Income Taxes (Schedule Of Income Tax Expense/Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
U.S.	$ (83,537)	$ (34,622)	$ (7,818)
Foreign	8,793	26,073	67,777
Income (loss) before income taxes	(74,744)	(8,549)	59,959
U.S. federal current	480	(12,049)	3,311
U.S. state current	195	(23)	355
Foreign current	7,488	7,620	22,337
Total current income taxes	8,163	(4,452)	26,003
U.S. federal deferred	(3,902)	400	14,968
U.S. state deferred	(118)	236	3,639
Foreign deferred	4,309	193	4,929
Total deferred income taxes	289	829	23,536
Total income tax expense (benefit)	$ 8,452	$ (3,623)	$ 49,539