Investments in and Advances to Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Combined and Condensed Balance Sheets
Real estate under development, at cost	$ 510,548		$ 543,486
Investments in and advances to unconsolidated affiliates	260,497		272,028
Other assets	201,822		192,786
Total assets	4,014,902		3,995,960
Total liabilities and equity	4,014,902		3,995,960
Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates	245,276		258,337
Combined and Condensed Statements of Operations [Abstract]
Total revenues	61,999	$ 48,045
Operating and other expenses	(52,102)	(38,194)
Depreciation and amortization	(24,536)	(16,849)
Income from continuing operations before gain on disposition of properties	19,971	8,482
Company’s equity in earnings of unconsolidated affiliates	12,703	1,954
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Related party revenue	400	100
Expenses, related party	500	$ 600
Unconsolidated Affiliates [Member]
Combined and Condensed Balance Sheets
Rental property, net	549,632		576,505
Real estate under development, at cost	16,837		18,884
Investments in and advances to unconsolidated affiliates	6,853		6,853
Other assets	101,144		75,254
Total assets	674,466		677,496
Mortgage notes payable	389,198		407,344
Other liabilities	58,909		30,117
Partners’ equity	226,359		240,035
Total liabilities and equity	674,466		677,496
Company's share of accumulated equity	177,805		191,049
Basis differential	60,520		61,827
Deferred fees, net of portion related to the Company's interest	4,678		3,268
Amounts receivable by the Company	2,273		2,193
Combined and Condensed Statements of Operations [Abstract]
Total revenues	21,603		13,372
Operating and other expenses	(5,866)		(3,730)
Interest expense	(4,538)		(2,736)
Depreciation and amortization	(6,449)		(3,880)
Loss on debt extinguishment	(151)		0
Gain on disposition of properties	14,446		0
Income from continuing operations before gain on disposition of properties	19,045		3,026
Operating Partnership, as General Partner or Managing Member [Member]
Combined and Condensed Statements of Operations [Abstract]
Company’s share of equity in net income of unconsolidated affiliates	13,569		2,052
Basis differential amortization	(866)		(98)
Company’s equity in earnings of unconsolidated affiliates	$ 12,703		$ 1,954