business combination. Acquired lease intangible assets include above-market leases and acquired in-place leases, and acquired lease intangible liabilities represent below-market leases, in the accompanying consolidated balance sheets. The fair value of the tangible assets of an acquired property is determined by valuing the property as if it were vacant, which value is then allocated to land, buildings and improvements based on management’s determination of the relative fair values of these assets. In valuing an acquired property’s intangibles, factors considered by management include an estimate of carrying costs during the expected lease-up periods, and estimates of lost rental revenue during the expected lease-up periods based on management’s evaluation of current market demand. Management also estimates costs to execute similar leases, including leasing commissions, tenant improvements, legal and other related costs. Leasing commissions, legal and other related costs (“lease origination costs”) are classified as deferred charges in the accompanying consolidated balance sheets. The value of in-place leases is measured by the excess of (i) the purchase price paid for a property after adjusting existing in-place leases to market rental rates, over (ii) the estimated fair value of the property as if vacant. Above-market and below-market lease values are recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between the contractual amounts to be received and management’s estimate of market lease rates, measured over the terms of the respective leases that management deemed appropriate at the time of acquisition. Such valuations include a consideration of the non-cancellable terms of the respective leases as well as any applicable renewal periods. The fair values associated with below-market rental renewal options are determined based on the Company’s experience and the relevant facts and circumstances that existed at the time of the acquisitions. The value of the above-market and below-market leases is amortized to rental income, over the terms of the respective leases including option periods, if applicable. The value of in-place leases are amortized to expense over the remaining non-cancellable terms of the respective leases. If a lease were to be terminated prior to its stated expiration, all unamortized amounts relating to that lease would be recognized in operations at that time. Asset Impairment The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the asset to aggregate future net cash flows (undiscounted and without interest) expected to be generated by the asset. If such assets are considered impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceed the fair value. Management does not believe that the value of any of the Company’s real estate investments was impaired at December 31, 2018 or December 31, 2017 . Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed the federally insured limit by the Federal Deposit Insurance Corporation. The Company has not experienced any losses related to these balances. Restricted Cash The terms of the Company’s mortgage loans payable may require the Company to deposit certain replacement and other reserves with its lenders. Such “restricted cash” is generally available only for property-level requirements for which the reserves have been established and is not available to fund other property level or Company level obligations. Revenue Recognition Management has determined that all of the Company’s leases with its various tenants are operating leases. Rental income is generally recognized based on the terms of leases entered into with tenants. In those instances in which the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. When the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin. Minimum rental income from leases with scheduled rent increases is recognized on a straight-line basis over the lease term. Percentage rent is recognized when a specific tenant’s sales breakpoint is achieved. Property operating expense recoveries from tenants of common area maintenance, real estate taxes and other recoverable costs are recognized in the period the related expenses are incurred. Lease incentives are amortized as a reduction of rental revenue over the respective tenant lease terms. Termination fees (included in other income) are fees that the Company has agreed to accept in consideration for permitting certain tenants to terminate their lease prior to the contractual expiration date. The Company recognizes termination fees when the following conditions are met: (a) the termination agreement is executed; (b) the termination fee is determinable; (c) all landlord services pursuant to the terminated lease have been rendered; and (d) collectability of the termination fee is assured. Interest income is recognized as it is earned. Gains or losses on disposition of properties are recorded when the criteria for recognizing such gains or losses under GAAP have been met. The Company must make estimates as to the collectability of its accounts receivable related to base rent, straight-line rent, expense reimbursements and other revenues. Management analyzes accounts receivable by considering tenant creditworthiness, current economic trends, and changes in tenants’ payment patterns when evaluating the adequacy of the allowance for doubtful accounts receivable. The Company also provides an allowance for future credit losses of the deferred straight-line rents receivable. The provision for doubtful accounts at December 31, 2018 and December 31, 2017 was approximately $6.9 million and $6.4 million , respectively. Depreciation and Amortization The Company uses the straight-line method for depreciation and amortization. Buildings are depreciated over the estimated useful lives which the Company estimates to be 39 - 40 years. Property improvements are depreciated over the estimated useful lives that range from 10 to 20 years. Furniture and fixtures are depreciated over the estimated useful lives that range from 3 to 10 years. Tenant improvements are amortized over the shorter of the life of the related leases or their useful life. Deferred Leasing and Financing Costs Costs incurred in obtaining tenant leases (principally leasing commissions and acquired lease origination costs) are amortized ratably over the life of the tenant leases. Costs incurred in obtaining long-term financing are amortized ratably over the related debt agreement. The amortization of deferred leasing and financing costs is included in Depreciation and amortization and Interest expense and other finance expenses, respectively, in the Consolidated Statements of Operations. The unamortized balances of deferred leasing costs included in deferred charges in the Consolidated Balance Sheets as of December 31, 2018 that will be charged to future operations are as follows (in thousands): Lease Origination Costs 2019 $ 7,041 2020 5,802 2021 4,867 2022 4,029 2023 3,098 Thereafter 9,020 $ 33,857 Internal Capitalized Leasing Costs Through December 31, 2018, the Company capitalized a portion of payroll-related costs related to its leasing personnel associated with new leases and lease renewals. These costs are amortized over the life of the respective leases. During the years ended December 31, 2018 , 2017 and 2016 , the Company capitalized approximately $1.3 million , $1.2 million and $1.2 million , respectively, of such payroll-related costs. Beginning January 1, 2019, in accordance with the adoption of ASU No. 2016-2, the Company will begin expensing these costs as incurred. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and tenant receivables. The Company places its cash and cash equivalents in excess of insured amounts with high quality financial institutions. The Company performs ongoing credit evaluations of its tenants and requires tenants to provide security deposits. Earnings Per Share Basic earnings per share (“EPS”) excludes the impact of dilutive shares and is computed by dividing net income by the weighted average number of shares of common stock outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue shares of common stock were exercised or converted into shares of common stock and then shared in the earnings of the Company. For the years ended December 31, 2018 , 2017 and 2016 , basic EPS was determined by dividing net income allocable to common stockholders for the applicable period by the weighted average number of shares of common stock outstanding during such period. Net income during the applicable period is also allocated to the time-based unvested restricted stock as these grants are entitled to receive dividends and are therefore considered a participating security. Time-based unvested restricted stock is not allocated net losses and/or any excess of dividends declared over net income; such amounts are allocated entirely to the common stockholders other than the holders of time-based unvested restricted stock. The performance-based restricted stock grants awarded under the 2009 Equity Incentive Plan described in Note 8 are excluded from the basic EPS calculation, as these units are not participating securities until they vest. The following table sets forth the reconciliation between basic and diluted EPS for ROIC (in thousands, except share data): Year Ended December 31, 2018 2017 2016 Numerator: Net income $ 47,141 $ 42,688 $ 36,430 Less income attributable to non-controlling interests (4,405 ) (4,211 ) (3,676 ) Less earnings allocated to unvested shares (401 ) (319 ) (270 ) Net income available for common stockholders, basic $ 42,335 $ 38,158 $ 32,484 Numerator: Net income $ 47,141 $ 42,688 $ 36,430 Less earnings allocated to unvested shares (401 ) (319 ) (270 ) Net income available for common stockholders, diluted $ 46,740 $ 42,369 $ 36,160 Denominator: Denominator for basic EPS – weighted average common equivalent shares 112,645,490 109,400,123 104,072,222 OP units 11,626,312 12,060,835 11,747,509 Restricted stock awards – performance-based 183,683 153,807 86,996 Stock options 103,408 129,066 133,213 Denominator for diluted EPS – weighted average common equivalent shares 124,558,893 121,743,831 116,039,940 Earnings Per Unit The following table sets forth the reconciliation between basic and diluted earnings per unit for the Operating Partnership (in thousands, except unit data): Year Ended December 31, 2018 2017 2016 Numerator: Net income $ 47,141 $ 42,688 $ 36,430 Less earnings allocated to unvested shares (401 ) (319 ) (270 ) Net income available to unitholders, basic and diluted $ 46,740 $ 42,369 $ 36,160 Denominator: Denominator for basic earnings per unit – weighted average common equivalent units 124,271,802 121,460,958 115,819,731 Restricted stock awards – performance-based 183,683 153,807 86,996 Stock options 103,408 129,066 133,213 Denominator for diluted earnings per unit – weighted average common equivalent units 124,558,893 121,743,831 116,039,940 Stock-Based Compensation The Company has a stock-based employee compensation plan, which is more fully described in Note 8. The Company accounts for its stock-based compensation plan based on the FASB guidance which requires that compensation expense be recognized based on the fair value of the stock awards less estimated forfeitures. Restricted stock grants vest based upon the completion of a service period (“time based grants”) and/or the Company meeting certain established market specific financial performance criteria (“performance based grants”). Time based grants are valued according to the market price for the Company’s common stock at the date of grant. For performance based grants, a Monte Carlo valuation model is used, taking into account the underlying contingency risks associated with the performance criteria. It is the Company’s policy to grant options with an exercise price equal to the quoted closing market price of stock on the grant date. Awards of stock options and time based grants of stock are expensed as compensation on a straight-line basis over the vesting period. Awards of performance-based grants are expensed as compensation under the accelerated attribution method and are recognized in income regardless of the results of the performance criteria. Derivatives The Company records all derivatives on the balance sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of th

Real Estate Investments

Real Estate Investments	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Real Estate Investments	Real Estate Investments The following real estate investment transactions occurred during the years ended December 31, 2018 and 2017 . Property Asset Acquisitions in 2018 The Company evaluated each of the following acquisitions and determined that substantially all of the fair value related to each acquisition was concentrated in a single identifiable asset. In each of these acquisitions, the Company allocated the total consideration for each acquisition to the individual assets and liabilities acquired on a relative fair value basis. All transaction costs incurred in these acquisitions were capitalized. On February 23, 2018, the Company acquired the property known as Stadium Center located in Tacoma, Washington, within the Seattle metropolitan area, for an adjusted purchase price of approximately $19.3 million . Stadium Center is approximately 49,000 square feet and is anchored by Thriftway Supermarket. The property was acquired with borrowings under the credit facility and restricted cash that was previously held by a qualified intermediary for the acquisition of a replacement property in a tax-free exchange under Section 1031 of the Code. On May 18, 2018, the Company acquired the property known as King City Plaza located in King City, Oregon, within the Portland metropolitan area, for an adjusted purchase price of approximately $15.7 million . King City Plaza is approximately 63,000 square feet and is anchored by Grocery Outlet Supermarket. The property was acquired with borrowings under the credit facility. Property Asset Acquisitions in 2017 During the year ended December 31, 2017 , the Company acquired ten properties throughout the west coast with a total of approximately 1.1 million square feet for a net adjusted purchase price of approximately $313.0 million . The Company evaluated each of the following acquisitions and determined that substantially all of the fair value related to each acquisition was concentrated in a single identifiable asset. In each of these acquisitions, the Company allocated the total consideration for each acquisition to the individual assets and liabilities acquired on a relative fair value basis. Any reference to square footage or occupancy is unaudited and outside the scope of our independent registered public accounting firm’s audit of the Company’s financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board. The financial information set forth below summarizes the Company’s purchase price allocation for the properties acquired during the years ended December 31, 2018 and 2017 (in thousands). December 31, 2018 December 31, 2017 Assets Land $ 7,666 $ 123,203 Building and improvements 35,629 251,277 Acquired lease intangible asset 1,763 24,766 Deferred charges 818 9,196 Assets acquired $ 45,876 $ 408,442 Liabilities Mortgage notes assumed $ — $ 46,801 Acquired lease intangible liability 1,680 48,684 Liabilities assumed $ 1,680 $ 95,485 The following table summarizes the operating results included in the Company’s historical consolidated statement of operations for the year ended December 31, 2018 for the properties acquired during the year ended December 31, 2018 (in thousands). Year Ended December 31, 2018 Statement of operations: Revenues $ 2,343 Net income attributable to Retail Opportunity Investments Corp. $ 753 The following table summarizes the operating results included in the Company’s historical consolidated statement of operations for the year ended December 31, 2017 for the properties acquired during the year ended December 31, 2017 (in thousands). Year Ended December 31, 2017 Statement of operations: Revenues $ 13,500 Net income attributable to Retail Opportunity Investments Corp. $ 2,948 Property Dispositions On September 27, 2018, the Company sold Round Hill Square, a non-core shopping center located in Zephyr Cove, Nevada. The sales price of $28.0 million , less costs to sell, resulted in net proceeds of approximately $26.9 million . The Company recorded a gain on sale of real estate of approximately $5.9 million during the year ended December 31, 2018 related to this property disposition.

Acquired Lease Intangibles

Acquired Lease Intangibles	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired Lease Intangibles	Acquired Lease Intangibles Intangible assets and liabilities as of December 31, 2018 and 2017 consisted of the following (in thousands): December 31, 2018 December 31, 2017 Assets: In-place leases $ 92,354 $ 99,924 Accumulated amortization (36,835 ) (36,971 ) Above-market leases 30,093 33,176 Accumulated amortization (13,503 ) (13,351 ) Acquired lease intangible assets, net $ 72,109 $ 82,778 Liabilities: Below-market leases $ 217,212 $ 222,929 Accumulated amortization (51,066 ) (43,945 ) Acquired lease intangible liabilities, net $ 166,146 $ 178,984 For the years ended December 31, 2018 , 2017 and 2016 , the net amortization of acquired lease intangible assets and acquired lease intangible liabilities for above and below market leases was $14.0 million , $17.1 million and $13.8 million , respectively, which amounts are included in base rents in the accompanying consolidated statements of operations and comprehensive income. For the years ended December 31, 2018 , 2017 and 2016 , the net amortization of in-place leases was $11.4 million , $14.4 million and $15.6 million , respectively, which amounts are included in depreciation and amortization in the accompanying consolidated statements of operations and comprehensive income. The scheduled future amortization of acquired lease intangible assets as of December 31, 2018 is as follows (in thousands): Year Ending December 31: 2019 $ 10,573 2020 8,566 2021 6,898 2022 5,705 2023 5,092 Thereafter 35,275 Total future amortization of acquired lease intangible assets $ 72,109 The scheduled future amortization of acquired lease intangible liabilities as of December 31, 2018 is as follows (in thousands): Year Ending December 31: 2019 $ 14,675 2020 13,347 2021 12,075 2022 11,005 2023 9,999 Thereafter 105,045 Total future amortization of acquired lease intangible liabilities $ 166,146

Tenant Leases

Tenant Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Tenant Leases	Tenant Leases Space in the Company’s shopping centers is leased to various tenants under operating leases that usually grant tenants renewal options and generally provide for additional rents based on certain operating expenses as well as tenants’ sales volume. Future minimum rents to be received under non-cancellable leases as of December 31, 2018 are summarized as follows (in thousands): Year Ending December 31: 2019 $ 198,998 2020 181,234 2021 160,082 2022 134,368 2023 105,657 Thereafter 429,172 Total minimum lease payments $ 1,209,511

