Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,403)	$ (10,671)	$ (22,818)	$ (38,494)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on hedges arising during the period	935	(2,344)	1,844	1,032
Reclassification adjustments for loss on hedges included in net loss	3,949	3,054	7,439	6,494
Income taxes on unrealized (gain) loss on hedges	(1,708)	(236)	(3,264)	(2,553)
Unrealized gain on hedges, net of tax	3,176	474	6,019	4,973
Foreign currency translation gain (loss) arising during the period			9,392	(21,216)
Reclassification adjustment for translation loss realized upon liquidation			0	289
Foreign currency translation gain (loss)	6,284	(14,641)	9,392	(20,927)
Other comprehensive income (loss), net of tax	9,460	(14,167)	15,411	(15,954)
Comprehensive income (loss)	$ 3,057	$ (24,838)	$ (7,407)	$ (54,448)