CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4,469	$ 9,357	$ 4,892	$ 1,078
Other comprehensive income (loss):
Change in value of interest rate swaps	7,802	(18,602)	(33,812)	(18,602)
Pro rata share of other comprehensive (loss) income of unconsolidated joint ventures	(82)	78	(19)	(535)
Comprehensive income (loss)	12,189	(9,167)	(28,939)	(18,059)
Less comprehensive (income) loss attributable to noncontrolling interests in:
Consolidated real estate funds	67	(7,936)	819	(16,677)
Consolidated joint ventures	(4,703)	(33)	(10,062)	(964)
Operating Partnership	(1,286)	3,356	7,488	6,987
Comprehensive income (loss) attributable to common stockholders	$ 6,267	$ (13,780)	$ (30,694)	$ (28,713)