Income Taxes (Schedule Of Income Tax Expense/Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income (loss) before taxes: U.S.	$ (55,617)	$ (83,537)	$ (34,622)
Income (loss) before taxes: Foreign	48,404	8,793	26,073
Loss before income taxes	(7,213)	(74,744)	(8,549)
Current income taxes: U.S. federal	49	480	(12,049)
Current income taxes: U.S. state	126	195	(23)
Current income taxes: Foreign	9,494	7,488	7,620
Total current income taxes	9,669	8,163	(4,452)
Deferred income taxes: U.S. federal	263	(3,902)	400
Deferred income taxes: U.S. state	0	(118)	236
Deferred income taxes: Foreign	(651)	4,309	193
Total deferred income taxes	(388)	289	829
Total income tax expense (benefit)	$ 9,281	$ 8,452	$ (3,623)