Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 20,795	$ (19,587)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(7,236)	20,547
Interest rate swaps – net change in deferred gain or loss	(14,505)	10,114
Pension plans – net change in deferred actuarial loss	42	56
Other comprehensive (loss) income, net of tax	(21,699)	30,717
Comprehensive (loss) income	$ (904)	$ 11,130