Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 9,828	$ 15,259	$ 50,502	$ (19,897)
Other comprehensive income (loss), net of tax:
Foreign currency translation	0	2	(6)	(3)
Total other comprehensive income, net of tax	0	2	(6)	(3)
Comprehensive income (loss)	$ 9,828	$ 15,261	$ 50,496	$ (19,900)