Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 55,714	$ (2,911)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	10,978	13,416
Unrealized gain on derivative instruments	4,529	356
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	85	0
Comprehensive income	$ 71,306	$ 10,861