Condensed Consolidated Statements of Comprehensive Income (Unaudited) Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other comprehensive (loss)/income
Adoption of new accounting standards	$ 0	$ 408
Market value adjustments on interest rate swaps, net of tax	(12,206)	4,137
Foreign currency translation adjustments	5,342	(4,114)
Supplemental benefit plans adjustments, net of tax	(149)	(124)
Total other comprehensive (loss)/income	(7,013)	307
Net income	1,687	28,287
Comprehensive (loss)/income	$ (5,326)	$ 28,594