Pension and Other Postretirement Benefits - Net Periodic Benefit Cost and Changes in Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Domestic [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	$ 460	$ 400	$ 368
Interest Cost	2,803	3,145	3,385
Expected Return on Plan Assets	(3,481)	(3,592)	(3,307)
Settlement Charge	0	0	(1,317)
Curtailment Charge	0	0	(19)
Other, Amortization, Net	2,139	1,636	1,516
Net Periodic Benefit Cost	1,921	1,589	3,298
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss Arising During The Period	4,826	7,593	3,204
Transition Asset Amortization	0	0	0
Prior Service Cost Amortization	(82)	(82)	(104)
Actuarial Loss Amortization	(2,057)	(1,554)	(2,747)
Foreign Currency Exchange Rate Changes	0	0	0
Total Recognized in Other Comprehensive Income (Loss)	2,687	5,957	353
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or Income	4,608	7,546	3,651
Foreign [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	2,004	1,890	1,606
Interest Cost	3,020	3,037	2,587
Expected Return on Plan Assets	(1,995)	(2,349)	(2,135)
Settlement Charge	0	0	0
Curtailment Charge	0	0	0
Other, Amortization, Net	620	265	36
Net Periodic Benefit Cost	3,649	2,843	2,094
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss Arising During The Period	13,897	5,164	4,100
Transition Asset Amortization	0	0	4
Prior Service Cost Amortization	(30)	(32)	(30)
Actuarial Loss Amortization	(590)	(234)	(10)
Foreign Currency Exchange Rate Changes	809	(793)	(259)
Total Recognized in Other Comprehensive Income (Loss)	14,086	4,105	3,805
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or Income	17,735	6,948	5,899
Total Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	2,464	2,290	1,974
Interest Cost	5,823	6,182	5,972
Expected Return on Plan Assets	(5,476)	(5,941)	(5,442)
Settlement Charge	0	0	(1,317)
Curtailment Charge	0	0	(19)
Other, Amortization, Net	2,759	1,901	1,552
Net Periodic Benefit Cost	5,570	4,432	5,392
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss Arising During The Period	18,723	12,757	7,304
Transition Asset Amortization	0	0	4
Prior Service Cost Amortization	(112)	(114)	(134)
Actuarial Loss Amortization	(2,647)	(1,788)	(2,757)
Foreign Currency Exchange Rate Changes	809	(793)	(259)
Total Recognized in Other Comprehensive Income (Loss)	16,773	10,062	4,158
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or Income	$ 22,343	$ 14,494	$ 9,550