Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (87,458)	$ 1,040	$ (110,014)	$ 44,028
Other comprehensive income (loss), net of taxes
Unrealized gain (loss) on interest rate swaps	2,926	(14,784)	(12,122)	(20,642)
Pension obligation gain (loss)	152	(25)	97	(176)
Total other comprehensive income (loss)	3,078	(14,809)	(12,025)	(20,818)
Comprehensive (loss) income	$ (84,380)	$ (13,769)	$ (122,039)	$ 23,210