Mortgage Notes Payable, Credit

Mortgage Notes Payable, Credit Facilities and Senior Notes	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Mortgage Notes Payable, Credit Facilities and Senior Notes	Mortgage Notes Payable, Credit Facilities and Senior Notes ROIC does not hold any indebtedness. All debt is held directly or indirectly by the Operating Partnership; however, ROIC has guaranteed the Operating Partnership’s term loan, unsecured revolving credit facility, carve-out guarantees on property-level debt, the Senior Notes Due 2027, the Senior Notes Due 2026, the Senior Notes Due 2024 and the Senior Notes Due 2023. Mortgage Notes Payable On February 1, 2018, the Company repaid in full the Santa Teresa Village mortgage note related to Santa Teresa Village for a total of approximately $10.1 million , without penalty, in accordance with the prepayment provisions of the note. On September 28, 2018, the Company repaid in full the Magnolia Shopping Center mortgage note related to Magnolia Shopping Center for a total of approximately $ 8.8 million , without penalty, in accordance with the repayment provisions of the note. The mortgage notes payable collateralized by respective properties and assignment of leases at December 31, 2018 and December 31, 2017 , respectively, were as follows (in thousands, except interest rates): Property Maturity Date Interest Rate December 31, 2018 December 31, 2017 Santa Teresa Village February 2018 6.200 % $ — $ 10,138 Magnolia Shopping Center October 2018 5.500 % — 8,951 Casitas Plaza Shopping Center June 2022 5.320 % 7,158 7,307 Riverstone Marketplace July 2022 4.960 % 18,050 18,424 Fullerton Crossroads April 2024 4.728 % 26,000 26,000 Diamond Hills Plaza October 2025 3.550 % 35,500 35,500 $ 86,708 $ 106,320 Mortgage premiums 2,074 1,921 Net unamortized deferred financing costs (271 ) (326 ) Total mortgage notes payable $ 88,511 $ 107,915 The combined aggregate principal maturities of mortgage notes payable during the next five years and thereafter are as follows (in thousands): Principal Repayments Scheduled Amortization Mortgage Premium Total 2019 $ — $ 551 $ 481 $ 1,032 2020 — 577 481 1,058 2021 — 717 481 1,198 2022 23,129 1,003 344 24,476 2023 — 686 216 902 Thereafter 58,787 1,258 71 60,116 Total $ 81,916 $ 4,792 $ 2,074 $ 88,782 Term Loan and Credit Facility The carrying values of the Company’s unsecured term loan (the “term loan”) were as follows (in thousands): December 31, 2018 December 31, 2017 Term loan $ 300,000 $ 300,000 Net unamortized deferred financing costs (924 ) (1,184 ) Term loan $ 299,076 $ 298,816 On September 29, 2015, the Company entered into an unsecured term loan agreement under which the lenders agreed to provide a $300.0 million unsecured term loan facility. Effective September 8, 2017, the Company entered into a First Amended and Restated Term Loan Agreement (the “Term Loan Agreement”) pursuant to which the maturity date of the term loan was extended from January 31, 2019 to September 8, 2022 , without further options for extension. The Term Loan Agreement also provides that the Company may from time to time request increased aggregate commitments of $200.0 million under certain conditions set forth in the Term Loan Agreement, including the consent of the lenders for the additional commitments. Borrowings under the Term Loan Agreement accrue interest on the outstanding principal amount at a rate equal to an applicable rate based on the credit rating level of the Company, plus, as applicable, (i) a LIBOR rate determined by reference to the cost of funds for U.S. dollar deposits for the relevant period (the “Eurodollar Rate”), or (ii) a base rate determined by reference to the highest of (a) the federal funds rate plus 0.50% , (b) the rate of interest announced by the Administrative Agent as its “prime rate,” and (c) the Eurodollar Rate plus 1.10% . The carrying values of the Company’s unsecured revolving credit facility were as follows (in thousands): December 31, 2018 December 31, 2017 Credit facility $ 156,000 $ 143,500 Net unamortized deferred financing costs (2,311 ) (3,171 ) Credit facility $ 153,689 $ 140,329 The Operating Partnership has an unsecured revolving credit facility with several banks. Effective September 8, 2017, the Company entered into a Second Amended and Restated Credit Agreement (the “Credit Facility Agreement”) pursuant to which the borrowing capacity under the credit facility was increased from $500.0 million to $600.0 million . The maturity date of the credit facility was extended from January 31, 2019 to September 8, 2021 , with two six-month extension options, which may be exercised by the Operating Partnership upon satisfaction of certain conditions including the payment of extension fees. Additionally, the credit facility contains an accordion feature, which allows the Operating Partnership to increase the borrowing capacity under the credit facility up to an aggregate of $1.2 billion , subject to lender consents and other conditions. Borrowings under the credit facility accrue interest on the outstanding principal amount at a rate equal to an applicable rate based on the credit rating level of the Company, plus, as applicable, (i) the Eurodollar Rate, or (ii) a base rate determined by reference to the highest of (a) the federal funds rate plus 0.50% , (b) the rate of interest announced by KeyBank, National Association as its “prime rate,” and (c) the Eurodollar Rate plus 1.00% . Additionally, the Operating Partnership is obligated to pay a facility fee at a rate based on the credit rating level of the Company, currently 0.20% , and a fronting fee at a rate of 0.125% per year with respect to each letter of credit issued under the credit facility. The Company has investment grade credit ratings from Moody’s Investors Service (Baa2) and Standard & Poor’s Ratings Services (BBB-). Both the term loan and credit facility contain customary representations, financial and other covenants. The Operating Partnership’s ability to borrow under the term loan and credit facility are subject to its compliance with financial covenants and other restrictions on an ongoing basis. The Operating Partnership was in compliance with such covenants at December 31, 2018 . As of December 31, 2018 , $300.0 million and $156.0 million were outstanding under the term loan and credit facility, respectively. The average interest rates on the term loan and the credit facility during the year ended December 31, 2018 were 3.1% and 3.0% , respectively. The Company had no available borrowings under the term loan at December 31, 2018 . The Company had $444.0 million available to borrow under the credit facility at December 31, 2018 . Senior Notes Due 2027 The carrying value of the Company’s unsecured Senior Notes Due 2027 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 250,000 $ 250,000 Net unamortized deferred financing costs (1,123 ) (1,249 ) Senior Notes Due 2027 $ 248,877 $ 248,751 On November 10, 2017, the Operating Partnership entered into a Note Purchase Agreement which provided for the issuance of $250.0 million principal amount of 4.19% Senior Notes Due 2027 (the “Senior Notes Due 2027”) in a private placement effective December 15, 2017. The Senior Notes Due 2027 pay interest on June 15 and December 15 of each year, commencing on June 15, 2018, and mature on December 15, 2027, unless prepaid earlier by the Operating Partnership. The Operating Partnership’s performance of the obligations under the Note Purchase Agreement, including the payment of any outstanding indebtedness thereunder, are guaranteed, jointly and severally, by ROIC. The net proceeds were used to reduce borrowings under the credit facility. Senior Notes Due 2026 The carrying value of the Company’s unsecured Senior Notes Due 2026 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 200,000 $ 200,000 Net unamortized deferred financing costs (219 ) (248 ) Senior Notes Due 2026 $ 199,781 $ 199,752 On July 26, 2016, the Operating Partnership entered into a Note Purchase Agreement, as amended, which provided for the issuance of $200.0 million principal amount of 3.95% Senior Notes Due 2026 (the “Senior Notes Due 2026”) in a private placement effective September 22, 2016. The Senior Notes Due 2026 pay interest on March 22 and September 22 of each year, commencing on March 22, 2017, and mature on September 22, 2026, unless prepaid earlier by the Operating Partnership. The Operating Partnership’s performance of the obligations under the Note Purchase Agreement, including the payment of any outstanding indebtedness thereunder, are guaranteed, jointly and severally, by ROIC. The net proceeds were used to reduce borrowings under the credit facility. Senior Notes Due 2024 The carrying value of the Company’s unsecured Senior Notes Due 2024 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 250,000 $ 250,000 Unamortized debt discount (2,252 ) (2,578 ) Net unamortized deferred financing costs (1,314 ) (1,535 ) Senior Notes Due 2024 $ 246,434 $ 245,887 On December 3, 2014, the Operating Partnership completed a registered underwritten public offering of $250.0 million aggregate principal amount of 4.000% Senior Notes due 2024 (the “Senior Notes Due 2024”), fully and unconditionally guaranteed by ROIC. The Senior Notes Due 2024 pay interest semi-annually on June 15 and December 15, commencing on June 15, 2015, and mature on December 15, 2024, unless redeemed earlier by the Operating Partnership. The Senior Notes Due 2024 are the Operating Partnership’s senior unsecured obligations that rank equally in right of payment with the Operating Partnership’s other unsecured indebtedness, and effectively junior to (i) all of the indebtedness and other liabilities, whether secured or unsecured, and any preferred equity of the Operating Partnership’s subsidiaries, and (ii) all of the Operating Partnership’s indebtedness that is secured by its assets, to the extent of the value of the collateral securing such indebtedness outstanding. ROIC fully and unconditionally guaranteed the Operating Partnership’s obligations under the Senior Notes Due 2024 on a senior unsecured basis, including the due and punctual payment of principal of, and premium, if any, and interest on, the notes, whether at stated maturity, upon acceleration, notice of redemption or otherwise. The guarantee is a senior unsecured obligation of ROIC and ranks equally in right of payment with all other senior unsecured indebtedness of ROIC. ROIC’s guarantee of the Senior Notes Due 2024 is effectively subordinated in right of payment to all liabilities, whether secured or unsecured, and any preferred equity of its subsidiaries (including the Operating Partnership and any entity ROIC accounts for under the equity method of accounting). Senior Notes Due 2023 The carrying value of the Company’s unsecured Senior Notes Due 2023 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 250,000 $ 250,000 Unamortized debt discount (2,339 ) (2,737 ) Net unamortized deferred financing costs (1,304 ) (1,567 ) Senior Notes Due 2023 $ 246,357 $ 245,696 On December 9, 2013, the Operating Partnership completed a registered underwritten public offering of $250.0 million aggregate principal amount of 5.000% Senior Notes due 2023 (the “Senior Notes Due 2023”), fully and unconditionally guaranteed by ROIC. The Senior Notes Due 2023 pay interest semi-annually on June 15 and December 15, commencing on June 15, 2014, and mature on December 15, 2023, unless redeemed earlier by the Operating Partnership. The Senior Notes Due 2023 are the Operating Partnership’s senior unsecured obligations that rank equally in right of payment with the Operating Partnership’s other unsecured indebtedness, and effectively junior to (i) all of the indebtedness and other liabilities, whether secured or unsecured, and any preferred equity of the Operating Partnership’s subsidiaries, and (ii) all of the Operating Partnership’s indebtedness that is secured by its assets, to the extent of the value of the collateral securing such indebtedness outstanding. ROIC fully and unconditionally guaranteed the Operating Partnership’s obligations under the Senior Notes Due 2023 on a senior unsecured basis, including the due and punctual payment of principal of, and premium, if any, and interest on, the notes, whether at stated maturity, upon acceleration, notice of redemption or otherwise. The guarantee is a senior unsecured obligation of ROIC and will rank equally in right of payment with all other senior unsecured indebtedness of ROIC. ROIC’s guarantee of the Senior Notes Due 2023 is effectively subordinated in right of payment to all liabilities, whether secured or unsecured, and any preferred equity of its subsidiaries (including the Operating Partnership and any entity ROIC accounts for under the equity method of accounting). The combined aggregate principal maturities of the Company’s unsecured senior notes payable during the next five years and thereafter are as follows (in thousands): Principal Repayments 2019 $ — 2020 — 2021 — 2022 — 2023 250,000 Thereafter 700,000 Total $ 950,000 Deferred Financing Costs The unamortized balances of deferred financing costs associated with the Company’s term loan, unsecured revolving credit facility, Senior Notes Due 2027, Senior Notes Due 2026, Senior Notes Due 2024, Senior Notes Due 2023, and mortgage notes payable included as a direct reduction from the carrying amount of the related debt instrument in the Consolidated Balance Sheets as of December 31, 2018 that will be charged to future operations during the next five years and thereafter are as follows (in thousands): Financing Costs 2019 $ 1,791 2020 1,791 2021 1,522 2022 848 2023 663 Thereafter 851 $ 7,466

Preferred Stock of ROIC

Preferred Stock of ROIC	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Preferred Stock of ROIC	Preferred Stock of ROIC The Company is authorized to issue 50,000,000 shares of preferred stock with such designations, voting and other rights and preferences as may be determined from time to time by the board of directors. As of December 31, 2018 and 2017 , there were no shares of preferred stock outstanding.

Common Stock of ROIC

Common Stock of ROIC	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Common Stock of ROIC	Common Stock of ROIC Equity Issuance In connection with the acquisitions of two properties during the year ended December 31, 2017 , a portion of the consideration for the properties was funded through the issuance of 2,405,430 OP Units. On December 12, 2017, the Company issued 2,584,254 shares of common stock, at a price per share of $21.25 , in exchange for the 2,405,430 OP Units previously issued and the rights to approximately $3.8 million of cash to be used to acquire a third property to be identified by the Company. The proceeds of approximately $3.8 million were classified in Restricted Cash in the consolidated balance sheet as of December 31, 2017 , as the proceeds were being held with an exchange accommodator under Section 1031 of the Code, and were used to purchase replacement assets during the year ended December 31, 2018 . The shares of common stock of the Company were issued in a private placement in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder. On July 12, 2016, ROIC issued 6,555,000 shares of common stock in a registered public offering, including shares issued upon the exercise in full of the underwriters’ option to purchase additional shares, resulting in net proceeds of approximately $133.0 million , after deducting the underwriters’ discounts and commissions and offering expenses. The net proceeds were used to reduce borrowings under the Operating Partnership’s revolving credit facility. ATM On May 1, 2018, ROIC entered into five separate Sales Agreements (the “Sales Agreements”) with each of Capital One Securities, Inc., Jefferies LLC, KeyBanc Capital Markets Inc., Raymond James & Associates, Inc., and Robert W. Baird & Co. Incorporated (each individually, an “Agent” and collectively, the “Agents”) pursuant to which ROIC may sell, from time to time, shares of ROIC’s common stock, par value $0.0001 per share, having an aggregate offering price of up to $250.0 million through the Agents either as agents or principals. In addition, on April 30, 2018, the Company terminated sales agreements with Jefferies, KeyBanc and Raymond James, dated as of September 19, 2014 and with Baird, dated as of May 23, 2016 (the “Prior Sales Agreements”), which the Company entered into in connection with its prior “at the market” offering. During the year ended December 31, 2018 , ROIC sold a total of 1,251,376 shares under the Sales Agreements, which resulted in gross proceeds of approximately $24.2 million and commissions of approximately $242,000 paid to the Agents. During the year ended December 31, 2018 , ROIC sold a total of 75,314 shares of common stock under the Prior Sales Agreements, which resulted in gross proceeds of approximately $1.5 million and commissions of approximately $19,000 paid to the Agents. During the year ended December 31, 2017 , ROIC sold a total of 34,001 shares under the Prior Sales Agreements, which resulted in gross proceeds of approximately $681,000 and commissions of approximately $9,000 paid to the Agents. Stock Repurchase Program On July 31, 2013, ROIC’s board of directors authorized a stock repurchase program to repurchase up to a maximum of $50.0 million of the Company’s common stock. Through the year ended December 31, 2018 , the Company has not repurchased any shares of common stock under this program.

Stock Compensation and Other Be

Stock Compensation and Other Benefit Plans for ROIC	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation and Other Benefit Plans for ROIC	Stock Compensation and Other Benefit Plans for ROIC ROIC follows the FASB guidance related to stock compensation which establishes financial accounting and reporting standards for stock-based employee compensation plans, including all arrangements by which employees receive shares of stock or other equity instruments of the employer, or the employer incurs liabilities to employees in amounts based on the price of the employer’s stock. The guidance also defines a fair value-based method of accounting for an employee stock option or similar equity instrument. In 2009, the Company adopted the 2009 Equity Incentive Plan. The 2009 Equity Incentive Plan provided for grants of restricted common stock and stock option awards up to an aggregate of 7.5% of the issued and outstanding shares of ROIC’s common stock at the time of the award, subject to a ceiling of 4,000,000 shares. The Company’s Annual Meeting of Stockholders was held on April 25, 2018 at which time the stockholders of the Company approved the Company’s Amended and Restated 2009 Equity Incentive Plan (the “Equity Incentive Plan”). The types of awards that may be granted under the Equity Incentive Plan include stock options, restricted shares, share appreciation rights, phantom shares, dividend equivalent rights and other equity-based awards. The Equity Incentive Plan has a fungible unit system that counts the number of shares of the Company’s common stock used in the issuance of full-value awards, such as restricted shares, differently than the number of shares of common stock used in the issuance of stock options. A total of 22,500,000 Fungible Units (as defined in the Equity Incentive Plan) are reserved for grant under the Equity Incentive Plan and the Fungible Unit-to-full-value award conversion ratio is 6.25 to 1.0. The Equity Incentive Plan will expire on April 25, 2028. Any available shares that had not been granted under the 2009 Equity Incentive Plan were rolled over and made available for issuance under the Equity Incentive Plan. Restricted Stock During the year ended December 31, 2018 , ROIC awarded 514,972 shares of restricted common stock under the 2009 Equity Incentive Plan, of which 180,200 shares are performance-based grants and the remainder of the shares are time based grants. The performance-based grants vest based on pre-defined market-specific performance criteria with a vesting date on January 1, 2021. A summary of the status of the Company’s non-vested restricted stock awards as of December 31, 2018 , and changes during the year ended December 31, 2018 are presented below: Shares Weighted Average Non-vested as of December 31, 2017 781,467 $ 18.14 Granted 514,972 $ 15.85 Vested (274,608 ) $ 18.46 Forfeited (18,996 ) $ 17.75 Non-vested as of December 31, 2018 1,002,835 $ 16.88 As of December 31, 2018 , there remained a total of approximately $7.5 million of unrecognized restricted stock compensation related to outstanding non-vested restricted stock grants awarded under the 2009 Equity Incentive Plan. Restricted stock compensation is expected to be expensed over a remaining weighted average period of 1.7 years (irrespective of achievement of the performance conditions). The total fair value of restricted stock that vested during the years ended December 31, 2018 , 2017 and 2016 was $5.5 million , $6.3 million and $5.6 million , respectively. Stock Based Compensation Expense For the years ended December 31, 2018 , 2017 and 2016 , the amounts charged to expense for all stock based compensation totaled approximately $7.4 million , $6.2 million and $4.9 million , respectively. Profit Sharing and Savings Plan During 2011, the Company established a profit sharing and savings plan (the “401K Plan”), which permits eligible employees to defer a portion of their compensation in accordance with the Code. Under the 401K Plan, the Company made matching contributions on behalf of eligible employees. The Company made contributions to the 401K Plan of approximately $86,000 , $70,000 and $76,000 for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Capital of the Operating Partne

Capital of the Operating Partnership	12 Months Ended
	Dec. 31, 2018
Partners' Capital Notes [Abstract]
Capital of the Operating Partnership	Capital of the Operating Partnership As of December 31, 2018 , the Operating Partnership had 125,469,878 OP Units outstanding. ROIC owned an approximate 90.8% interest in the Operating Partnership at December 31, 2018 , or 113,992,837 OP Units. The remaining 11,477,041 OP Units are owned by other limited partners. A share of ROIC’s common stock and the OP Units have essentially the same economic characteristics as they share equally in the total net income or loss and distributions of the Operating Partnership. As of December 31, 2018 , subject to certain exceptions, holders are able to redeem their OP Units, at the option of ROIC, for cash or for unregistered shares of ROIC common stock on a one-for-one basis. If cash is paid in the redemption, the redemption price is equal to the average closing price on the NASDAQ Stock Market for shares of ROIC’s common stock over the ten consecutive trading days immediately preceding the date a redemption notice is received by ROIC. During the year ended December 31, 2018 , ROIC received notices of redemption for a total of 201,950 OP Units. ROIC elected to redeem the 201,950 OP Units in cash, and accordingly, a total of of ROIC common stock on a one-for-one basis, and accordingly, a total of approximately $3.7 million was paid during the year ended December 31, 2018 to the holders of the respective OP Units. The redemption value of the OP Units owned by the limited partners as of December 31, 2018 , not including ROIC, had such units been redeemed at December 31, 2018 , was approximately $187.9 million , calculated based on the average closing price on the NASDAQ Stock Market of ROIC common stock for the ten consecutive trading days immediately preceding December 31, 2018 , which amounted to $16.37 per share. Retail Opportunity Investments GP, LLC, ROIC’s wholly-owned subsidiary, is the sole general partner of the Operating Partnership, and as the parent company, ROIC has the full and complete authority over the Operating Partnership’s day-to-day management and control. As the sole general partner of the Operating Partnership, ROIC effectively controls the ability to issue common stock of ROIC upon redemption of any OP Units. The redemption provisions that permit ROIC to settle the redemption of OP Units in either cash or common stock, in the sole discretion of ROIC, are further evaluated in accordance with applicable accounting guidance to determine whether temporary or permanent equity classification on the balance sheet is appropriate. The Company evaluated this guidance, including the ability, in its sole discretion, to settle in unregistered shares of common stock, and determined that the OP Units meet the requirements to qualify for presentation as permanent equity.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company follows the FASB guidance that defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. The guidance applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements; accordingly, the standard does not require any new fair value measurements of reported balances. The 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, the guidance 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). 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. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), 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. The following disclosures of estimated fair value were determined by management, using available market information and appropriate valuation methodologies as discussed in Note 1. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts realizable upon disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts. The carrying values of cash and cash equivalents, restricted cash, tenant and other receivables, deposits, prepaid expenses, other assets, accounts payable and accrued expenses are reasonable estimates of their fair values because of the short-term nature of these instruments. The carrying values of the term loan and revolving credit facility are deemed to be at fair value since the outstanding debt is directly tied to monthly LIBOR contracts. The fair value of the outstanding Senior Notes Due 2027 and Senior Notes Due 2026 at December 31, 2018 was approximately $223.7 million and $178.4 million , respectively, calculated using significant inputs which are not observable in the market, or Level 3. The fair value of the outstanding Senior Notes Due 2024 and Senior Notes Due 2023 at December 31, 2018 was approximately $236.9 million and $249.3 million , respectively, based on inputs not quoted on active markets, but corroborated by market data, or Level 2. Assumed mortgage notes payable were recorded at their fair value at the time they were assumed. The Company’s outstanding mortgage notes payable were estimated to have a fair value of approximately $86.3 million with an interest rate range of 4.2% to 4.4% and a weighted average interest rate of 4.3% as of December 31, 2018 . These fair value measurements fall within Level 3 of the fair value hierarchy.

