Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 11,462	$ 9,880	$ (27,032)	$ 26,887
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on hedges arising during the period	4,418	(14,779)	5,450	(23,144)
Reclassification adjustments for loss on hedges included in net income (loss)	3,157	4,255	9,651	9,186
Income taxes on unrealized (gain) loss on hedges	(2,683)	3,772	(5,236)	4,974
Unrealized gain (loss) on hedges, net of tax	4,892	(6,752)	9,865	(8,984)
Foreign currency translation loss arising during the period			(24,827)	(8,363)
Reclassification adjustment for translation loss realized upon liquidation			289	0
Foreign currency translation loss	(3,611)	(10,383)	(24,538)	(8,363)
Other comprehensive income (loss), net of tax	1,281	(17,135)	(14,673)	(17,347)
Comprehensive income (loss)	$ 12,743	$ (7,255)	$ (41,705)	$ 9,540