Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (78,604)	$ (30,461)	$ (188,618)	$ 13,567
Other comprehensive income (loss), net of taxes
Unrealized gain (loss) on interest rate swaps	2,958	(4,588)	(9,164)	(25,230)
Pension obligation gain (loss)	100	(6)	197	(182)
Total other comprehensive income (loss)	3,058	(4,594)	(8,967)	(25,412)
Comprehensive loss	$ (75,546)	$ (35,055)	$ (197,585)	$ (11,845)