Derivative and Hedging Activiti

Derivative and Hedging Activities	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities The Company’s objectives in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges 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 following is a summary of the terms of the Company’s current interest rate swaps as of December 31, 2018 (in thousands): Swap Counterparty Notional Amount Effective Date Maturity Date Interest Rate Swap Agreements: Bank of Montreal $ 50,000 1/29/2016 1/31/2019 Regions Bank $ 50,000 2/29/2016 1/31/2019 Bank of Montreal $ 100,000 12/29/2017 8/31/2022 U.S. Bank $ 100,000 12/29/2017 8/31/2022 Forward Starting Interest Rate Swap Agreements: Regions Bank $ 50,000 1/31/2019 8/31/2022 Royal Bank of Canada $ 50,000 1/31/2019 8/31/2022 The changes in the fair value of derivatives that are designated as cash flow hedges are recorded in accumulated other comprehensive income (“AOCI”) and will be subsequently reclassified into earnings during the period in which the hedged forecasted transaction affects earnings. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of the derivative. This analysis reflects the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves, and implied volatilities. The fair value of interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The Company incorporated credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparties non-performance risk in the fair value measurements. In adjusting the fair value of its derivative contract for the effect of non-performance risk, the Company 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 the Company and its counterparties. However, as of December 31, 2018 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative position 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 valuation in its entirety is classified in Level 2 of the fair value hierarchy. The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands). Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total December 31, 2018: Assets Derivative financial instruments $ — $ 4,931 $ — $ 4,931 Liabilities Derivative financial instruments $ — $ (580 ) $ — $ (580 ) December 31, 2017 Assets Derivative financial instruments $ — $ 4,321 $ — $ 4,321 Amounts paid, or received, to cash settle interest rate derivatives prior to their maturity date are recorded in AOCI at the cash settlement amount, and will be reclassified to interest expense as interest expense is recognized on the hedged debt. During the next twelve months, the Company estimates that $1.2 million will be reclassified as an increase to interest expense related to the Company’s four outstanding swap arrangements and it’s previously cash-settled swap arrangements. The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet as of December 31, 2018 and 2017 , respectively (in thousands): Derivatives designed as hedging instruments Balance sheet location December 31, 2018 Fair Value December 31, 2017 Fair Value Interest rate products Other assets $ 4,931 $ 4,321 Interest rate products Other liabilities $ (580 ) $ — Derivatives in Cash Flow Hedging Relationships The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the years ended December 31, 2018 , 2017 , and 2016 , respectively (in thousands). Amounts reclassified from other comprehensive income (“OCI”) due to ineffectiveness are recognized as interest expense. Year Ended December 31, 2018 2017 2016 Amount of gain recognized in OCI on derivatives $ 1,648 $ 3,665 $ 541 Amount of loss reclassified from AOCI into interest $ 57 $ 1,920 $ 2,473

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the normal course of business, from time to time, the Company is involved in legal actions relating to the ownership and operations of its properties. In management’s opinion, the liabilities, if any, that ultimately may result from such legal actions are not expected to have a material adverse effect on the consolidated financial position, results of operations or liquidity of the Company. The Company has signed several ground leases for certain properties. For financial reporting purposes, rent expense is recognized on a straight-line basis over the term of the lease. Accordingly, rent expense recognized in excess of rent paid is reflected as a liability in the accompanying consolidated balance sheets. Rent expense, for both ground leases and corporate office storage space, was approximately $2.0 million , $1.5 million , and $831,000 for the years ended December 31, 2018 , 2017 , and 2016 , respectively. The following table represents the Company’s future minimum annual lease payments under operating leases as of December 31, 2018 (in thousands): Operating Leases 2019 $ 1,280 2020 1,287 2021 1,283 2022 1,304 2023 1,330 Thereafter 33,939 Total minimum lease payments $ 40,423 Tax Protection Agreements In connection with certain acquisitions from September 2013 through March 2017, the Company entered into Tax Protection Agreements with certain limited partners of the Operating Partnership. The Tax Protection Agreements require the Company, subject to certain exceptions, to indemnify the respective sellers receiving OP Units against certain tax liabilities incurred by them, as calculated pursuant to the respective Tax Protection Agreements, for a period of 12 years (with respect to Tax Protection Agreements entered into in September 2013), or 10 years (with respect to Tax Protection Agreements entered into from December 2014 through March 2017) from the date of the Tax Protection Agreements. If the Company were to trigger the tax protection provisions under these agreements, the Company would be required to pay damages in the amount of the taxes owed by these limited partners (plus additional damages in the amount of the taxes incurred as a result of such payment).

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has entered into several lease agreements with an officer of the Company, whereby pursuant to the lease agreements, the Company is provided the use of storage space. For the years ended December 31, 2018 , 2017 , and 2016 , the Company incurred approximately $74,000 , $52,000 and $46,000 , respectively, of expenses relating to the agreements which were included in general and administrative expenses in the accompanying consolidated statements of operations and other comprehensive income.

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	Quarterly Results of Operations (Unaudited) The unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 for ROIC are as follows (in thousands, except share data): Year Ended December 31, 2018 March 31 June 30 September 30 December 31 Total revenues $ 74,395 $ 72,341 $ 73,904 $ 75,158 Net income $ 11,824 $ 8,102 $ 15,647 $ 11,568 Net income attributable to ROIC $ 10,702 $ 7,339 $ 14,194 $ 10,501 Basic and diluted income per share $ 0.09 $ 0.06 $ 0.12 $ 0.09 Year Ended December 31, 2017 March 31 June 30 September 30 December 31 Total revenues $ 65,900 $ 66,640 $ 67,966 $ 72,754 Net income $ 11,251 $ 9,197 $ 10,127 $ 12,113 Net income attributable to ROIC $ 10,170 $ 8,309 $ 9,149 $ 10,849 Basic and diluted income per share $ 0.09 $ 0.08 $ 0.08 $ 0.10 The unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 for the Operating Partnership are as follows (in thousands, except unit data): Year Ended December 31, 2018 March 31 June 30 September 30 December 31 Total revenues $ 74,395 $ 72,341 $ 73,904 $ 75,158 Net income attributable to the Operating Partnership $ 11,824 $ 8,102 $ 15,647 $ 11,568 Basic and diluted income per unit $ 0.09 $ 0.06 $ 0.12 $ 0.09 Year Ended December 31, 2017 March 31 June 30 September 30 December 31 Total revenues $ 65,900 $ 66,640 $ 67,966 $ 72,754 Net income attributable to the Operating Partnership $ 11,251 $ 9,197 $ 10,127 $ 12,113 Basic and diluted income per unit $ 0.09 $ 0.08 $ 0.08 $ 0.10

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 15, 2019, the Company sold Vancouver Market Center, a non-core shopping center located in Vancouver, Washington for a sales price of $17.0 million . On February 19, 2019 , the Company’s board of directors declared a cash dividend on its common stock of $0.1970 per share, payable on March 28, 2019 to holders of record on March 14, 2019 .

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]
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure	SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION December 31, 2018 (in thousands) Initial Cost to Company Cost Capitalized Subsequent to Acquisition Amount at Which Carried at Close of Period Description and Location Encumbrances Land Building & Land Building & Land Building & (a) Accumulated Depreciation (b) (1) Date of Acquisition Paramount Plaza, CA $ — $ 6,347 $ 10,274 $ 447 $ 2,227 $ 6,794 $ 12,501 $ 19,295 $ 3,571 12/22/2009 Santa Ana Downtown Plaza, CA — 7,895 9,890 — 3,856 7,895 13,746 21,641 3,281 1/26/2010 Meridian Valley Plaza, WA — 1,881 4,795 — 1,724 1,881 6,519 8,400 1,696 2/1/2010 The Market at Lake Stevens, WA — 3,087 12,397 — 408 3,087 12,805 15,892 3,394 3/16/2010 Norwood Shopping Center, CA — 3,031 11,534 122 1,253 3,153 12,787 15,940 3,419 4/5/2010 Pleasant Hill Marketplace, CA — 6,359 6,927 — 1,590 6,359 8,517 14,876 2,396 4/8/2010 Vancouver Market Center, WA — 4,080 6,912 — 3,981 4,080 10,893 14,973 2,356 6/17/2010 Happy Valley Town Center, OR — 11,678 27,011 — 2,564 11,678 29,575 41,253 7,539 7/14/2010 Cascade Summit Town Square, OR — 8,853 7,732 — 421 8,853 8,153 17,006 2,595 8/20/2010 Heritage Market Center, WA — 6,595 17,399 — 771 6,595 18,170 24,765 4,442 9/23/2010 Claremont Promenade, CA — 5,975 1,019 183 4,402 6,158 5,421 11,579 2,383 9/23/2010 Sycamore Creek, CA — 3,747 11,584 — 582 3,747 12,166 15,913 3,572 9/30/2010 Gateway Village, CA — 5,917 27,298 — 989 5,917 28,287 34,204 6,624 12/16/2010 Division Crossing, OR — 3,706 8,327 — 5,700 3,706 14,027 17,733 3,980 12/22/2010 Halsey Crossing, OR (2) — — 7,773 — 7,690 — 15,463 15,463 2,914 12/22/2010 Marketplace Del Rio,CA — 13,420 22,251 9 2,462 13,429 24,713 38,142 6,357 1/3/2011 Pinole Vista Shopping Center, CA — 12,894 35,689 — 4,247 12,894 39,936 52,830 6,424 1/6/2011 / 8/27/2018 Desert Springs Marketplace, CA — 8,517 18,761 443 6,568 8,960 25,329 34,289 5,693 2/17/2011 Mills Shopping Center, CA — 4,084 16,833 — 11,693 4,084 28,526 32,610 8,137 2/17/2011 Morada Ranch, CA — 2,504 19,547 — 791 2,504 20,338 22,842 4,717 5/20/2011 Renaissance Towne Centre, CA — 8,640 13,848 — 1,667 8,640 15,515 24,155 2,987 8/3/2011 Country Club Gate Center, CA — 6,487 17,341 — 1,208 6,487 18,549 25,036 4,403 7/8/2011 Canyon Park Shopping Center, WA — 9,352 15,916 — 8,757 9,352 24,673 34,025 5,284 7/29/2011 Hawks Prairie Shopping Center, WA — 5,334 20,694 — 2,224 5,334 22,918 28,252 4,657 9/8/2011 The Kress Building, WA — 5,693 20,866 — 4,825 5,693 25,691 31,384 6,179 9/30/2011 Hillsboro Market Center, OR (2) — — 17,553 — 3,493 — 21,046 21,046 4,295 11/23/2011 Gateway Shopping Center, WA (2) — 6,242 23,462 — 8 6,242 23,470 29,712 4,582 2/16/2012 Euclid Plaza, CA — 7,407 7,753 — 2,905 7,407 10,658 18,065 2,954 3/28/2012 Green Valley Station, CA — 1,685 8,999 — 591 1,685 9,590 11,275 2,292 4/2/2012 Aurora Square, WA — 10,325 13,336 — 1,906 10,325 15,242 25,567 2,220 5/3/2012 / 5/22/2014 Marlin Cove Shopping Center, CA — 8,815 6,797 — 2,084 8,815 8,881 17,696 2,212 5/4/2012 Seabridge Marketplace, CA — 5,098 17,164 — 3,482 5,098 20,646 25,744 3,798 5/31/2012 The Village at Novato, CA — 5,329 4,412 — 1,550 5,329 5,962 11,291 1,044 7/24/2012 Glendora Shopping Center, CA — 5,847 8,758 — 211 5,847 8,969 14,816 2,062 8/1/2012 Wilsonville Old Town Square, OR — 4,181 15,394 — 509 4,181 15,903 20,084 3,122 8/1/2012 Bay Plaza, CA — 5,454 14,857 — 1,096 5,454 15,953 21,407 3,161 10/5/2012 Santa Teresa Village, CA — 14,965 17,162 — 5,539 14,965 22,701 37,666 4,819 11/8/2012 Cypress Center West, CA — 15,480 11,819 121 2,065 15,601 13,884 29,485 3,129 12/7/2012 Redondo Beach Plaza, CA — 16,242 13,625 55 217 16,297 13,842 30,139 2,659 12/28/2012 Harbor Place Center, CA — 16,506 10,527 — 289 16,506 10,816 27,322 1,932 12/28/2012 Diamond Bar Town Center, CA — 9,540 16,795 — 3,542 9,540 20,337 29,877 4,662 2/1/2013 Bernardo Heights Plaza, CA — 3,192 8,940 — 727 3,192 9,667 12,859 1,869 2/6/2013 Canyon Crossing, WA — 7,941 24,659 — 2,946 7,941 27,605 35,546 5,808 4/15/2013 Diamond Hills Plaza, CA 35,500 15,458 29,353 — 357 15,458 29,710 45,168 5,310 4/22/2013 Granada Shopping Center, CA — 3,673 13,459 — 491 3,673 13,950 17,623 2,536 6/27/2013 Hawthorne Crossings, CA — 10,383 29,277 — 127 10,383 29,404 39,787 4,805 6/27/2013 Robinwood Shopping Center, OR — 3,997 11,317 18 1,064 4,015 12,381 16,396 2,278 8/23/2013 5 Points Plaza, CA — 17,920 36,965 — 4,082 17,920 41,047 58,967 6,358 9/27/2013 Crossroads Shopping Center, WA — 68,366 67,756 — 17,984 68,366 85,740 154,106 14,039 9/27/2013 Peninsula Marketplace, CA — 14,730 19,214 — 1,958 14,730 21,172 35,902 3,572 11/1/2013 Country Club Village, CA — 9,986 26,579 — 2,017 9,986 28,596 38,582 5,188 11/26/2013 Plaza de la Canada, CA (2) — 10,351 24,819 — 519 10,351 25,338 35,689 3,777 12/13/2013 Tigard Marketplace, OR — 13,587 9,603 — 565 13,587 10,168 23,755 2,128 2/18/2014 Creekside Plaza, CA — 14,807 29,476 — 1,351 14,807 30,827 45,634 4,980 2/28/2014 North Park Plaza, CA — 13,593 17,733 — 832 13,593 18,565 32,158 2,473 4/30/2014 Fallbrook Shopping Center, CA (2) — 21,232 186,197 83 9,286 21,315 195,483 216,798 26,910 6/13/2014 Moorpark Town Center, CA — 7,063 19,694 — 1,562 7,063 21,256 28,319 3,569 12/4/2014 Mission Foothill Marketplace, CA — 11,415 17,783 — 107 11,415 17,890 29,305 1,334 12/4/2014 Wilsonville Town Center, OR — 10,334 27,101 — 622 10,334 27,723 38,057 3,666 12/11/2014 Park Oaks Shopping Center, CA — 8,527 38,064 — 629 8,527 38,693 47,220 4,803 1/6/2016 Ontario Plaza, CA — 9,825 26,635 — 1,499 9,825 28,134 37,959 3,707 1/6/2015 Winston Manor, CA — 10,018 9,762 — 1,854 10,018 11,616 21,634 1,626 1/7/2015 Jackson Square, CA — 6,886 24,558 — 921 6,886 25,479 32,365 2,796 7/1/2015 Tigard Promenade, OR — 9,844 10,843 — 101 9,844 10,944 20,788 1,173 7/28/2015 Sunnyside Village Square, OR — 4,428 13,324 — 3,412 4,428 16,736 21,164 1,996 7/28/2015 Gateway Centre, CA — 16,275 28,308 — 3,720 16,275 32,028 48,303 3,169 9/1/2015 Johnson Creek Center, OR — 9,009 22,534 — 1,243 9,009 23,777 32,786 2,510 11/9/2015 Iron Horse Plaza, CA — 8,187 39,654 — 1,571 8,187 41,225 49,412 3,400 12/4/2015 Bellevue Marketplace, WA — 10,488 39,119 — 8,385 10,488 47,504 57,992 3,972 12/10/2015 Four Corner Square, WA — 9,926 31,415 — 350 9,926 31,765 41,691 3,123 12/21/2015 Warner Plaza, CA — 16,104 60,188 — 8,834 16,104 69,022 85,126 6,067 12/31/2015 Magnolia Shopping Center, CA — 12,501 27,040 — 1,866 12,501 28,906 41,407 2,545 3/10/2016 Casitas Plaza Shopping Center, CA 7,158 10,734 22,040 — 961 10,734 23,001 33,735 1,825 3/10/2016 Bouquet Center, CA — 10,040 48,362 — 479 10,040 48,841 58,881 3,891 4/28/2016 North Ranch Shopping Center, CA — 31,522 95,916 — 1,061 31,522 96,977 128,499 6,884 6/1/2016 Monterey Center, CA (2) — 1,073 10,609 — (36 ) 1,073 10,573 11,646 753 7/14/2016 Rose City Center, OR (2) — 3,637 10,301 — (78 ) 3,637 10,223 13,860 690 9/15/2016 The Knolls, CA — 9,726 18,299 — 20 9,726 18,319 28,045 1,265 10/3/2016 Bridle Trails Shopping Center, WA — 11,534 20,700 — 3,633 11,534 24,333 35,867 1,551 10/17/2016 Torrey Hills Corporate Center, CA — 5,579 3,915 — 2,435 5,579 6,350 11,929 662 12/6/2016 PCC Community Markets Plaza, WA — 1,856 6,914 — 7 1,856 6,921 8,777 432 1/25/2017 The Terraces, CA — 18,378 37,103 — 505 18,378 37,608 55,986 2,046 3/17/2017 Santa Rosa Southside Shopping Center, CA — 5,595 24,453 — 1,477 5,595 25,930 31,525 1,308 3/24/2017 Division Center, OR — 6,917 26,098 — 1,421 6,917 27,519 34,436 1,433 4/5/2017 Highland Hill Shopping Center, WA — 10,511 37,825 23 397 10,534 38,222 48,756 2,018 5/9/2017 Monta Loma Plaza, CA — 18,226 11,113 — 57 18,226 11,170 29,396 426 9/19/2017 Fullerton Crossroads, CA 26,000 28,512 45,419 — 234 28,512 45,653 74,165 1,776 10/11/2017 Riverstone Marketplace, WA 18,050 5,113 27,594 — 117 5,113 27,711 32,824 1,046 10/11/2017 North Lynnwood Shopping Center, WA — 4,955 10,335 — 117 4,955 10,452 15,407 401 10/19/2017 The Village at Nellie Gail Ranch, CA — 22,730 22,578 — 953 22,730 23,531 46,261 764 11/30/2017 Stadium Center, WA — 1,699 17,229 — 79 1,699 17,308 19,007 391 2/23/2018 King City Plaza, OR — 5,161 10,072 — 49 5,161 10,121 15,282 215 5/18/2018 $ 86,708 $ 892,736 $ 2,059,275 $ 1,504 $ 206,957 $ 894,240 $ 2,266,232 $ 3,160,472 $ 329,207 (a) RECONCILIATION OF REAL ESTATE – OWNED SUBJECT TO OPERATING LEASES (in thousands) Year Ended December 31, 2018 2017 2016 Balance at beginning of period: $ 3,109,397 $ 2,687,018 $ 2,296,617 Property improvements during the year 40,300 54,481 41,359 Properties acquired during the year 43,387 374,004 354,035 Properties sold during the year (24,427 ) — — Assets written off during the year (8,185 ) (6,106 ) (4,993 ) Balance at end of period: $ 3,160,472 $ 3,109,397 $ 2,687,018 (b) RECONCILIATION OF ACCUMULATED DEPRECIATION (in thousands) Year Ended December 31, 2018 2017 2016 Balance at beginning of period: $ 260,115 $ 193,021 $ 134,311 Depreciation expenses 81,107 72,725 63,872 Properties sold during the year (3,551 ) — — Property assets fully depreciated and written off (8,464 ) (5,631 ) (5,162 ) Balance at end of period: $ 329,207 $ 260,115 $ 193,021 (1) Depreciation and investments in building and improvements reflected in the consolidated statement of operations is calculated over the estimated useful life of the assets as follows: Building: 39 - 40 years Property Improvements: 10 - 20 years (2) Property, or a portion thereof, is subject to a ground lease. (3) The aggregate cost for Federal Income Tax Purposes for real estate was approximately $2.9 billion at December 31, 2018 .

