Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 17,784	$ (6,403)	$ 15,224	$ (22,818)
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on hedges arising during the period	(1,226)	935	927	1,844
Reclassifications to net income (loss)	1,807	3,949	3,434	7,439
Income taxes on hedges	(126)	(1,708)	(941)	(3,264)
Net change in hedges, net of tax	455	3,176	3,420	6,019
Unrealized loss on note receivable arising during the period			(629)	0
Income taxes on note receivable			132	0
Unrealized loss on note receivable, net of tax			(497)	0
Foreign currency translation gain (loss)	(7,547)	6,284	(2,856)	9,392
Other comprehensive income (loss), net of tax	(7,092)	9,460	67	15,411
Comprehensive income (loss)	$ 10,692	$ 3,057	$ 15,291	$ (7,407)