Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Schedule of Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Combined and Condensed Balance Sheets
Other assets	$ 202,206	$ 208,570
Total assets	4,038,875	3,958,780	$ 3,938,976
Total liabilities and equity	4,038,875	3,958,780
Company's share of distributions in excess of income from and investments in unconsolidated affiliates	15,415	15,623
Investments in and advances to unconsolidated affiliates	309,349	262,410
Unconsolidated Affiliates
Combined and Condensed Balance Sheets
Rental property, net	571,205	488,000
Investment in unconsolidated affiliates	6,853	6,853
Other assets	68,921	91,497
Total assets	646,979	586,350
Mortgage notes payable	444,642	408,967
Other liabilities	59,303	54,675
Partners’ equity	143,034	122,708
Total liabilities and equity	646,979	586,350
Company's share of accumulated equity	189,463	141,384
Basis differential	103,360	104,084
Deferred fees, net of portion related to the Company's interest	1,812	1,780
Amounts payable by the Company	(701)	(461)
Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates	293,934	246,787
Company's share of distributions in excess of income from and investments in unconsolidated affiliates	15,415	15,623
Investments in and advances to unconsolidated affiliates	$ 309,349	$ 262,410