Organization, Basis of Presen_2

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
New Accounting Pronouncements	Recent Accounting Pronouncements In November 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2016-18, Restricted Cash. ASU No. 2016-18 requires companies to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Additionally, ASU No. 2016-18 requires a disclosure of a reconciliation between the statement of financial position and the statement of cash flows when the balance sheet includes more than one line item for cash, cash equivalents, restricted cash, and restricted cash equivalents. ASU No. 2016-18 is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. The Company adopted ASU No. 2016-18 effective January 1, 2018. The adoption of ASU No. 2016-18 impacted the presentation of cash flows with inclusion of restricted cash flows for each of the presented periods. In January 2017, the FASB issued ASU No. 2017-1, “Business Combinations: Clarifying the Definition of a Business.” The pronouncement changes the definition of a business to assist entities with evaluating when a set of transferred assets and activities is a business. The pronouncement requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities is not a business. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company adopted the provisions of ASU No. 2017-1 effective October 1, 2016. For the period from October 1, 2016 through December 31, 2018, for the Company’s acquisitions it was concluded substantially all of the fair value of the assets acquired with each property acquisition was concentrated in a single identifiable asset and did not meet the definition of a business under ASU No. 2017-1. Acquisition transaction costs associated with these property acquisitions were capitalized to real estate investments. In February 2016, the FASB issued ASU No. 2016-2, “Leases.” ASU No. 2016-2 is expected to result in the recognition of a right-to-use asset and related liability to account for future obligations under ground lease agreements for which the Company is the lessee. In addition, this ASU will require that lessees and lessors capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. Allocated payroll costs and other costs that are incurred regardless of whether the lease is obtained will no longer be capitalized as initial direct costs and instead will be expensed as incurred. As a lessor, under current accounting standards, the Company recognizes rental revenue from its operating leases on a straight-line basis over the respective lease terms. The Company commences recognition of rental revenue at the date the property is ready for its intended use and the tenant takes possession of or controls the physical use of the property. Under current accounting standards, tenant recoveries related to payments of real estate taxes, insurance, utilities, repairs and maintenance, common area expenses, and other operating expenses are considered lease components. The Company recognizes these tenant recoveries as revenue when services are rendered in an amount equal to the related operating expenses incurred that are recoverable under the terms of the applicable lease. Under ASU No. 2016-2, each lease agreement will be evaluated to identify the lease components and nonlease components at lease inception. The total consideration in the lease agreement will be allocated to the lease and nonlease components based on their relative standalone selling prices. Lessors will continue to recognize the lease revenue component using an approach that is substantially equivalent to existing guidance for operating leases (straight-line basis). In July 2018, the FASB issued an amendment to ASU No. 2016-2 that allows lessors to elect, as a practical expedient, not to allocate the total consideration to lease and nonlease 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 related lease component and, the combined single lease component would be classified as an operating lease. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company plans to adopt the provisions of ASU No. 2016-2 effective January 1, 2019 using the modified retrospective approach and expects to elect certain practical expedients permitted under the transition guidance. The Company currently estimates total assets and liabilities will increase approximately $18.0 million upon adoption. Further upon adoption, payroll-related costs that are incurred regardless of whether the lease is obtained will no longer be capitalized as initial direct costs and instead will be expensed as incurred. These costs amounted to approximately $1.3 million during the year ended December 31, 2018 . In May 2014, the FASB issued ASU No. 2014-9, “Revenue from Contracts with Customers.” The pronouncement was issued to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements for U.S. GAAP and International Financial Reporting Standards. The pronouncement is effective for reporting periods beginning after December 15, 2017. The Company adopted the provisions of ASU No. 2014-9 effective January 1, 2018 using the modified retrospective approach. The Company evaluated the revenue recognition for all contracts within this scope under existing accounting standards and under ASU No. 2014-9 and confirmed that there were no differences in the amounts recognized or the pattern of recognition. Therefore, the adoption of ASU No. 2014-9 did not result in an adjustment to the Company’s retained earnings on January 1, 2018.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements are prepared on the accrual basis in accordance with GAAP. In the opinion of management, the consolidated financial statements include all adjustments necessary, which are of a normal and recurring nature, for the fair presentation of the Company’s financial position and the results of operations and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company and those of its subsidiaries, which are wholly-owned or controlled by the Company. Entities which the Company does not control through its voting interest and entities which are variable interest entities (“VIEs”), but where it is not the primary beneficiary, are accounted for under the equity method. All significant intercompany balances and transactions have been eliminated. The Company follows the FASB guidance for determining whether an entity is a VIE and requires the performance of a qualitative rather than a quantitative analysis to determine the primary beneficiary of a VIE. Under this guidance, an entity would be required to consolidate a VIE if it has (i) the power to direct the activities that most significantly impact the entity’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Effective January 1, 2016, the Company adopted the provisions of ASU No. 2015-2, and as a result, concluded that the Operating Partnership is a VIE. The Company has concluded that because they have both the power and the rights to control the Operating Partnership, they are the primary beneficiary and are required to continue to consolidate the Operating Partnership. A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the consolidated balance sheet and modifies the presentation of net income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the disclosure of contingent assets and liabilities, the reported amounts of assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the periods covered by the financial statements. The most significant assumptions and estimates relate to the purchase price allocations, depreciable lives, revenue recognition and the collectability of tenant receivables, other receivables, notes receivables, the valuation of performance-based restricted stock, and derivatives. Actual results could differ from these estimates.
Federal Income Taxes	Federal Income Taxes The Company has elected to qualify as a REIT under Sections 856-860 of the Internal Revenue Code (the “Code”). Under those sections, a REIT that, among other things, distributes at least 90% of its REIT taxable income (determined without regard to the dividends paid deduction and excluding net capital gains) and meets certain other qualifications prescribed by the Code, will not be taxed on that portion of its taxable income that is distributed. Although it may qualify as a REIT for U.S. federal income tax purposes, the Company is subject to state income or franchise taxes in certain states in which some of its properties are located. In addition, taxable income from non-REIT activities managed through the Company’s taxable REIT subsidiary (“TRS”), if any, is fully subject to U.S. federal, state and local income taxes. For all periods from inception through September 26, 2013 the Operating Partnership had been an entity disregarded from its sole owner, ROIC, for U.S. federal income tax purposes and as such had not been subject to U.S. federal income taxes. Effective September 27, 2013, the Operating Partnership issued OP Units in connection with the acquisitions of two shopping centers. Accordingly, the Operating Partnership ceased being a disregarded entity and instead is being treated as a partnership for U.S. federal income tax purposes. The Company follows the FASB guidance that defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The FASB also provides guidance on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. The Company records interest and penalties relating to unrecognized tax benefits, if any, as interest expense. As of December 31, 2018 , the statute of limitations for tax years 2015 through and including 2017 remain open for examination by the Internal Revenue Service (“IRS”) and state taxing authorities. ROIC intends to make regular quarterly distributions to holders of its common stock. U.S. federal income tax law generally requires that a REIT distribute annually at least 90% of its REIT taxable income, without regard to the deduction for dividends paid and excluding net capital gains, and that it pay U.S. federal income tax at regular corporate rates to the extent that it annually distributes less than 100% of its net taxable income. ROIC intends to pay regular quarterly dividends to stockholders in an amount not less than its net taxable income, if and to the extent authorized by its board of directors. Before ROIC pays any dividend, whether for U.S. federal income tax purposes or otherwise, it must first meet both its operating requirements and its debt service on debt. If ROIC’s cash available for distribution is less than its net taxable income, it could be required to sell assets or borrow funds to make cash distributions or it may make a portion of the required distribution in the form of a taxable stock distribution or distribution of debt securities.
Real Estate Investments	Real Estate Investments All costs related to the improvement or replacement of real estate properties are capitalized. Additions, renovations and improvements that enhance and/or extend the useful life of a property are also capitalized. Expenditures for ordinary maintenance, repairs and improvements that do not materially prolong the normal useful life of an asset are charged to operations as incurred. During the years ended December 31, 2018 and 2017 , capitalized costs related to the improvements or replacement of real estate properties were approximately $40.3 million and $54.5 million , respectively. The Company expenses transaction costs associated with business combinations and unsuccessful property asset acquisitions in the period incurred and capitalizes transaction costs associated with successful property asset acquisitions. In conjunction with the Company’s pursuit and acquisition of real estate investments, the Company expensed acquisition transaction costs during the years ended December 31, 2017 and 2016 of approximately $4,000 and $824,000 , respectively. The Company did not expense any acquisition transaction costs during the year ended December 31, 2018 . The Company evaluates each acquisition of real estate to determine if the acquired property meets the definition of a business and needs to be accounted for as a business combination. Under ASU No. 2017-1, the Company first determines whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets. If this threshold is met, the acquired property does not meet the definition of a business and is accounted for as an asset acquisition. The Company expects that acquisitions of real estate properties will not meet the revised definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets (i.e., land, buildings, and related intangible assets). The Company recognizes the acquisition of real estate properties, including acquired tangible (consisting of land, buildings and improvements), and acquired intangible assets and liabilities (consisting of above-market and below-market leases and acquired in-place leases) at their fair value (for acquisitions meeting the definition of a business) and relative fair value (acquisitions not meeting the definition of a business). The relative fair values used to allocate the cost of an asset acquisition are determined using the same methodologies and assumptions the Company utilizes to determine fair value in a business combination. Acquired lease intangible assets include above-market leases and acquired in-place leases, and acquired lease intangible liabilities represent below-market leases, in the accompanying consolidated balance sheets. The fair value of the tangible assets of an acquired property is determined by valuing the property as if it were vacant, which value is then allocated to land, buildings and improvements based on management’s determination of the relative fair values of these assets. In valuing an acquired property’s intangibles, factors considered by management include an estimate of carrying costs during the expected lease-up periods, and estimates of lost rental revenue during the expected lease-up periods based on management’s evaluation of current market demand. Management also estimates costs to execute similar leases, including leasing commissions, tenant improvements, legal and other related costs. Leasing commissions, legal and other related costs (“lease origination costs”) are classified as deferred charges in the accompanying consolidated balance sheets. The value of in-place leases is measured by the excess of (i) the purchase price paid for a property after adjusting existing in-place leases to market rental rates, over (ii) the estimated fair value of the property as if vacant. Above-market and below-market lease values are recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between the contractual amounts to be received and management’s estimate of market lease rates, measured over the terms of the respective leases that management deemed appropriate at the time of acquisition. Such valuations include a consideration of the non-cancellable terms of the respective leases as well as any applicable renewal periods. The fair values associated with below-market rental renewal options are determined based on the Company’s experience and the relevant facts and circumstances that existed at the time of the acquisitions. The value of the above-market and below-market leases is amortized to rental income, over the terms of the respective leases including option periods, if applicable. The value of in-place leases are amortized to expense over the remaining non-cancellable terms of the respective leases. If a lease were to be terminated prior to its stated expiration, all unamortized amounts relating to that lease would be recognized in operations at that time.
Asset Impairment	Asset Impairment The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the asset to aggregate future net cash flows (undiscounted and without interest) expected to be generated by the asset. If such assets are considered impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceed the fair value.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed the federally insured limit by the Federal Deposit Insurance Corporation.
Restricted Cash	Restricted Cash The terms of the Company’s mortgage loans payable may require the Company to deposit certain replacement and other reserves with its lenders. Such “restricted cash” is generally available only for property-level requirements for which the reserves have been established and is not available to fund other property level or Company level obligations.
Revenue Recognition	Revenue Recognition Management has determined that all of the Company’s leases with its various tenants are operating leases. Rental income is generally recognized based on the terms of leases entered into with tenants. In those instances in which the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. When the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin. Minimum rental income from leases with scheduled rent increases is recognized on a straight-line basis over the lease term. Percentage rent is recognized when a specific tenant’s sales breakpoint is achieved. Property operating expense recoveries from tenants of common area maintenance, real estate taxes and other recoverable costs are recognized in the period the related expenses are incurred. Lease incentives are amortized as a reduction of rental revenue over the respective tenant lease terms. Termination fees (included in other income) are fees that the Company has agreed to accept in consideration for permitting certain tenants to terminate their lease prior to the contractual expiration date. The Company recognizes termination fees when the following conditions are met: (a) the termination agreement is executed; (b) the termination fee is determinable; (c) all landlord services pursuant to the terminated lease have been rendered; and (d) collectability of the termination fee is assured. Interest income is recognized as it is earned. Gains or losses on disposition of properties are recorded when the criteria for recognizing such gains or losses under GAAP have been met. The Company must make estimates as to the collectability of its accounts receivable related to base rent, straight-line rent, expense reimbursements and other revenues. Management analyzes accounts receivable by considering tenant creditworthiness, current economic trends, and changes in tenants’ payment patterns when evaluating the adequacy of the allowance for doubtful accounts receivable. The Company also provides an allowance for future credit losses of the deferred straight-line rents receivable.
Depreciation and Amortization	Depreciation and Amortization The Company uses the straight-line method for depreciation and amortization. Buildings are depreciated over the estimated useful lives which the Company estimates to be 39 - 40 years. Property improvements are depreciated over the estimated useful lives that range from 10 to 20 years. Furniture and fixtures are depreciated over the estimated useful lives that range from 3 to 10 years. Tenant improvements are amortized over the shorter of the life of the related leases or their useful life.
Deferred Charges	Deferred Leasing and Financing Costs Costs incurred in obtaining tenant leases (principally leasing commissions and acquired lease origination costs) are amortized ratably over the life of the tenant leases. Costs incurred in obtaining long-term financing are amortized ratably over the related debt agreement. The amortization of deferred leasing and financing costs is included in Depreciation and amortization and Interest expense and other finance expenses, respectively, in the Consolidated Statements of Operations.
Internal Capitalized Leasing Costs	Internal Capitalized Leasing Costs Through December 31, 2018, the Company capitalized a portion of payroll-related costs related to its leasing personnel associated with new leases and lease renewals. These costs are amortized over the life of the respective leases.
Concentration Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and tenant receivables. The Company places its cash and cash equivalents in excess of insured amounts with high quality financial institutions. The Company performs ongoing credit evaluations of its tenants and requires tenants to provide security deposits.
Earnings Per Share	Earnings Per Share Basic earnings per share (“EPS”) excludes the impact of dilutive shares and is computed by dividing net income by the weighted average number of shares of common stock outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue shares of common stock were exercised or converted into shares of common stock and then shared in the earnings of the Company. For the years ended December 31, 2018 , 2017 and 2016 , basic EPS was determined by dividing net income allocable to common stockholders for the applicable period by the weighted average number of shares of common stock outstanding during such period. Net income during the applicable period is also allocated to the time-based unvested restricted stock as these grants are entitled to receive dividends and are therefore considered a participating security. Time-based unvested restricted stock is not allocated net losses and/or any excess of dividends declared over net income; such amounts are allocated entirely to the common stockholders other than the holders of time-based unvested restricted stock. The performance-based restricted stock grants awarded under the 2009 Equity Incentive Plan described in Note 8 are excluded from the basic EPS calculation, as these units are not participating securities until they vest.
Share-based Compensation	Stock-Based Compensation The Company has a stock-based employee compensation plan, which is more fully described in Note 8. The Company accounts for its stock-based compensation plan based on the FASB guidance which requires that compensation expense be recognized based on the fair value of the stock awards less estimated forfeitures. Restricted stock grants vest based upon the completion of a service period (“time based grants”) and/or the Company meeting certain established market specific financial performance criteria (“performance based grants”). Time based grants are valued according to the market price for the Company’s common stock at the date of grant. For performance based grants, a Monte Carlo valuation model is used, taking into account the underlying contingency risks associated with the performance criteria. It is the Company’s policy to grant options with an exercise price equal to the quoted closing market price of stock on the grant date. Awards of stock options and time based grants of stock are expensed as compensation on a straight-line basis over the vesting period. Awards of performance-based grants are expensed as compensation under the accelerated attribution method and are recognized in income regardless of the results of the performance criteria.
Derivatives	Derivatives The Company records all derivatives on the balance sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged forecasted transactions in a cash flow hedge. When the Company terminates a derivative for which cash flow hedging was being applied, the balance which was recorded in Other Comprehensive Income is amortized to interest expense over the remaining contractual term of the derivative as long as the hedged forecasted transactions continue to be probable of occurring. The Company includes cash payments made to terminate interest rate derivatives as an operating activity on the statement of cash flows, given the nature of the underlying cash flows that the derivative was hedging.
Segment Reporting	Segment Reporting The Company’s primary business is the ownership, management, and redevelopment of retail real estate properties. The Company reviews operating and financial information for each property on an individual basis and therefore, each property represents an individual operating segment. The Company evaluates financial performance using property operating income, defined as operating revenues (base rent and recoveries from tenants), less property and related expenses (property operating expenses and property taxes). The Company has aggregated the properties into one reportable segment as the properties share similar long-term economic characteristics and have other similarities including the fact that they are operated using consistent business strategies, are typically located in major metropolitan areas, and have similar tenant mixes.

