Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 10,143	$ 30,006	$ 22,132	$ 58,015
Other comprehensive income (loss), net of tax:
Foreign currency translation	2	0	2	1
Total other comprehensive income (loss), net of tax	2	0	2	1
Comprehensive income (loss)	$ 10,145	$ 30,006	$ 22,134	$ 58,016