Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,583	$ 19,598	$ 26,596	$ 75,538
Other comprehensive income (loss), net of tax:
Foreign currency translation	(2)	4	0	5
Total other comprehensive income (loss), net of tax	(2)	4	0	5
Comprehensive income (loss)	6,581	19,602	26,596	75,543
Net Income (Loss) Attributable to Noncontrolling Interest	2,770	4,110	7,188	37,798
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 3,811	$ 15,492	$ 19,408	$ 37,745