Reclassification Out Of Accumulated Other Comprehensive Loss (Schedule Of Reclassification Out Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items]
Asset impairment charge and other													$ (1,547)	$ 2,606	$ 0
Other income (expense)													(452)	(101)	154
Selling, general and administrative expenses													115,700	99,331	89,951
Net of tax	24,011	17,156	22,150	19,125	67,489	23,726	8,457	11,487	18,115	19,314	13,580	5,598	82,442	111,159	56,607
Foreign currency translaction adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items]
Net of tax													2,930
Foreign currency translaction adjustments [Member] | Disposal Of Tianjin Subsidiary [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [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 Loss [Line Items]
Other income (expense)													(49)
Other [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items]
Net of tax													(30)
Other [Member] | Actuarial Net Gains [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items]
Selling, general and administrative expenses													$ (30)