Income Taxes (Schedule Of Federal Statutory Income Tax Rate To Income Before Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Tax at statutory rate	$ 23,866	$ 31,514	$ 34,520
State taxes, net of federal tax effect	1,102	1,295	1,615
Effect of foreign operations and tax incentives	(15,496)	(21,820)	(24,330)
Change in valuation allowance	(1,152)	(19,640)	(118)
Chinese retroactive tax incentive	0	0	(1,227)
Losses in foreign jurisdictions for which no benefit has been provided	2,106	3,711	5,812
Change in uncertain tax benefits reserve	(8,270)	(1,653)	0
Other	1,985	1,231	1,116
Total income tax expense (benefit)	$ 4,141	$ (5,362)	$ 17,388