Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (22,556)	$ 42,988
Other comprehensive loss, net of taxes
Unrealized loss on interest rate swaps	(15,048)	(5,858)
Pension obligation loss	(55)	(151)
Total other comprehensive loss	(15,103)	(6,009)
Comprehensive (loss) income	$ (37,659)	$ 36,979

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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