Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 24,826	$ (16,462)	$ 51,533	$ (42,895)
Other comprehensive income (loss):
Change in fair value of interest rate hedges	(248)	221	(430)	(975)
Realized (gains) losses on interest rate hedges reclassified to earnings	3,831	6,966	13,196	21,746
Total other comprehensive income	3,583	7,187	12,766	20,771
Comprehensive income (loss) before allocation to noncontrolling interests	28,409	(9,275)	64,299	(22,124)
Allocation to noncontrolling interests	(23,055)	603	(21,823)	20
Comprehensive income (loss)	$ 5,354	$ (8,672)	$ 42,476	$ (22,104)