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, 2013	Dec. 31, 2012	Dec. 31, 2011
Domestic [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	$ 299	$ 460	$ 400
Interest Cost	2,437	2,803	3,145
Expected Return on Plan Assets	(3,664)	(3,481)	(3,592)
Actuarial Loss Amortization	2,481	2,057	1,554
Prior Service Cost Amortization	148	82	82
Net Periodic Benefit Cost	1,701	1,921	1,589
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (Gain) Loss Arising During The Period	(5,856)	4,826	7,593
Effect of Plan Amendment	0	0
Prior Service Cost Amortization	(148)	(82)	(82)
Actuarial Loss Amortization	(2,481)	(2,057)	(1,554)
Foreign Currency Exchange Rate Changes	0	0	0
Total Recognized in Other Comprehensive (Income) Loss	(8,485)	2,687	5,957
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	(6,784)	4,608	7,546
Foreign [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	2,864	2,004	1,890
Interest Cost	3,150	3,020	3,037
Expected Return on Plan Assets	(2,245)	(1,995)	(2,349)
Actuarial Loss Amortization	1,486	590	233
Prior Service Cost Amortization	30	30	32
Net Periodic Benefit Cost	5,285	3,649	2,843
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (Gain) Loss Arising During The Period	(1,558)	13,897	5,164
Effect of Plan Amendment	(2,138)	0
Prior Service Cost Amortization	(30)	(30)	(32)
Actuarial Loss Amortization	(1,486)	(590)	(233)
Foreign Currency Exchange Rate Changes	1,007	809	(794)
Total Recognized in Other Comprehensive (Income) Loss	(4,205)	14,086	4,105
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	1,080	17,735	6,948
Total Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	3,163	2,464	2,290
Interest Cost	5,587	5,823	6,182
Expected Return on Plan Assets	(5,909)	(5,476)	(5,941)
Actuarial Loss Amortization	3,967	2,647	1,787
Prior Service Cost Amortization	178	112	114
Net Periodic Benefit Cost	6,986	5,570	4,432
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (Gain) Loss Arising During The Period	(7,414)	18,723	12,757
Effect of Plan Amendment	(2,138)	0
Prior Service Cost Amortization	(178)	(112)	(114)
Actuarial Loss Amortization	(3,967)	(2,647)	(1,787)
Foreign Currency Exchange Rate Changes	1,007	809	(794)
Total Recognized in Other Comprehensive (Income) Loss	(12,690)	16,773	10,062
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	(5,704)	22,343	14,494
Domestic Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	34	46	16
Interest Cost	185	283	331
Actuarial Loss Amortization	32	115	75
Net Periodic Benefit Cost	251	444	422
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (Gain) Loss Arising During The Period	(1,331)	514	(167)
Actuarial Loss Amortization	(32)	(115)	(75)
Total Recognized in Other Comprehensive (Income) Loss	(1,363)	399	(242)
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	$ (1,112)	$ 843	$ 180