Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (2,911)	$ 46,889
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax benefit (expense) of ($170) in 2017 and $200 in 2016	13,416	9,866
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of ($211) in 2017 and $4,274 in 2016	356	(7,185)
Comprehensive income	$ 10,861	$ 49,570