CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 8,357	$ 28,511	$ 27,493	$ (169,595)
Net change in fair value of effective portion of interest rate swaps designated as cash flow hedges, net of tax (expense) benefit of ($451), $393, ($1,334), and $7,195, respectively	1,317	(1,145)	3,892	(20,974)
Reclassification adjustment for previously deferred loss from interest rate swaps included in "Interest expense," net of tax of $37, $0, $115, and $0, respectively	108		335
Total other comprehensive income (loss), net of tax	1,425	(1,145)	4,227	(20,974)
Comprehensive income (loss)	$ 9,782	$ 27,366	$ 31,720	$ (190,569)