Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 28,598	$ 30,052	$ (81,445)
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on hedges arising during the period	(847)	3,323	2,366
Reclassifications to net income (loss)	7,201	12,915	12,851
Income taxes on hedges	(1,338)	(5,724)	(5,347)
Net change in hedges, net of tax	5,016	10,514	9,870
Unrealized gain (loss) on note receivable arising during the period	(629)	629	0
Income taxes on note receivable	132	(220)	0
Unrealized gain (loss) on note receivable, net of tax	(497)	409	0
Foreign currency translation gain (loss) arising during the period	(7,166)	16,264	(33,899)
Reclassification adjustment for net translation gain realized upon liquidation	0	0	(2,044)
Foreign currency translation gain (loss)	(7,166)	16,264	(35,943)
Other comprehensive income (loss), net of tax	(2,647)	27,187	(26,073)
Comprehensive income (loss)	$ 25,951	$ 57,239	$ (107,518)