Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) attributable to common stockholders	$ 91,687	$ (28,246)	$ (70,852)
Other comprehensive income (loss):
Unrealized gain (loss) on derivatives, net of income taxes	335	(2,442)
Less: Interest expense on derivatives recognized into earnings, net of income taxes	(1,023)	(1,521)
Comprehensive income (loss)	$ 93,045	$ (29,167)	$ (70,852)