Organization, Basis of Presen_3

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) [Line Items]
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	The unamortized balances of deferred leasing costs included in deferred charges in the Consolidated Balance Sheets as of December 31, 2018 that will be charged to future operations are as follows (in thousands): Lease Origination Costs 2019 $ 7,041 2020 5,802 2021 4,867 2022 4,029 2023 3,098 Thereafter 9,020 $ 33,857
Schedule of Cash Flow, Supplemental Disclosures	The following tables provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands): Year Ended December 31, 2018 2017 2016 Supplemental disclosure of cash activities: Cash paid on gross receipts and income for federal and state purposes $ 291 $ 253 $ 206 Interest paid $ 60,494 $ 46,271 $ 34,275 Other non-cash investing and financing activities: Issuance of OP Units in connection with acquisitions $ — $ 49,599 $ 46,140 Fair value of assumed mortgages upon acquisition $ — $ 46,801 $ 17,618 Intangible lease liabilities $ 1,680 $ 48,684 $ 32,615 Interest rate swap asset $ 610 $ 3,446 $ 875 Interest rate swap liabilities $ 580 $ — $ — Accrued real estate improvement costs $ (1,367 ) $ 383 $ 601 Redemption / exchange of OP Units $ — $ 50,155 $ 15,990
ROIC
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) [Line Items]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the reconciliation between basic and diluted EPS for ROIC (in thousands, except share data): Year Ended December 31, 2018 2017 2016 Numerator: Net income $ 47,141 $ 42,688 $ 36,430 Less income attributable to non-controlling interests (4,405 ) (4,211 ) (3,676 ) Less earnings allocated to unvested shares (401 ) (319 ) (270 ) Net income available for common stockholders, basic $ 42,335 $ 38,158 $ 32,484 Numerator: Net income $ 47,141 $ 42,688 $ 36,430 Less earnings allocated to unvested shares (401 ) (319 ) (270 ) Net income available for common stockholders, diluted $ 46,740 $ 42,369 $ 36,160 Denominator: Denominator for basic EPS – weighted average common equivalent shares 112,645,490 109,400,123 104,072,222 OP units 11,626,312 12,060,835 11,747,509 Restricted stock awards – performance-based 183,683 153,807 86,996 Stock options 103,408 129,066 133,213 Denominator for diluted EPS – weighted average common equivalent shares 124,558,893 121,743,831 116,039,940
Retail Opportunity Investments Partnership L.P.
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) [Line Items]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the reconciliation between basic and diluted earnings per unit for the Operating Partnership (in thousands, except unit data): Year Ended December 31, 2018 2017 2016 Numerator: Net income $ 47,141 $ 42,688 $ 36,430 Less earnings allocated to unvested shares (401 ) (319 ) (270 ) Net income available to unitholders, basic and diluted $ 46,740 $ 42,369 $ 36,160 Denominator: Denominator for basic earnings per unit – weighted average common equivalent units 124,271,802 121,460,958 115,819,731 Restricted stock awards – performance-based 183,683 153,807 86,996 Stock options 103,408 129,066 133,213 Denominator for diluted earnings per unit – weighted average common equivalent units 124,558,893 121,743,831 116,039,940

Real Estate Investments (Tables

Real Estate Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of purchase price allocation	The financial information set forth below summarizes the Company’s purchase price allocation for the properties acquired during the years ended December 31, 2018 and 2017 (in thousands). December 31, 2018 December 31, 2017 Assets Land $ 7,666 $ 123,203 Building and improvements 35,629 251,277 Acquired lease intangible asset 1,763 24,766 Deferred charges 818 9,196 Assets acquired $ 45,876 $ 408,442 Liabilities Mortgage notes assumed $ — $ 46,801 Acquired lease intangible liability 1,680 48,684 Liabilities assumed $ 1,680 $ 95,485
Condensed Income Statement	The following table summarizes the operating results included in the Company’s historical consolidated statement of operations for the year ended December 31, 2018 for the properties acquired during the year ended December 31, 2018 (in thousands). Year Ended December 31, 2018 Statement of operations: Revenues $ 2,343 Net income attributable to Retail Opportunity Investments Corp. $ 753 The following table summarizes the operating results included in the Company’s historical consolidated statement of operations for the year ended December 31, 2017 for the properties acquired during the year ended December 31, 2017 (in thousands). Year Ended December 31, 2017 Statement of operations: Revenues $ 13,500 Net income attributable to Retail Opportunity Investments Corp. $ 2,948

Acquired Lease Intangibles (Tab

Acquired Lease Intangibles (Tables)	12 Months Ended
	Dec. 31, 2018
Acquired Lease Intangibles (Tables) [Line Items]
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	Intangible assets and liabilities as of December 31, 2018 and 2017 consisted of the following (in thousands): December 31, 2018 December 31, 2017 Assets: In-place leases $ 92,354 $ 99,924 Accumulated amortization (36,835 ) (36,971 ) Above-market leases 30,093 33,176 Accumulated amortization (13,503 ) (13,351 ) Acquired lease intangible assets, net $ 72,109 $ 82,778 Liabilities: Below-market leases $ 217,212 $ 222,929 Accumulated amortization (51,066 ) (43,945 ) Acquired lease intangible liabilities, net $ 166,146 $ 178,984
Acquired Lease Intangible Assets
Acquired Lease Intangibles (Tables) [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The scheduled future amortization of acquired lease intangible assets as of December 31, 2018 is as follows (in thousands): Year Ending December 31: 2019 $ 10,573 2020 8,566 2021 6,898 2022 5,705 2023 5,092 Thereafter 35,275 Total future amortization of acquired lease intangible assets $ 72,109
Acquired Lease Intangible Liabilities
Acquired Lease Intangibles (Tables) [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The scheduled future amortization of acquired lease intangible liabilities as of December 31, 2018 is as follows (in thousands): Year Ending December 31: 2019 $ 14,675 2020 13,347 2021 12,075 2022 11,005 2023 9,999 Thereafter 105,045 Total future amortization of acquired lease intangible liabilities $ 166,146

Tenant Leases (Tables)

Tenant Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Schedule of Future Minimum Base Rentals on NonCancellable Operating Leases	Future minimum rents to be received under non-cancellable leases as of December 31, 2018 are summarized as follows (in thousands): Year Ending December 31: 2019 $ 198,998 2020 181,234 2021 160,082 2022 134,368 2023 105,657 Thereafter 429,172 Total minimum lease payments $ 1,209,511

Mortgage Notes Payable, Credi_2

Mortgage Notes Payable, Credit Facilities and Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Debt	The mortgage notes payable collateralized by respective properties and assignment of leases at December 31, 2018 and December 31, 2017 , respectively, were as follows (in thousands, except interest rates): Property Maturity Date Interest Rate December 31, 2018 December 31, 2017 Santa Teresa Village February 2018 6.200 % $ — $ 10,138 Magnolia Shopping Center October 2018 5.500 % — 8,951 Casitas Plaza Shopping Center June 2022 5.320 % 7,158 7,307 Riverstone Marketplace July 2022 4.960 % 18,050 18,424 Fullerton Crossroads April 2024 4.728 % 26,000 26,000 Diamond Hills Plaza October 2025 3.550 % 35,500 35,500 $ 86,708 $ 106,320 Mortgage premiums 2,074 1,921 Net unamortized deferred financing costs (271 ) (326 ) Total mortgage notes payable $ 88,511 $ 107,915
Schedule of Maturities of Long-term Debt	The combined aggregate principal maturities of the Company’s unsecured senior notes payable during the next five years and thereafter are as follows (in thousands): Principal Repayments 2019 $ — 2020 — 2021 — 2022 — 2023 250,000 Thereafter 700,000 Total $ 950,000 The combined aggregate principal maturities of mortgage notes payable during the next five years and thereafter are as follows (in thousands): Principal Repayments Scheduled Amortization Mortgage Premium Total 2019 $ — $ 551 $ 481 $ 1,032 2020 — 577 481 1,058 2021 — 717 481 1,198 2022 23,129 1,003 344 24,476 2023 — 686 216 902 Thereafter 58,787 1,258 71 60,116 Total $ 81,916 $ 4,792 $ 2,074 $ 88,782
Schedule of Long-term Debt Instruments	The carrying value of the Company’s unsecured Senior Notes Due 2023 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 250,000 $ 250,000 Unamortized debt discount (2,339 ) (2,737 ) Net unamortized deferred financing costs (1,304 ) (1,567 ) Senior Notes Due 2023 $ 246,357 $ 245,696 The carrying values of the Company’s unsecured term loan (the “term loan”) were as follows (in thousands): December 31, 2018 December 31, 2017 Term loan $ 300,000 $ 300,000 Net unamortized deferred financing costs (924 ) (1,184 ) Term loan $ 299,076 $ 298,816 The carrying values of the Company’s unsecured revolving credit facility were as follows (in thousands): December 31, 2018 December 31, 2017 Credit facility $ 156,000 $ 143,500 Net unamortized deferred financing costs (2,311 ) (3,171 ) Credit facility $ 153,689 $ 140,329 The carrying value of the Company’s unsecured Senior Notes Due 2024 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 250,000 $ 250,000 Unamortized debt discount (2,252 ) (2,578 ) Net unamortized deferred financing costs (1,314 ) (1,535 ) Senior Notes Due 2024 $ 246,434 $ 245,887 The carrying value of the Company’s unsecured Senior Notes Due 2026 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 200,000 $ 200,000 Net unamortized deferred financing costs (219 ) (248 ) Senior Notes Due 2026 $ 199,781 $ 199,752 The carrying value of the Company’s unsecured Senior Notes Due 2027 is as follows (in thousands): December 31, 2018 December 31, 2017 Principal amount $ 250,000 $ 250,000 Net unamortized deferred financing costs (1,123 ) (1,249 ) Senior Notes Due 2027 $ 248,877 $ 248,751
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	The unamortized balances of deferred financing costs associated with the Company’s term loan, unsecured revolving credit facility, Senior Notes Due 2027, Senior Notes Due 2026, Senior Notes Due 2024, Senior Notes Due 2023, and mortgage notes payable included as a direct reduction from the carrying amount of the related debt instrument in the Consolidated Balance Sheets as of December 31, 2018 that will be charged to future operations during the next five years and thereafter are as follows (in thousands): Financing Costs 2019 $ 1,791 2020 1,791 2021 1,522 2022 848 2023 663 Thereafter 851 $ 7,466

Stock Compensation and Other _2

Stock Compensation and Other Benefit Plans for ROIC (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	Shares Weighted Average Non-vested as of December 31, 2017 781,467 $ 18.14 Granted 514,972 $ 15.85 Vested (274,608 ) $ 18.46 Forfeited (18,996 ) $ 17.75 Non-vested as of December 31, 2018 1,002,835 $ 16.88

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	The following is a summary of the terms of the Company’s current interest rate swaps as of December 31, 2018 (in thousands): Swap Counterparty Notional Amount Effective Date Maturity Date Interest Rate Swap Agreements: Bank of Montreal $ 50,000 1/29/2016 1/31/2019 Regions Bank $ 50,000 2/29/2016 1/31/2019 Bank of Montreal $ 100,000 12/29/2017 8/31/2022 U.S. Bank $ 100,000 12/29/2017 8/31/2022 Forward Starting Interest Rate Swap Agreements: Regions Bank $ 50,000 1/31/2019 8/31/2022 Royal Bank of Canada $ 50,000 1/31/2019 8/31/2022
Schedule of Derivative Liabilities at Fair Value	The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands). Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total December 31, 2018: Assets Derivative financial instruments $ — $ 4,931 $ — $ 4,931 Liabilities Derivative financial instruments $ — $ (580 ) $ — $ (580 ) December 31, 2017 Assets Derivative financial instruments $ — $ 4,321 $ — $ 4,321
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 balance sheet as of December 31, 2018 and 2017 , respectively (in thousands): Derivatives designed as hedging instruments Balance sheet location December 31, 2018 Fair Value December 31, 2017 Fair Value Interest rate products Other assets $ 4,931 $ 4,321 Interest rate products Other liabilities $ (580 ) $ —
Derivative Instruments, Gain (Loss)	The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the years ended December 31, 2018 , 2017 , and 2016 , respectively (in thousands). Amounts reclassified from other comprehensive income (“OCI”) due to ineffectiveness are recognized as interest expense. Year Ended December 31, 2018 2017 2016 Amount of gain recognized in OCI on derivatives $ 1,648 $ 3,665 $ 541 Amount of loss reclassified from AOCI into interest $ 57 $ 1,920 $ 2,473

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	The following table represents the Company’s future minimum annual lease payments under operating leases as of December 31, 2018 (in thousands): Operating Leases 2019 $ 1,280 2020 1,287 2021 1,283 2022 1,304 2023 1,330 Thereafter 33,939 Total minimum lease payments $ 40,423

Quarterly Results of Operatio_2

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Results of Operations (Unaudited) (Tables) [Line Items]
Schedule of Quarterly Financial Information	The unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 for ROIC are as follows (in thousands, except share data): Year Ended December 31, 2018 March 31 June 30 September 30 December 31 Total revenues $ 74,395 $ 72,341 $ 73,904 $ 75,158 Net income $ 11,824 $ 8,102 $ 15,647 $ 11,568 Net income attributable to ROIC $ 10,702 $ 7,339 $ 14,194 $ 10,501 Basic and diluted income per share $ 0.09 $ 0.06 $ 0.12 $ 0.09 Year Ended December 31, 2017 March 31 June 30 September 30 December 31 Total revenues $ 65,900 $ 66,640 $ 67,966 $ 72,754 Net income $ 11,251 $ 9,197 $ 10,127 $ 12,113 Net income attributable to ROIC $ 10,170 $ 8,309 $ 9,149 $ 10,849 Basic and diluted income per share $ 0.09 $ 0.08 $ 0.08 $ 0.10
Retail Opportunity Investments Partnership L.P.
Quarterly Results of Operations (Unaudited) (Tables) [Line Items]
Schedule of Quarterly Financial Information	The unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 for the Operating Partnership are as follows (in thousands, except unit data): Year Ended December 31, 2018 March 31 June 30 September 30 December 31 Total revenues $ 74,395 $ 72,341 $ 73,904 $ 75,158 Net income attributable to the Operating Partnership $ 11,824 $ 8,102 $ 15,647 $ 11,568 Basic and diluted income per unit $ 0.09 $ 0.06 $ 0.12 $ 0.09 Year Ended December 31, 2017 March 31 June 30 September 30 December 31 Total revenues $ 65,900 $ 66,640 $ 67,966 $ 72,754 Net income attributable to the Operating Partnership $ 11,251 $ 9,197 $ 10,127 $ 12,113 Basic and diluted income per unit $ 0.09 $ 0.08 $ 0.08 $ 0.10

Organization, Basis of Presen_4

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2019USD ($)
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Taxable income minimum distribution portion not subject to federal taxation (in percentage)	90.00%
Real estate improvements	$ 40,300	$ 54,500
Acquisition transaction costs	0	4	$ 824
Allowance for doubtful accounts receivable	6,900	6,400
Payroll related costs capitalized	$ 1,300	$ 1,200	$ 1,200
Number of segments | segment	1
Minimum | Building
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)	39 years
Minimum | Building Improvements
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)	10 years
Minimum | Furniture and Fixtures
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)	3 years
Maximum | Building
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)	40 years
Maximum | Building Improvements
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)	20 years
Maximum | Furniture and Fixtures
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)	10 years
Accounting Standards Update 2016-02 | Scenario, Forecast
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Operating lease, liability				$ 18,000
Operating lease, right-of-use asset				$ 18,000

Organization, Basis of Presen_5

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges [Line Items]
Deferred charges, net	$ 33,857	$ 37,167
Lease Origination Costs
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges [Line Items]
2,019	7,041
2,020	5,802
2,021	4,867
2,022	4,029
2,023	3,098
Thereafter	9,020
Deferred charges, net	$ 33,857

Organization, Basis of Presen_6

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS - 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
Numerator:
Net income	$ 11,568	$ 15,647	$ 8,102	$ 11,824	$ 12,113	$ 10,127	$ 9,197	$ 11,251	$ 47,141	$ 42,688	$ 36,430
Less income attributable to non-controlling interests									(4,405)	(4,211)	(3,676)
Less earnings allocated to unvested shares, basic									(401)	(319)	(270)
Net income available to common stockholders, basic									42,335	38,158	32,484
Less earnings allocated to unvested shares, diluted									(401)	(319)	(270)
Net income available to common stockholders, diluted									$ 46,740	$ 42,369	$ 36,160
Denominator:
Denominator for basic EPS – weighted average common equivalent shares (in shares)									112,645,490	109,400,123	104,072,222
Denominator for diluted EPS – weighted average common equivalent shares (in shares)									124,558,893	121,743,831	116,039,940
Retail Opportunity Investments Partnership L.P.
Numerator:
Net income	$ 11,568	$ 15,647	$ 8,102	$ 11,824	$ 12,113	$ 10,127	$ 9,197	$ 11,251	$ 47,141	$ 42,688	$ 36,430
Less earnings allocated to unvested shares, basic									(401)	(319)	(270)
Net income available to unitholders, basic and diluted									$ 46,740	$ 42,369	$ 36,160
Denominator:
Denominator for basic EPS – weighted average common equivalent shares (in shares)									124,271,802	121,460,958	115,819,731
Denominator for diluted EPS – weighted average common equivalent shares (in shares)									124,558,893	121,743,831	116,039,940
OP Units
Denominator:
OP Units (in shares)									11,626,312	12,060,835	11,747,509
Restricted stock awards – performance-based
Denominator:
Restricted stock awards - performance based and stock options (in shares)									183,683	153,807	86,996
Restricted stock awards – performance-based | Retail Opportunity Investments Partnership L.P.
Denominator:
Restricted stock awards - performance based and stock options (in shares)									183,683	153,807	86,996
Stock options
Denominator:
Restricted stock awards - performance based and stock options (in shares)									103,408	129,066	133,213
Stock options | Retail Opportunity Investments Partnership L.P.
Denominator:
Restricted stock awards - performance based and stock options (in shares)									103,408	129,066	133,213

Organization, Basis of Presen_7

Organization, Basis of Presentation and Summary of Significant Accounting Policies (Supplemental Cash Flow Disclosure) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other non-cash investing and financing activities [Abstract]
Cash paid on gross receipts and income for federal and state purposes	$ 291	$ 253	$ 206
Interest paid	60,494	46,271	34,275
Issuance of OP Units in connection with acquisitions	0	49,599	46,140
Fair value of assumed mortgages upon acquisition	0	46,801	17,618
Intangible lease liabilities	1,680	48,684	32,615
Interest rate swap asset	610	3,446	875
Interest rate swap liabilities	580	0	0
Accrued real estate improvement costs	(1,367)	383	601
Redemption / exchange of OP Units	$ 0	$ 50,155	$ 15,990

Real Estate Investments (Acquis

Real Estate Investments (Acquisitions) (Details) ft² in Thousands, $ in Thousands	May 18, 2018USD ($)ft²	Feb. 23, 2018USD ($)ft²	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)ft²property	Dec. 31, 2016USD ($)	Sep. 27, 2018USD ($)
Note 2 - Real Estate Investments (Details) [Line Items]
Document Period End Date			Dec. 31, 2018
Number of properties acquired | property				10
Proceeds from sale of real estate			$ 26,880	$ 0	$ 0
Gain on sale of real estate			5,890	0	$ 0
West Coast
Note 2 - Real Estate Investments (Details) [Line Items]
Adjusted purchase price				$ 313,000
Area of real estate property (in Square Feet) | ft²				1,100
Stadium Center | Tacoma, Washington
Note 2 - Real Estate Investments (Details) [Line Items]
Adjusted purchase price		$ 19,300
Area of real estate property (in Square Feet) | ft²		49
King City Plaza | King City, Oregon
Note 2 - Real Estate Investments (Details) [Line Items]
Adjusted purchase price	$ 15,700
Area of real estate property (in Square Feet) | ft²	63
Round Hill Square | Zephyr Cove, Nevada
Note 2 - Real Estate Investments (Details) [Line Items]
Sales Price of Property Sold						$ 28,000
Proceeds from sale of real estate			26,900
Gain on sale of real estate			$ 5,900

Real Estate Investments (Detail

Real Estate Investments (Details) - Purchase Price Allocation of Properties Acquired - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Document Period End Date	Dec. 31, 2018
Assets
Land	$ 7,666	$ 123,203
Building and improvements	35,629	251,277
Acquired lease intangible asset	1,763	24,766
Deferred charges	818	9,196
Assets acquired	45,876	408,442
Liabilities
Mortgage notes assumed	0	46,801
Acquired lease intangible liability	1,680	48,684
Liabilities assumed	$ 1,680	$ 95,485

