CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - 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) attributable to common stockholders	$ (2,768)	$ (15,214)	$ (13,223)	$ (44,166)
Other comprehensive income:
Unrealized loss on derivatives, net of tax benefit of $904 and $0 for the three months and nine months ended September 30, 2015	(4,690)		(3,621)
Less interest expense on derivatives recognized into earnings	(570)		(926)
Comprehensive loss	$ (6,888)	$ (15,214)	$ (15,918)	$ (44,166)