Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 27,121	$ 2,290	$ 42,345	$ (20,528)
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on hedges arising during the period	(88)	2,297	839	4,141
Reclassifications to net income (loss)	1,799	3,383	5,233	10,822
Income taxes on hedges	(357)	(1,992)	(1,298)	(5,256)
Net change in hedges, net of tax	1,354	3,688	4,774	9,707
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)	(1,421)	5,513	(4,277)	14,905
Other comprehensive income (loss), net of tax	(67)	9,201	0	24,612
Comprehensive income	$ 27,054	$ 11,491	$ 42,345	$ 4,084