Reclassification Out Of Accumulated Other Comprehensive Loss (Schedule Of Reclassification Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Asset impairment charge and other													$ 0	$ (1,547)	$ 2,606
Other expense													(1,141)	(1,673)	(315)
Selling, general and administrative expenses													(111,744)	(115,700)	(99,331)
Net of tax	$ 39,421	$ 20,565	$ 21,210	$ 14,205	$ 23,338	$ 16,906	$ 21,558	$ 19,439	$ 67,710	$ 23,648	$ 8,256	$ 11,331	95,401	81,241	$ 110,945
Foreign currency translaction adjustments [Member] | Reclassification Out Of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of tax														2,930
Foreign currency translaction adjustments [Member] | Disposal Of Tianjin Subsidiary [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Asset impairment charge and other														2,979
Foreign currency translaction adjustments [Member] | Foreign Currency Translations [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other expense														(49)
Other [Member] | Reclassification Out Of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of tax														(30)
Other [Member] | Actuarial Net Gains [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses													(13)	$ (30)
Net of tax													$ (13)