Real Estate Investments (Deta_2

Real Estate Investments (Details) - Operating Results Included in the Company's Historical Consolidated Statement of Operations for Properties Acquired During the Reported Periods - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Revenues	$ 2,343	$ 13,500
Net income attributable to Retail Opportunity Investments Corp.	$ 753	$ 2,948

Acquired Lease Intangibles (Nar

Acquired Lease Intangibles (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of above and below Market Leases	$ 13,965	$ 17,078	$ 13,847
Amortization of acquired in place leases	$ 11,400	$ 14,400	$ 15,600

Acquired Lease Intangibles (Det

Acquired Lease Intangibles (Details) - Intangible Assets and Liabilities - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Acquired lease intangible assets	$ 72,109	$ 82,778
Acquired lease intangible assets, net	72,109	82,778
Liabilities:
Below-market leases	217,212	222,929
Accumulated amortization	(51,066)	(43,945)
Acquired lease intangible liabilities, net	166,146	178,984
In-place leases
Assets:
Acquired lease intangible assets	92,354	99,924
Accumulated amortization	(36,835)	(36,971)
Above-market leases
Assets:
Acquired lease intangible assets	30,093	33,176
Accumulated amortization	$ (13,503)	$ (13,351)

Acquired Lease Intangibles (D_2

Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 72,109	$ 82,778
Acquired Lease Intangible Assets
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets [Line Items]
2,019	10,573
2,020	8,566
2,021	6,898
2,022	5,705
2,023	5,092
Thereafter	35,275
Acquired lease intangible assets, net	$ 72,109

Acquired Lease Intangibles (D_3

Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities [Line Items]
Acquired lease intangible liabilities, net	$ 166,146	$ 178,984
Acquired Lease Intangible Liabilities
Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities [Line Items]
2,019	14,675
2,020	13,347
2,021	12,075
2,022	11,005
2,023	9,999
Thereafter	105,045
Acquired lease intangible liabilities, net	$ 166,146

Tenant Leases (Details) - Minim

Tenant Leases (Details) - Minimum Future Rentals to be Received under Non-cancellable Leases $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2,019	$ 198,998
2,020	181,234
2,021	160,082
2,022	134,368
2,023	105,657
Thereafter	429,172
Total minimum lease payments	$ 1,209,511

Mortgage Notes Payable, Credi_3

Mortgage Notes Payable, Credit Facilities and Senior Notes (Narrative) (Details) - USD ($)

Sep. 28, 2018

Feb. 01, 2018

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Nov. 10, 2017

Sep. 08, 2017

Jun. 30, 2017

Jul. 26, 2016

Sep. 29, 2015

Dec. 03, 2014

Dec. 09, 2013

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Principal repayments on mortgages

$ 19,612,000

$ 8,848,000

$ 7,816,000

Revolving Credit Facility

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Line of credit facility, maximum borrowing capacity

$ 600,000,000

$ 500,000,000

Line of credit facility, commitment fee (in percentage)

0.20%

Line of credit, fronting fee (in percentage)

0.125%

Credit facility

$ 156,000,000

143,500,000

Line of credit facility, interest rate during period (in percentage)

3.00%

Remaining borrowing capacity

$ 444,000,000

Revolving Credit Facility | Accordion Feature

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Line of credit facility, maximum borrowing capacity

$ 1,200,000,000

Federal Funds Effective Swap Rate | Revolving Credit Facility

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Basis Spread on variable rate (in percentage)

0.50%

Eurodollar | Revolving Credit Facility

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Basis Spread on variable rate (in percentage)

1.00%

Senior Notes

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Debt, face amount

$ 950,000,000

Term Loan Agreement

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Debt, face amount

$ 300,000,000

300,000,000

$ 300,000,000

Additional borrowing capacity

$ 200,000,000

Interest rate during period (in percentage)

3.10%

Term Loan Agreement | Federal Funds Effective Swap Rate

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Basis Spread on variable rate (in percentage)

0.50%

Term Loan Agreement | Eurodollar

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Basis Spread on variable rate (in percentage)

1.10%

Senior Notes Due 2027 | Senior Notes

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Debt, face amount

$ 250,000,000

250,000,000

$ 250,000,000

Interest Rate (in percentage)

4.19%

Senior Notes Due 2026 | Senior Notes

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Debt, face amount

200,000,000

200,000,000

$ 200,000,000

Interest Rate (in percentage)

3.95%

Senior Notes Due 2024 | Senior Notes

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Debt, face amount

250,000,000

250,000,000

$ 250,000,000

Interest Rate (in percentage)

4.00%

Senior Notes Due 2023 | Senior Notes

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Debt, face amount

$ 250,000,000

$ 250,000,000

$ 250,000,000

Interest Rate (in percentage)

5.00%

Santa Teresa Village

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Principal repayments on mortgages

$ 10,100,000

Magnolia Shopping Center

Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]

Principal repayments on mortgages

$ 8,800,000

Mortgage Notes Payable, Credi_4

Mortgage Notes Payable, Credit Facilities and Senior Notes - Mortgage Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Total mortgage notes payable	$ 88,511	$ 107,915
Notes Payable, Other Payables [Member]
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Long-term debt	86,708	106,320
Mortgage premiums	2,074	1,921
Net unamortized deferred financing costs	(271)	(326)
Total mortgage notes payable	$ 88,511	107,915
Notes Payable, Other Payables [Member] | Santa Teresa Village
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	6.20%
Long-term debt	$ 0	10,138
Notes Payable, Other Payables [Member] | Magnolia Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.50%
Long-term debt	$ 0	8,951
Notes Payable, Other Payables [Member] | Casitas Plaza Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.32%
Long-term debt	$ 7,158	7,307
Notes Payable, Other Payables [Member] | Riverstone Marketplace
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.96%
Long-term debt	$ 18,050	18,424
Notes Payable, Other Payables [Member] | Fullerton Crossroads
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.728%
Long-term debt	$ 26,000	26,000
Notes Payable, Other Payables [Member] | Diamond Hills Plaza
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	3.55%
Long-term debt	$ 35,500	$ 35,500

Mortgage Notes Payable, Credi_5

Mortgage Notes Payable, Credit Facilities and Senior Notes - Combined Aggregate Principal Maturities of Mortgage Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Total
Total mortgage notes payable	$ 88,511	$ 107,915
Mortgage Notes Payable
Principal Repayments
2,019	0
2,020	0
2,021	0
2,022	23,129
2,023	0
Thereafter	58,787
Long-term Debt	81,916
Scheduled Amortization
2,019	551
2,020	577
2,021	717
2,022	1,003
2,023	686
Thereafter	1,258
Total	4,792
Mortgage Premium
2,019	481
2,020	481
2,021	481
2,022	344
2,023	216
Thereafter	71
Total	2,074
Total
2,019	1,032
2,020	1,058
2,021	1,198
2,022	24,476
2,023	902
Thereafter	60,116
Total mortgage notes payable	$ 88,782

Mortgage Notes Payable, Credi_6

Mortgage Notes Payable, Credit Facilities and Senior Notes - Carrying Value of the Company’s Unsecured Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Nov. 10, 2017	Jul. 26, 2016	Sep. 29, 2015	Dec. 03, 2014	Dec. 09, 2013
Debt Instrument [Line Items]
Document Period End Date	Dec. 31, 2018
Credit facility	$ 153,689,000	$ 140,329,000
Senior Notes	941,449,000	940,086,000
Term Loan Agreement
Debt Instrument [Line Items]
Principal amount	300,000,000	300,000,000			$ 300,000,000
Net unamortized deferred financing costs	(924,000)	(1,184,000)
Long-term Debt	299,076,000	298,816,000
Senior Notes
Debt Instrument [Line Items]
Principal amount	950,000,000
Senior Notes | Senior Notes Due 2027
Debt Instrument [Line Items]
Principal amount	250,000,000	250,000,000	$ 250,000,000
Net unamortized deferred financing costs	(1,123,000)	(1,249,000)
Senior Notes	248,877,000	248,751,000
Senior Notes | Senior Notes Due 2026
Debt Instrument [Line Items]
Principal amount	200,000,000	200,000,000		$ 200,000,000
Net unamortized deferred financing costs	(219,000)	(248,000)
Senior Notes	199,781,000	199,752,000
Senior Notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount	250,000,000	250,000,000				$ 250,000,000
Unamortized debt discount	(2,252,000)	(2,578,000)
Net unamortized deferred financing costs	(1,314,000)	(1,535,000)
Senior Notes	246,434,000	245,887,000
Senior Notes | Senior Notes Due 2023
Debt Instrument [Line Items]
Principal amount	250,000,000	250,000,000					$ 250,000,000
Unamortized debt discount	(2,339,000)	(2,737,000)
Net unamortized deferred financing costs	(1,304,000)	(1,567,000)
Senior Notes	246,357,000	245,696,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility	156,000,000	143,500,000
Net unamortized deferred financing costs	(2,311,000)	(3,171,000)
Credit facility	$ 153,689,000	$ 140,329,000

Mortgage Notes Payable, Credi_7

Mortgage Notes Payable, Credit Facilities and Senior Notes Mortgage Notes Payable, Credit Facility and Senior Notes - Principal Repayments of Unsecured Senior Notes (Details) - Senior Notes	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
2,019	$ 0
2,020	0
2,021	0
2,022	0
2,023	250,000,000
Thereafter	700,000,000
Principal amount	$ 950,000,000

Mortgage Notes Payable, Credi_8

Mortgage Notes Payable, Credit Facilities and Senior Notes - Amortization of Financing Costs (Details) - Total Debt [Member] $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
2,019	$ 1,791
2,020	1,791
2,021	1,522
2,022	848
2,023	663
Thereafter	851
Deferred charges, net	$ 7,466

Preferred Stock of ROIC (Detail

Preferred Stock of ROIC (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares outstanding (in shares)	0	0

Common Stock of ROIC (Narrative

Common Stock of ROIC (Narrative) (Details)	May 01, 2018USD ($)agreement$ / shares	Dec. 12, 2017$ / sharesshares	Jul. 12, 2016USD ($)shares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)	Oct. 11, 2017shares	Jul. 31, 2013USD ($)
Common Stock and Warrants of ROIC (Details) [Line Items]
Common stock issued (in shares) | shares			6,555,000
Proceeds from the issuance of common stock			$ 133,000,000	$ 25,703,000	$ 4,481,000	$ 184,881,000
Common stock, par value (in usd per share) | $ / shares				$ 0.0001	$ 0.0001
Stock issuance costs				$ 570,000	$ 1,225,000	$ 7,097,000
Stock repurchase program, authorized amount								$ 50,000,000
Sales Agreement
Common Stock and Warrants of ROIC (Details) [Line Items]
Common stock issued (in shares) | shares				1,251,376
Proceeds from the issuance of common stock				$ 24,200,000
Number of sales agreements | agreement	5
Common stock, par value (in usd per share) | $ / shares	$ 0.0001
Common shares that may be sold under a sales agreement aggregate offering price, maximum	$ 250,000,000
Stock issuance costs				$ 242,000
Prior Sales Agreements [Member]
Common Stock and Warrants of ROIC (Details) [Line Items]
Common stock issued (in shares) | shares				75,314	34,001
Proceeds from the issuance of common stock				$ 1,500,000	$ 681,000
Stock issuance costs				$ 19,000	9,000
Fullerton Crossroads and Riverstone Marketplace
Common Stock and Warrants of ROIC (Details) [Line Items]
LP capital account, units issued (in shares) | shares							2,405,430
Common stock issued (in shares) | shares		2,584,254
Share price (usd per share) | $ / shares		$ 21.25
Restricted cash					$ 3,800,000

Stock Compensation and Other _3

Stock Compensation and Other Benefit Plans for ROIC (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2009shares	Apr. 25, 2018shares
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Compensation expense | $	$ 7,400	$ 6,200	$ 4,900
Employer discretionary contribution amount | $	$ 86	70	76
2009 Equity Incentive Plan [Member]
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Percentage of outstanding stock maximum (in percentage)				7.50%
Maximum number of shares (in shares) | shares				4,000,000
Equity Incentive Plan [Member]
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares					22,500,000
Fungible Unit to full value award conversion ratio					6.25
Restricted Stock
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Grants in period (in shares) | shares	514,972
Restricted Stock | 2009 Equity Incentive Plan [Member]
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Compensation cost not yet recognized | $	$ 7,500
Compensation cost not yet recognized, period for recognition (in years)	1 year 255 days
Vested in period, fair value | $	$ 5,500	$ 6,300	$ 5,600
Restricted stock awards – performance-based | Vesting on January 1, 2021
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Grants in period (in shares) | shares	180,200

Stock Compensation and Other _4

Stock Compensation and Other Benefit Plans for ROIC (Details) - Status of Non-vested Restricted Stock Awards - Restricted Stock	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Shares
Beginning balance ( in shares) | shares	781,467
Granted (in shares) | shares	514,972
Vested (in shares) | shares	(274,608)
Forfeited (in shares) | shares	(18,996)
Ending balance (in shares) | shares	1,002,835
Weighted Average Grant Date Fair Value
Beginning balance (in usd per share) | $ / shares	$ 18.14
Granted (in usd per share) | $ / shares	15.85
Vested (in usd per share) | $ / shares	18.46
Forfeited (in usd per share) | $ / shares	17.75
Ending balance (in usd per share) | $ / shares	$ 16.88

Capital of the Operating Part_2

Capital of the Operating Partnership (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Capital of the Operating Partnership [Line Items]
Ownership interest (in percentage)		90.80%
Total units outstanding ( in shares)		125,469,878
Shares outstanding (in shares)		113,992,837	112,347,451
Cash redemption of OP Units (in shares)		201,950
Equity redemption of OP Units, cash (in shares)		201,950
Equity Redemption of OP Units Cash Dollars		$ 3.7
OP Units
Capital of the Operating Partnership [Line Items]
Non-controlling interest redemption value		$ 187.9
Non-controlling interest redemption value (in usd per share)		$ 16.37
Common Stock
Capital of the Operating Partnership [Line Items]
Shares outstanding (in shares)		113,992,837	112,347,451	109,301,762		99,531,034
Limited Partner’s Capital | Retail Opportunity Investments Partnership L.P.
Capital of the Operating Partnership [Line Items]
Total units outstanding ( in shares)		11,477,041	11,678,991	11,668,061	[1]	12,195,603	[1]
Cash redemption of OP Units (in shares)	[1]	201,950	7,064	2,206,613
[1]	Consists of limited partnership interests held by third parties.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Schedule) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Minimum
Fair Value of Financial Instruments (Details) [Line Items]
Interest rate (in percentage)	4.20%
Maximum
Fair Value of Financial Instruments (Details) [Line Items]
Interest rate (in percentage)	4.40%
Weighted Average
Fair Value of Financial Instruments (Details) [Line Items]
Interest rate (in percentage)	4.30%
Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Details) [Line Items]
Notes payable, fair value	$ 86.3
Senior Notes | Significant Unobservable Inputs (Level 3) | Senior Notes Due 2027
Fair Value of Financial Instruments (Details) [Line Items]
Long-term debt, fair value	223.7
Senior Notes | Significant Unobservable Inputs (Level 3) | Senior Notes Due 2026
Fair Value of Financial Instruments (Details) [Line Items]
Long-term debt, fair value	178.4
Senior Notes | Significant Other Observable Inputs (Level 2) | Senior Notes Due 2024
Fair Value of Financial Instruments (Details) [Line Items]
Long-term debt, fair value	236.9
Senior Notes | Significant Other Observable Inputs (Level 2) | Senior Notes Due 2023
Fair Value of Financial Instruments (Details) [Line Items]
Long-term debt, fair value	$ 249.3

Derivative and Hedging Activi_3

Derivative and Hedging Activities (Assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
In the next 12 months will be reclassified as an increase to interest expense	$ 1,200
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring
Derivative [Line Items]
Derivative asset	4,931	$ 4,321
Derivative liability	(580)
Interest Rate Swap [Member] | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Fair Value, Measurements, Recurring
Derivative [Line Items]
Derivative asset	0	0
Derivative liability	0
Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Derivative [Line Items]
Derivative asset	4,931	4,321
Derivative liability	(580)
Interest Rate Swap [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Derivative [Line Items]
Derivative asset	0	0
Derivative liability	0
Interest Rate Swap [Member] | Other assets | Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset	4,931	4,321
Interest Rate Swap [Member] | Other liabilities | Designated as Hedging Instrument
Derivative [Line Items]
Derivative liability	(580)	$ 0
Interest Rate Swap Maturing 1/31/2019 | Bank of Montreal | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	50,000
Interest Rate Swap Maturing 1/31/2019 | Regions Bank | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	50,000
Interest Rate Swap Maturing 8/31/2022 | Bank of Montreal | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	100,000
Interest Rate Swap Maturing 8/31/2022 | U.S. Bank | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	100,000
Forward Starting Interest Rate Swap Maturing August Thirty First Twenty Twenty Two [Member] | Regions Bank | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	50,000
Forward Starting Interest Rate Swap Maturing August Thirty First Twenty Twenty Two [Member] | Royal Bank of Canada [Member] | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	$ 50,000

Derivative and Hedging Activi_4

Derivative and Hedging Activities (Details) - Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of gain recognized in OCI on derivatives	$ 1,648	$ 3,665	$ 541
Amount of loss reclassified from AOCI into interest	$ 57	$ 1,920	$ 2,473

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended			28 Months Ended
	Sep. 30, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Commitments and Contingencies (Details) [Line Items]
Rent expense		$ 2,000	$ 1,500	$ 831
Tax protection agreements, period (in years)					10 years
Terranomics Crossroads Associates LP Member and SARM Five Points LLC [Member]
Commitments and Contingencies (Details) [Line Items]
Tax protection agreements, period (in years)	12 years

Commitments and Contingencies_3

Commitments and Contingencies (Details) - Future Minimum Annual Lease Payments Under Operating Leases $ in Thousands	Dec. 31, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,019	$ 1,280
2,020	1,287
2,021	1,283
2,022	1,304
2,023	1,330
Thereafter	33,939
Total minimum lease payments	$ 40,423

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Lease Agreements | General and Administrative Expense
Related Party Transactions (Details) [Line Items]
SG&A expense with related party	$ 74	$ 52	$ 46

Quarterly Results of Operatio_3

Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for ROIC - 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
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 75,158	$ 73,904	$ 72,341	$ 74,395	$ 72,754	$ 67,966	$ 66,640	$ 65,900	$ 295,798	$ 273,260	$ 237,189
Net income	11,568	15,647	8,102	11,824	12,113	10,127	9,197	11,251	47,141	42,688	36,430
Net income attributable to ROIC	$ 10,501	$ 14,194	$ 7,339	$ 10,702	$ 10,849	$ 9,149	$ 8,309	$ 10,170	$ 42,736	$ 38,477	$ 32,754
Earnings per share - basic and diluted (in usd per share)	$ 0.09	$ 0.12	$ 0.06	$ 0.09	$ 0.10	$ 0.08	$ 0.08	$ 0.09	$ 0.38	$ 0.35	$ 0.31

