CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (286,821)	$ 63,715
Net change in fair value of interest rate swaps, net of tax benefit of $4,147	(12,091)
Foreign currency translation adjustment, net of tax		1,458
Release of cumulative translation adjustment to loss from discontinued operations due to substantial liquidation of foreign entity		3,044
Total other comprehensive income (loss), net of tax	(12,091)	4,502
Comprehensive income (loss)	$ (298,912)	$ 68,217