Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 33,819	$ 1,687
Other comprehensive loss
Market value adjustments on interest rate swaps, net of tax	(36,890)	(12,206)
Foreign currency translation adjustments	(38,690)	5,342
Supplemental benefit plans adjustments, net of tax	187	(149)
Total other comprehensive loss	(75,393)	(7,013)
Comprehensive loss	$ (41,574)	$ (5,326)