Quarterly Results of Operatio_4

Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for the Operating Partnership - 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
Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for the Operating Partnership [Line Items]
Total revenues	$ 75,158	$ 73,904	$ 72,341	$ 74,395	$ 72,754	$ 67,966	$ 66,640	$ 65,900	$ 295,798	$ 273,260	$ 237,189
Net income attributable to the Operating Partnership	$ 11,568	$ 15,647	$ 8,102	$ 11,824	$ 12,113	$ 10,127	$ 9,197	$ 11,251	$ 47,141	$ 42,688	$ 36,430
Earnings per unit - basic and diluted (in usd per share)	$ 0.09	$ 0.12	$ 0.06	$ 0.09	$ 0.10	$ 0.08	$ 0.08	$ 0.09	$ 0.38	$ 0.35	$ 0.31
Retail Opportunity Investments Partnership L.P.
Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for the Operating Partnership [Line Items]
Total revenues	$ 75,158	$ 73,904	$ 72,341	$ 74,395	$ 72,754	$ 67,966	$ 66,640	$ 65,900	$ 295,798	$ 273,260	$ 237,189
Net income attributable to the Operating Partnership	$ 11,568	$ 15,647	$ 8,102	$ 11,824	$ 12,113	$ 10,127	$ 9,197	$ 11,251	$ 47,141	$ 42,688	$ 36,430
Earnings per unit - basic and diluted (in usd per share)	$ 0.09	$ 0.12	$ 0.06	$ 0.09	$ 0.10	$ 0.08	$ 0.08	$ 0.09	$ 0.38	$ 0.35	$ 0.31

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 19, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 15, 2019
Subsequent Events (Details) [Line Items]
Dividends per share (in dollars per share)		$ 0.78	$ 0.75	$ 0.72
Subsequent Event
Subsequent Events (Details) [Line Items]
Dividends per share (in dollars per share)	$ 0.1970
Vancouver Market Center | Vancouver, Washington [Member] | Subsequent Event
Subsequent Events (Details) [Line Items]
Sales Price of Property Sold					$ 17

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation - Summary (Details) $ in Billions	12 Months Ended
	Dec. 31, 2018USD ($)
Schedule III - Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate, Federal Income Tax Basis (in Dollars)	$ 2.9
Minimum | Building
Schedule III - Real Estate and Accumulated Depreciation [Line Items]
PPE useful life (in years)	39 years
Minimum | Building Improvements
Schedule III - Real Estate and Accumulated Depreciation [Line Items]
PPE useful life (in years)	10 years
Maximum | Building
Schedule III - Real Estate and Accumulated Depreciation [Line Items]
PPE useful life (in years)	40 years
Maximum | Building Improvements
Schedule III - Real Estate and Accumulated Depreciation [Line Items]
PPE useful life (in years)	20 years

