Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenue	$ 136,837		$ 144,151		$ 281,925	$ 288,047
Operating expenses	(110,568)		(117,288)		(228,077)	(235,976)
Interest expense	(20,191)		(20,516)		(40,200)	(40,873)
Depreciation and amortization	(49,743)		(51,667)		(101,781)	(103,111)
Net income	4,020	$ 8,087	6,252	$ 4,583	12,107	10,835
Equity in loss of Real Estate Ventures	(2,203)		(1,491)		(4,094)	(2,849)
Other
Schedule of Equity Method Investments [Line Items]
Revenue	15,013		15,567		28,851	32,338
Operating expenses	(5,990)		(5,757)		(11,724)	(12,320)
Interest expense	(3,324)		(3,788)		(6,266)	(5,172)
Depreciation and amortization	(6,870)		(6,922)		(13,335)	(14,285)
Net income	(1,171)		(900)		(2,474)	561
Company's share of net loss	(553)		(59)		(909)	5
Basis adjustments and other	(12)		2		(26)	12
Equity in loss of Real Estate Ventures	(565)		(57)		(935)	17
MAP Venture
Schedule of Equity Method Investments [Line Items]
Revenue	16,281		17,796		33,594	36,084
Operating expenses	(12,016)		(11,611)		(24,243)	(23,766)
Interest expense	(1,831)		(2,532)		(3,879)	(5,068)
Depreciation and amortization	(5,756)		(6,550)		(11,814)	(12,899)
Net income	$ (3,322)		$ (2,897)		$ (6,342)	$ (5,649)
Ownership interest %	50.00%		50.00%		50.00%	50.00%
Company's share of net loss	$ (1,661)		$ (1,449)		$ (3,171)	$ (2,825)
Basis adjustments and other	23		15		12	(41)
Equity in loss of Real Estate Ventures	(1,638)		(1,434)		(3,159)	(2,866)
Total
Schedule of Equity Method Investments [Line Items]
Revenue	31,294		33,363		62,445	68,422
Operating expenses	(18,006)		(17,368)		(35,967)	(36,086)
Interest expense	(5,155)		(6,320)		(10,145)	(10,240)
Depreciation and amortization	(12,626)		(13,472)		(25,149)	(27,184)
Net income	(4,493)		(3,797)		(8,816)	(5,088)
Company's share of net loss	(2,214)		(1,508)		(4,080)	(2,820)
Basis adjustments and other	11		17		(14)	(29)
Equity in loss of Real Estate Ventures	$ (2,203)		$ (1,491)		$ (4,094)	$ (2,849)