Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Schedule of Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Combined and Condensed Statements of Income
Revenues	$ 74,800	$ 63,124
Operating and other expenses	(60,606)	(56,423)
Depreciation and amortization	(30,333)	(28,576)
Income (loss) from continuing operations before gain on disposition of properties	922	(4,160)
Company’s equity in earnings of unconsolidated affiliates	2,271	1,684
Unconsolidated Affiliates
Combined and Condensed Statements of Income
Revenues	19,973	20,156
Operating and other expenses	(5,106)	(5,921)
Interest expense	(4,776)	(4,874)
Depreciation and amortization	(4,792)	(6,055)
Loss on disposition of properties		(418)
Income (loss) from continuing operations before gain on disposition of properties	5,299	2,888
Operating Partnership, as General Partner or Managing Member
Combined and Condensed Statements of Income
Company’s share of equity in net income of unconsolidated affiliates	2,995	2,267
Basis differential amortization	(724)	(583)
Company’s equity in earnings of unconsolidated affiliates	$ 2,271	$ 1,684