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation (Details) - Real Estate and Accumulated Depreciation - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Encumbrances	$ 86,708
Initial Cost to Company, Land	892,736
Initial Cost to Company, Buildings & Improvements	2,059,275
Cost Capitalized Subsequent to Acquisition, Land	1,504
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	206,957
Amount at Which Carried at Close of Period. Land	894,240
Amount at Which Carried at Close of Period, Buildings & Improvements	2,266,232
Total real estate investments	3,160,472	$ 3,109,397	$ 2,687,018	$ 2,296,617
Accumulated Depreciation	329,207
Paramount Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,347
Initial Cost to Company, Buildings & Improvements	10,274
Cost Capitalized Subsequent to Acquisition, Land	447
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,227
Amount at Which Carried at Close of Period. Land	6,794
Amount at Which Carried at Close of Period, Buildings & Improvements	12,501
Total real estate investments	19,295
Accumulated Depreciation	$ 3,571
Date of Acquisition	Dec. 22, 2009
Santa Ana Downtown Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,895
Initial Cost to Company, Buildings & Improvements	9,890
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,856
Amount at Which Carried at Close of Period. Land	7,895
Amount at Which Carried at Close of Period, Buildings & Improvements	13,746
Total real estate investments	21,641
Accumulated Depreciation	$ 3,281
Date of Acquisition	Jan. 26, 2010
Meridian Valley Plaza, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,881
Initial Cost to Company, Buildings & Improvements	4,795
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,724
Amount at Which Carried at Close of Period. Land	1,881
Amount at Which Carried at Close of Period, Buildings & Improvements	6,519
Total real estate investments	8,400
Accumulated Depreciation	$ 1,696
Date of Acquisition	Feb. 1, 2010
The Market at Lake Stevens, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,087
Initial Cost to Company, Buildings & Improvements	12,397
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	408
Amount at Which Carried at Close of Period. Land	3,087
Amount at Which Carried at Close of Period, Buildings & Improvements	12,805
Total real estate investments	15,892
Accumulated Depreciation	$ 3,394
Date of Acquisition	Mar. 16, 2010
Norwood Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,031
Initial Cost to Company, Buildings & Improvements	11,534
Cost Capitalized Subsequent to Acquisition, Land	122
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,253
Amount at Which Carried at Close of Period. Land	3,153
Amount at Which Carried at Close of Period, Buildings & Improvements	12,787
Total real estate investments	15,940
Accumulated Depreciation	$ 3,419
Date of Acquisition	Apr. 5, 2010
Pleasant Hill Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,359
Initial Cost to Company, Buildings & Improvements	6,927
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,590
Amount at Which Carried at Close of Period. Land	6,359
Amount at Which Carried at Close of Period, Buildings & Improvements	8,517
Total real estate investments	14,876
Accumulated Depreciation	$ 2,396
Date of Acquisition	Apr. 8, 2010
Vancouver Market Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,080
Initial Cost to Company, Buildings & Improvements	6,912
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,981
Amount at Which Carried at Close of Period. Land	4,080
Amount at Which Carried at Close of Period, Buildings & Improvements	10,893
Total real estate investments	14,973
Accumulated Depreciation	$ 2,356
Date of Acquisition	Jun. 17, 2010
Happy Valley Town Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 11,678
Initial Cost to Company, Buildings & Improvements	27,011
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,564
Amount at Which Carried at Close of Period. Land	11,678
Amount at Which Carried at Close of Period, Buildings & Improvements	29,575
Total real estate investments	41,253
Accumulated Depreciation	$ 7,539
Date of Acquisition	Jul. 14, 2010
Cascade Summit Town Square, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,853
Initial Cost to Company, Buildings & Improvements	7,732
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	421
Amount at Which Carried at Close of Period. Land	8,853
Amount at Which Carried at Close of Period, Buildings & Improvements	8,153
Total real estate investments	17,006
Accumulated Depreciation	$ 2,595
Date of Acquisition	Aug. 20, 2010
Heritage Market Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,595
Initial Cost to Company, Buildings & Improvements	17,399
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	771
Amount at Which Carried at Close of Period. Land	6,595
Amount at Which Carried at Close of Period, Buildings & Improvements	18,170
Total real estate investments	24,765
Accumulated Depreciation	$ 4,442
Date of Acquisition	Sep. 23, 2010
Claremont Promenade, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,975
Initial Cost to Company, Buildings & Improvements	1,019
Cost Capitalized Subsequent to Acquisition, Land	183
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,402
Amount at Which Carried at Close of Period. Land	6,158
Amount at Which Carried at Close of Period, Buildings & Improvements	5,421
Total real estate investments	11,579
Accumulated Depreciation	$ 2,383
Date of Acquisition	Sep. 23, 2010
Sycamore Creek, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,747
Initial Cost to Company, Buildings & Improvements	11,584
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	582
Amount at Which Carried at Close of Period. Land	3,747
Amount at Which Carried at Close of Period, Buildings & Improvements	12,166
Total real estate investments	15,913
Accumulated Depreciation	$ 3,572
Date of Acquisition	Sep. 30, 2010
Gateway Village, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,917
Initial Cost to Company, Buildings & Improvements	27,298
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	989
Amount at Which Carried at Close of Period. Land	5,917
Amount at Which Carried at Close of Period, Buildings & Improvements	28,287
Total real estate investments	34,204
Accumulated Depreciation	$ 6,624
Date of Acquisition	Dec. 16, 2010
Division Crossing, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,706
Initial Cost to Company, Buildings & Improvements	8,327
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	5,700
Amount at Which Carried at Close of Period. Land	3,706
Amount at Which Carried at Close of Period, Buildings & Improvements	14,027
Total real estate investments	17,733
Accumulated Depreciation	$ 3,980
Date of Acquisition	Dec. 22, 2010
Halsey Crossing, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Buildings & Improvements	$ 7,773
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	7,690
Amount at Which Carried at Close of Period, Buildings & Improvements	15,463
Total real estate investments	15,463
Accumulated Depreciation	$ 2,914
Date of Acquisition	Dec. 22, 2010
Marketplace Del Rio,CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 13,420
Initial Cost to Company, Buildings & Improvements	22,251
Cost Capitalized Subsequent to Acquisition, Land	9
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,462
Amount at Which Carried at Close of Period. Land	13,429
Amount at Which Carried at Close of Period, Buildings & Improvements	24,713
Total real estate investments	38,142
Accumulated Depreciation	$ 6,357
Date of Acquisition	Jan. 3, 2011
Pinole Vista Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 12,894
Initial Cost to Company, Buildings & Improvements	35,689
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,247
Amount at Which Carried at Close of Period. Land	12,894
Amount at Which Carried at Close of Period, Buildings & Improvements	39,936
Total real estate investments	52,830
Accumulated Depreciation	6,424
Desert Springs Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,517
Initial Cost to Company, Buildings & Improvements	18,761
Cost Capitalized Subsequent to Acquisition, Land	443
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	6,568
Amount at Which Carried at Close of Period. Land	8,960
Amount at Which Carried at Close of Period, Buildings & Improvements	25,329
Total real estate investments	34,289
Accumulated Depreciation	$ 5,693
Date of Acquisition	Feb. 17, 2011
Mills Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,084
Initial Cost to Company, Buildings & Improvements	16,833
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	11,693
Amount at Which Carried at Close of Period. Land	4,084
Amount at Which Carried at Close of Period, Buildings & Improvements	28,526
Total real estate investments	32,610
Accumulated Depreciation	$ 8,137
Date of Acquisition	Feb. 17, 2011
Morada Ranch, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 2,504
Initial Cost to Company, Buildings & Improvements	19,547
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	791
Amount at Which Carried at Close of Period. Land	2,504
Amount at Which Carried at Close of Period, Buildings & Improvements	20,338
Total real estate investments	22,842
Accumulated Depreciation	$ 4,717
Date of Acquisition	May 20, 2011
Renaissance Towne Centre, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,640
Initial Cost to Company, Buildings & Improvements	13,848
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,667
Amount at Which Carried at Close of Period. Land	8,640
Amount at Which Carried at Close of Period, Buildings & Improvements	15,515
Total real estate investments	24,155
Accumulated Depreciation	$ 2,987
Date of Acquisition	Aug. 3, 2011
Country Club Gate Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,487
Initial Cost to Company, Buildings & Improvements	17,341
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,208
Amount at Which Carried at Close of Period. Land	6,487
Amount at Which Carried at Close of Period, Buildings & Improvements	18,549
Total real estate investments	25,036
Accumulated Depreciation	$ 4,403
Date of Acquisition	Jul. 8, 2011
Canyon Park Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,352
Initial Cost to Company, Buildings & Improvements	15,916
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8,757
Amount at Which Carried at Close of Period. Land	9,352
Amount at Which Carried at Close of Period, Buildings & Improvements	24,673
Total real estate investments	34,025
Accumulated Depreciation	$ 5,284
Date of Acquisition	Jul. 29, 2011
Hawks Prairie Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,334
Initial Cost to Company, Buildings & Improvements	20,694
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,224
Amount at Which Carried at Close of Period. Land	5,334
Amount at Which Carried at Close of Period, Buildings & Improvements	22,918
Total real estate investments	28,252
Accumulated Depreciation	$ 4,657
Date of Acquisition	Sep. 8, 2011
The Kress Building, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,693
Initial Cost to Company, Buildings & Improvements	20,866
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,825
Amount at Which Carried at Close of Period. Land	5,693
Amount at Which Carried at Close of Period, Buildings & Improvements	25,691
Total real estate investments	31,384
Accumulated Depreciation	$ 6,179
Date of Acquisition	Sep. 30, 2011
Hillsboro Market Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Buildings & Improvements	$ 17,553
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,493
Amount at Which Carried at Close of Period, Buildings & Improvements	21,046
Total real estate investments	21,046
Accumulated Depreciation	$ 4,295
Date of Acquisition	Nov. 23, 2011
Gateway Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,242
Initial Cost to Company, Buildings & Improvements	23,462
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8
Amount at Which Carried at Close of Period. Land	6,242
Amount at Which Carried at Close of Period, Buildings & Improvements	23,470
Total real estate investments	29,712
Accumulated Depreciation	$ 4,582
Date of Acquisition	Feb. 16, 2012
Euclid Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,407
Initial Cost to Company, Buildings & Improvements	7,753
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,905
Amount at Which Carried at Close of Period. Land	7,407
Amount at Which Carried at Close of Period, Buildings & Improvements	10,658
Total real estate investments	18,065
Accumulated Depreciation	$ 2,954
Date of Acquisition	Mar. 28, 2012
Green Valley Station, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,685
Initial Cost to Company, Buildings & Improvements	8,999
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	591
Amount at Which Carried at Close of Period. Land	1,685
Amount at Which Carried at Close of Period, Buildings & Improvements	9,590
Total real estate investments	11,275
Accumulated Depreciation	$ 2,292
Date of Acquisition	Apr. 2, 2012
Aurora Square, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,325
Initial Cost to Company, Buildings & Improvements	13,336
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,906
Amount at Which Carried at Close of Period. Land	10,325
Amount at Which Carried at Close of Period, Buildings & Improvements	15,242
Total real estate investments	25,567
Accumulated Depreciation	2,220
Marlin Cove Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,815
Initial Cost to Company, Buildings & Improvements	6,797
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,084
Amount at Which Carried at Close of Period. Land	8,815
Amount at Which Carried at Close of Period, Buildings & Improvements	8,881
Total real estate investments	17,696
Accumulated Depreciation	$ 2,212
Date of Acquisition	May 4, 2012
Seabridge Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,098
Initial Cost to Company, Buildings & Improvements	17,164
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,482
Amount at Which Carried at Close of Period. Land	5,098
Amount at Which Carried at Close of Period, Buildings & Improvements	20,646
Total real estate investments	25,744
Accumulated Depreciation	$ 3,798
Date of Acquisition	May 31, 2012
The Village at Novato, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,329
Initial Cost to Company, Buildings & Improvements	4,412
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,550
Amount at Which Carried at Close of Period. Land	5,329
Amount at Which Carried at Close of Period, Buildings & Improvements	5,962
Total real estate investments	11,291
Accumulated Depreciation	$ 1,044
Date of Acquisition	Jul. 24, 2012
Glendora Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,847
Initial Cost to Company, Buildings & Improvements	8,758
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	211
Amount at Which Carried at Close of Period. Land	5,847
Amount at Which Carried at Close of Period, Buildings & Improvements	8,969
Total real estate investments	14,816
Accumulated Depreciation	$ 2,062
Date of Acquisition	Aug. 1, 2012
Wilsonville Old Town Square, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,181
Initial Cost to Company, Buildings & Improvements	15,394
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	509
Amount at Which Carried at Close of Period. Land	4,181
Amount at Which Carried at Close of Period, Buildings & Improvements	15,903
Total real estate investments	20,084
Accumulated Depreciation	$ 3,122
Date of Acquisition	Aug. 1, 2012
Bay Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,454
Initial Cost to Company, Buildings & Improvements	14,857
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,096
Amount at Which Carried at Close of Period. Land	5,454
Amount at Which Carried at Close of Period, Buildings & Improvements	15,953
Total real estate investments	21,407
Accumulated Depreciation	$ 3,161
Date of Acquisition	Oct. 5, 2012
Santa Teresa Village, CA
Real Estate Properties [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land	14,965
Initial Cost to Company, Buildings & Improvements	17,162
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	5,539
Amount at Which Carried at Close of Period. Land	14,965
Amount at Which Carried at Close of Period, Buildings & Improvements	22,701
Total real estate investments	37,666
Accumulated Depreciation	$ 4,819
Date of Acquisition	Nov. 8, 2012
Cypress Center West, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 15,480
Initial Cost to Company, Buildings & Improvements	11,819
Cost Capitalized Subsequent to Acquisition, Land	121
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,065
Amount at Which Carried at Close of Period. Land	15,601
Amount at Which Carried at Close of Period, Buildings & Improvements	13,884
Total real estate investments	29,485
Accumulated Depreciation	$ 3,129
Date of Acquisition	Dec. 7, 2012
Redondo Beach Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,242
Initial Cost to Company, Buildings & Improvements	13,625
Cost Capitalized Subsequent to Acquisition, Land	55
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	217
Amount at Which Carried at Close of Period. Land	16,297
Amount at Which Carried at Close of Period, Buildings & Improvements	13,842
Total real estate investments	30,139
Accumulated Depreciation	$ 2,659
Date of Acquisition	Dec. 28, 2012
Harbor Place Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,506
Initial Cost to Company, Buildings & Improvements	10,527
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	289
Amount at Which Carried at Close of Period. Land	16,506
Amount at Which Carried at Close of Period, Buildings & Improvements	10,816
Total real estate investments	27,322
Accumulated Depreciation	$ 1,932
Date of Acquisition	Dec. 28, 2012
Diamond Bar Town Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,540
Initial Cost to Company, Buildings & Improvements	16,795
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,542
Amount at Which Carried at Close of Period. Land	9,540
Amount at Which Carried at Close of Period, Buildings & Improvements	20,337
Total real estate investments	29,877
Accumulated Depreciation	$ 4,662
Date of Acquisition	Feb. 1, 2013
Bernardo Heights Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,192
Initial Cost to Company, Buildings & Improvements	8,940
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	727
Amount at Which Carried at Close of Period. Land	3,192
Amount at Which Carried at Close of Period, Buildings & Improvements	9,667
Total real estate investments	12,859
Accumulated Depreciation	$ 1,869
Date of Acquisition	Feb. 6, 2013
Canyon Crossing, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,941
Initial Cost to Company, Buildings & Improvements	24,659
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,946
Amount at Which Carried at Close of Period. Land	7,941
Amount at Which Carried at Close of Period, Buildings & Improvements	27,605
Total real estate investments	35,546
Accumulated Depreciation	$ 5,808
Date of Acquisition	Apr. 15, 2013
Diamond Hills Plaza, CA
Real Estate Properties [Line Items]
Encumbrances	$ 35,500
Initial Cost to Company, Land	15,458
Initial Cost to Company, Buildings & Improvements	29,353
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	357
Amount at Which Carried at Close of Period. Land	15,458
Amount at Which Carried at Close of Period, Buildings & Improvements	29,710
Total real estate investments	45,168
Accumulated Depreciation	$ 5,310
Date of Acquisition	Apr. 22, 2013
Granada Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,673
Initial Cost to Company, Buildings & Improvements	13,459
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	491
Amount at Which Carried at Close of Period. Land	3,673
Amount at Which Carried at Close of Period, Buildings & Improvements	13,950
Total real estate investments	17,623
Accumulated Depreciation	$ 2,536
Date of Acquisition	Jun. 27, 2013
Hawthorne Crossings, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,383
Initial Cost to Company, Buildings & Improvements	29,277
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	127
Amount at Which Carried at Close of Period. Land	10,383
Amount at Which Carried at Close of Period, Buildings & Improvements	29,404
Total real estate investments	39,787
Accumulated Depreciation	$ 4,805
Date of Acquisition	Jun. 27, 2013
Robinwood Shopping Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,997
Initial Cost to Company, Buildings & Improvements	11,317
Cost Capitalized Subsequent to Acquisition, Land	18
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,064
Amount at Which Carried at Close of Period. Land	4,015
Amount at Which Carried at Close of Period, Buildings & Improvements	12,381
Total real estate investments	16,396
Accumulated Depreciation	$ 2,278
Date of Acquisition	Aug. 23, 2013
5 Points Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 17,920
Initial Cost to Company, Buildings & Improvements	36,965
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	4,082
Amount at Which Carried at Close of Period. Land	17,920
Amount at Which Carried at Close of Period, Buildings & Improvements	41,047
Total real estate investments	58,967
Accumulated Depreciation	$ 6,358
Date of Acquisition	Sep. 27, 2013
Crossroads Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 68,366
Initial Cost to Company, Buildings & Improvements	67,756
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	17,984
Amount at Which Carried at Close of Period. Land	68,366
Amount at Which Carried at Close of Period, Buildings & Improvements	85,740
Total real estate investments	154,106
Accumulated Depreciation	$ 14,039
Date of Acquisition	Sep. 27, 2013
Peninsula Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 14,730
Initial Cost to Company, Buildings & Improvements	19,214
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,958
Amount at Which Carried at Close of Period. Land	14,730
Amount at Which Carried at Close of Period, Buildings & Improvements	21,172
Total real estate investments	35,902
Accumulated Depreciation	$ 3,572
Date of Acquisition	Nov. 1, 2013
Country Club Village, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,986
Initial Cost to Company, Buildings & Improvements	26,579
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,017
Amount at Which Carried at Close of Period. Land	9,986
Amount at Which Carried at Close of Period, Buildings & Improvements	28,596
Total real estate investments	38,582
Accumulated Depreciation	$ 5,188
Date of Acquisition	Nov. 26, 2013
Plaza de la Canada, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,351
Initial Cost to Company, Buildings & Improvements	24,819
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	519
Amount at Which Carried at Close of Period. Land	10,351
Amount at Which Carried at Close of Period, Buildings & Improvements	25,338
Total real estate investments	35,689
Accumulated Depreciation	$ 3,777
Date of Acquisition	Dec. 13, 2013
Tigard Marketplace, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 13,587
Initial Cost to Company, Buildings & Improvements	9,603
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	565
Amount at Which Carried at Close of Period. Land	13,587
Amount at Which Carried at Close of Period, Buildings & Improvements	10,168
Total real estate investments	23,755
Accumulated Depreciation	$ 2,128
Date of Acquisition	Feb. 18, 2014
Creekside Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 14,807
Initial Cost to Company, Buildings & Improvements	29,476
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,351
Amount at Which Carried at Close of Period. Land	14,807
Amount at Which Carried at Close of Period, Buildings & Improvements	30,827
Total real estate investments	45,634
Accumulated Depreciation	$ 4,980
Date of Acquisition	Feb. 28, 2014
North Park Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 13,593
Initial Cost to Company, Buildings & Improvements	17,733
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	832
Amount at Which Carried at Close of Period. Land	13,593
Amount at Which Carried at Close of Period, Buildings & Improvements	18,565
Total real estate investments	32,158
Accumulated Depreciation	$ 2,473
Date of Acquisition	Apr. 30, 2014
Fallbrook Shopping Center
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 21,232
Initial Cost to Company, Buildings & Improvements	186,197
Cost Capitalized Subsequent to Acquisition, Land	83
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	9,286
Amount at Which Carried at Close of Period. Land	21,315
Amount at Which Carried at Close of Period, Buildings & Improvements	195,483
Total real estate investments	216,798
Accumulated Depreciation	$ 26,910
Date of Acquisition	Jun. 13, 2014
Moorpark Town Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 7,063
Initial Cost to Company, Buildings & Improvements	19,694
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,562
Amount at Which Carried at Close of Period. Land	7,063
Amount at Which Carried at Close of Period, Buildings & Improvements	21,256
Total real estate investments	28,319
Accumulated Depreciation	$ 3,569
Date of Acquisition	Dec. 4, 2014
Mission Foothill Marketplace, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 11,415
Initial Cost to Company, Buildings & Improvements	17,783
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	107
Amount at Which Carried at Close of Period. Land	11,415
Amount at Which Carried at Close of Period, Buildings & Improvements	17,890
Total real estate investments	29,305
Accumulated Depreciation	$ 1,334
Date of Acquisition	Dec. 4, 2014
Wilsonville Town Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,334
Initial Cost to Company, Buildings & Improvements	27,101
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	622
Amount at Which Carried at Close of Period. Land	10,334
Amount at Which Carried at Close of Period, Buildings & Improvements	27,723
Total real estate investments	38,057
Accumulated Depreciation	$ 3,666
Date of Acquisition	Dec. 11, 2014
Park Oaks Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,527
Initial Cost to Company, Buildings & Improvements	38,064
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	629
Amount at Which Carried at Close of Period. Land	8,527
Amount at Which Carried at Close of Period, Buildings & Improvements	38,693
Total real estate investments	47,220
Accumulated Depreciation	$ 4,803
Date of Acquisition	Jan. 6, 2016
Ontario Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,825
Initial Cost to Company, Buildings & Improvements	26,635
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,499
Amount at Which Carried at Close of Period. Land	9,825
Amount at Which Carried at Close of Period, Buildings & Improvements	28,134
Total real estate investments	37,959
Accumulated Depreciation	$ 3,707
Date of Acquisition	Jan. 6, 2015
Winston Manor, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,018
Initial Cost to Company, Buildings & Improvements	9,762
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,854
Amount at Which Carried at Close of Period. Land	10,018
Amount at Which Carried at Close of Period, Buildings & Improvements	11,616
Total real estate investments	21,634
Accumulated Depreciation	$ 1,626
Date of Acquisition	Jan. 7, 2015
Jackson Square, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,886
Initial Cost to Company, Buildings & Improvements	24,558
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	921
Amount at Which Carried at Close of Period. Land	6,886
Amount at Which Carried at Close of Period, Buildings & Improvements	25,479
Total real estate investments	32,365
Accumulated Depreciation	$ 2,796
Date of Acquisition	Jul. 1, 2015
Tigard Promenade, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,844
Initial Cost to Company, Buildings & Improvements	10,843
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	101
Amount at Which Carried at Close of Period. Land	9,844
Amount at Which Carried at Close of Period, Buildings & Improvements	10,944
Total real estate investments	20,788
Accumulated Depreciation	$ 1,173
Date of Acquisition	Jul. 28, 2015
Sunnyside Village Square, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,428
Initial Cost to Company, Buildings & Improvements	13,324
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,412
Amount at Which Carried at Close of Period. Land	4,428
Amount at Which Carried at Close of Period, Buildings & Improvements	16,736
Total real estate investments	21,164
Accumulated Depreciation	$ 1,996
Date of Acquisition	Jul. 28, 2015
Gateway Centre, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,275
Initial Cost to Company, Buildings & Improvements	28,308
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,720
Amount at Which Carried at Close of Period. Land	16,275
Amount at Which Carried at Close of Period, Buildings & Improvements	32,028
Total real estate investments	48,303
Accumulated Depreciation	$ 3,169
Date of Acquisition	Sep. 1, 2015
Johnson Creek Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,009
Initial Cost to Company, Buildings & Improvements	22,534
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,243
Amount at Which Carried at Close of Period. Land	9,009
Amount at Which Carried at Close of Period, Buildings & Improvements	23,777
Total real estate investments	32,786
Accumulated Depreciation	$ 2,510
Date of Acquisition	Nov. 9, 2015
Iron Horse Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 8,187
Initial Cost to Company, Buildings & Improvements	39,654
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,571
Amount at Which Carried at Close of Period. Land	8,187
Amount at Which Carried at Close of Period, Buildings & Improvements	41,225
Total real estate investments	49,412
Accumulated Depreciation	$ 3,400
Date of Acquisition	Dec. 4, 2015
Bellevue Marketplace, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,488
Initial Cost to Company, Buildings & Improvements	39,119
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8,385
Amount at Which Carried at Close of Period. Land	10,488
Amount at Which Carried at Close of Period, Buildings & Improvements	47,504
Total real estate investments	57,992
Accumulated Depreciation	$ 3,972
Date of Acquisition	Dec. 10, 2015
Four Corner Square, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,926
Initial Cost to Company, Buildings & Improvements	31,415
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	350
Amount at Which Carried at Close of Period. Land	9,926
Amount at Which Carried at Close of Period, Buildings & Improvements	31,765
Total real estate investments	41,691
Accumulated Depreciation	$ 3,123
Date of Acquisition	Dec. 21, 2015
Warner Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 16,104
Initial Cost to Company, Buildings & Improvements	60,188
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	8,834
Amount at Which Carried at Close of Period. Land	16,104
Amount at Which Carried at Close of Period, Buildings & Improvements	69,022
Total real estate investments	85,126
Accumulated Depreciation	$ 6,067
Date of Acquisition	Dec. 31, 2015
Magnolia Shopping Center, CA
Real Estate Properties [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land	12,501
Initial Cost to Company, Buildings & Improvements	27,040
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,866
Amount at Which Carried at Close of Period. Land	12,501
Amount at Which Carried at Close of Period, Buildings & Improvements	28,906
Total real estate investments	41,407
Accumulated Depreciation	$ 2,545
Date of Acquisition	Mar. 10, 2016
Casitas Plaza Shopping Center, CA
Real Estate Properties [Line Items]
Encumbrances	$ 7,158
Initial Cost to Company, Land	10,734
Initial Cost to Company, Buildings & Improvements	22,040
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	961
Amount at Which Carried at Close of Period. Land	10,734
Amount at Which Carried at Close of Period, Buildings & Improvements	23,001
Total real estate investments	33,735
Accumulated Depreciation	$ 1,825
Date of Acquisition	Mar. 10, 2016
Bouquet Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,040
Initial Cost to Company, Buildings & Improvements	48,362
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	479
Amount at Which Carried at Close of Period. Land	10,040
Amount at Which Carried at Close of Period, Buildings & Improvements	48,841
Total real estate investments	58,881
Accumulated Depreciation	$ 3,891
Date of Acquisition	Apr. 28, 2016
North Ranch Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 31,522
Initial Cost to Company, Buildings & Improvements	95,916
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,061
Amount at Which Carried at Close of Period. Land	31,522
Amount at Which Carried at Close of Period, Buildings & Improvements	96,977
Total real estate investments	128,499
Accumulated Depreciation	$ 6,884
Date of Acquisition	Jun. 1, 2016
Monterey Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,073
Initial Cost to Company, Buildings & Improvements	10,609
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	(36)
Amount at Which Carried at Close of Period. Land	1,073
Amount at Which Carried at Close of Period, Buildings & Improvements	10,573
Total real estate investments	11,646
Accumulated Depreciation	$ 753
Date of Acquisition	Jul. 14, 2016
Rose City Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 3,637
Initial Cost to Company, Buildings & Improvements	10,301
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	(78)
Amount at Which Carried at Close of Period. Land	3,637
Amount at Which Carried at Close of Period, Buildings & Improvements	10,223
Total real estate investments	13,860
Accumulated Depreciation	$ 690
Date of Acquisition	Sep. 15, 2016
The Knolls, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 9,726
Initial Cost to Company, Buildings & Improvements	18,299
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	20
Amount at Which Carried at Close of Period. Land	9,726
Amount at Which Carried at Close of Period, Buildings & Improvements	18,319
Total real estate investments	28,045
Accumulated Depreciation	$ 1,265
Date of Acquisition	Oct. 3, 2016
Bridle Trails Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 11,534
Initial Cost to Company, Buildings & Improvements	20,700
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	3,633
Amount at Which Carried at Close of Period. Land	11,534
Amount at Which Carried at Close of Period, Buildings & Improvements	24,333
Total real estate investments	35,867
Accumulated Depreciation	$ 1,551
Date of Acquisition	Oct. 17, 2016
Torrey Hills Corporate Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,579
Initial Cost to Company, Buildings & Improvements	3,915
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	2,435
Amount at Which Carried at Close of Period. Land	5,579
Amount at Which Carried at Close of Period, Buildings & Improvements	6,350
Total real estate investments	11,929
Accumulated Depreciation	$ 662
Date of Acquisition	Dec. 6, 2016
PCC Community Markets Plaza, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,856
Initial Cost to Company, Buildings & Improvements	6,914
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	7
Amount at Which Carried at Close of Period. Land	1,856
Amount at Which Carried at Close of Period, Buildings & Improvements	6,921
Total real estate investments	8,777
Accumulated Depreciation	$ 432
Date of Acquisition	Jan. 25, 2017
The Terraces, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 18,378
Initial Cost to Company, Buildings & Improvements	37,103
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	505
Amount at Which Carried at Close of Period. Land	18,378
Amount at Which Carried at Close of Period, Buildings & Improvements	37,608
Total real estate investments	55,986
Accumulated Depreciation	$ 2,046
Date of Acquisition	Mar. 17, 2017
Santa Rosa Southside Shopping Center, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,595
Initial Cost to Company, Buildings & Improvements	24,453
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,477
Amount at Which Carried at Close of Period. Land	5,595
Amount at Which Carried at Close of Period, Buildings & Improvements	25,930
Total real estate investments	31,525
Accumulated Depreciation	$ 1,308
Date of Acquisition	Mar. 24, 2017
Division Center, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 6,917
Initial Cost to Company, Buildings & Improvements	26,098
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	1,421
Amount at Which Carried at Close of Period. Land	6,917
Amount at Which Carried at Close of Period, Buildings & Improvements	27,519
Total real estate investments	34,436
Accumulated Depreciation	$ 1,433
Date of Acquisition	Apr. 5, 2017
Highland Hill Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 10,511
Initial Cost to Company, Buildings & Improvements	37,825
Cost Capitalized Subsequent to Acquisition, Land	23
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	397
Amount at Which Carried at Close of Period. Land	10,534
Amount at Which Carried at Close of Period, Buildings & Improvements	38,222
Total real estate investments	48,756
Accumulated Depreciation	$ 2,018
Date of Acquisition	May 9, 2017
Monta Loma Plaza, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 18,226
Initial Cost to Company, Buildings & Improvements	11,113
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	57
Amount at Which Carried at Close of Period. Land	18,226
Amount at Which Carried at Close of Period, Buildings & Improvements	11,170
Total real estate investments	29,396
Accumulated Depreciation	$ 426
Date of Acquisition	Sep. 19, 2017
Fullerton Crossroads, CA
Real Estate Properties [Line Items]
Encumbrances	$ 26,000
Initial Cost to Company, Land	28,512
Initial Cost to Company, Buildings & Improvements	45,419
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	234
Amount at Which Carried at Close of Period. Land	28,512
Amount at Which Carried at Close of Period, Buildings & Improvements	45,653
Total real estate investments	74,165
Accumulated Depreciation	$ 1,776
Date of Acquisition	Oct. 11, 2017
Riverstone Marketplace, CA
Real Estate Properties [Line Items]
Encumbrances	$ 18,050
Initial Cost to Company, Land	5,113
Initial Cost to Company, Buildings & Improvements	27,594
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	117
Amount at Which Carried at Close of Period. Land	5,113
Amount at Which Carried at Close of Period, Buildings & Improvements	27,711
Total real estate investments	32,824
Accumulated Depreciation	$ 1,046
Date of Acquisition	Oct. 11, 2017
North Lynnwood Shopping Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 4,955
Initial Cost to Company, Buildings & Improvements	10,335
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	117
Amount at Which Carried at Close of Period. Land	4,955
Amount at Which Carried at Close of Period, Buildings & Improvements	10,452
Total real estate investments	15,407
Accumulated Depreciation	$ 401
Date of Acquisition	Oct. 19, 2017
The Village at Nellie Gail Ranch, CA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 22,730
Initial Cost to Company, Buildings & Improvements	22,578
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	953
Amount at Which Carried at Close of Period. Land	22,730
Amount at Which Carried at Close of Period, Buildings & Improvements	23,531
Total real estate investments	46,261
Accumulated Depreciation	$ 764
Date of Acquisition	Nov. 30, 2017
Stadium Center, WA
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 1,699
Initial Cost to Company, Buildings & Improvements	17,229
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	79
Amount at Which Carried at Close of Period. Land	1,699
Amount at Which Carried at Close of Period, Buildings & Improvements	17,308
Total real estate investments	19,007
Accumulated Depreciation	$ 391
Date of Acquisition	Feb. 23, 2018
King City Plaza, OR
Real Estate Properties [Line Items]
Initial Cost to Company, Land	$ 5,161
Initial Cost to Company, Buildings & Improvements	10,072
Cost Capitalized Subsequent to Acquisition, Buildings & Improvements	49
Amount at Which Carried at Close of Period. Land	5,161
Amount at Which Carried at Close of Period, Buildings & Improvements	10,121
Total real estate investments	15,282
Accumulated Depreciation	$ 215
Date of Acquisition	May 18, 2018
Initial [Member] | Pinole Vista Shopping Center, CA
Real Estate Properties [Line Items]
Date of Acquisition	Jan. 6, 2011
Initial [Member] | Aurora Square, WA
Real Estate Properties [Line Items]
Date of Acquisition	May 3, 2012
Subsequent Acquisition [Member] | Pinole Vista Shopping Center, CA
Real Estate Properties [Line Items]
Date of Acquisition	Aug. 27, 2018
Subsequent Acquisition [Member] | Aurora Square, WA
Real Estate Properties [Line Items]
Date of Acquisition	May 22, 2014

Schedule III - Real Estate an_4

Schedule III - Real Estate and Accumulated Depreciation (Details) - Reconciliation of Real Estate - Owned Subject to Operating Leases - 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	$ 3,109,397	$ 2,687,018	$ 2,296,617
Property improvements during the year	40,300	54,481	41,359
Properties acquired during the year	43,387	374,004	354,035
Properties sold during the year	24,427	0	0
Assets written off during the year	(8,185)	(6,106)	(4,993)
Balance	$ 3,160,472	$ 3,109,397	$ 2,687,018

Schedule III - Real Estate an_5

Schedule III - Real Estate and Accumulated Depreciation (Details) - Reconciliation of Accumulated Depreciation - 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, Accumulated Depreciation [Roll Forward]
Balance	$ 260,115	$ 193,021	$ 134,311
Depreciation expenses	81,107	72,725	63,872
Properties sold during the year	3,551	0	0
Property assets fully depreciated and written off	(8,464)	(5,631)	(5,162)
Balance	$ 329,207	$ 260,115	$ 193,021