CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)		$ 44,261	$ (25,403)	$ 10,398	$ 114,408
Other comprehensive income (loss):
Change in value of interest rate swaps		3,392	738	23,738	729
Pro rata share of other comprehensive (loss) income of unconsolidated joint ventures	[1]	(262)	226	(105)	39
Comprehensive income (loss)		47,391	(24,439)	34,031	115,176
Less comprehensive (income) loss attributable to noncontrolling interests in:
Consolidated joint ventures		(2,713)	14,217	(5,520)	11,029
Consolidated real estate fund		(30)	(114)	(612)	(20,195)
Operating Partnership		(4,233)	993	(2,622)	(12,194)
Comprehensive income (loss) attributable to common stockholders		$ 40,415	$ (9,343)	$ 25,277	$ 93,816

[1] Represents foreign currency translation adjustments. No amounts were reclassified from accumulated other comprehensive income during any of the periods set forth above.