Pension and Other Postretirement Benefits - Funded Status Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	$ (2,188)	$ (2,038)
Non-current Liabilities	(49,916)	(34,533)
Domestic [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	66,226	63,125
Service Cost	460	400	368
Interest Cost	2,803	3,145	3,385
Employee Contributions	0	0
Benefits Paid	(4,668)	(4,423)
Plan Expenses and Premiums Paid	(225)	(200)
Actuarial Loss	5,811	4,179
Translation Difference and Other	0	0
Benefit Obligation at End of Year	70,407	66,226	63,125
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	43,470	43,103
Actual Return on Plan Assets	4,466	178
Employer Contributions	2,948	4,812
Employee Contributions	0	0
Benefits Paid	(4,668)	(4,423)
Plan Expenses and Premiums Paid	(225)	(200)
Translation Difference	0	0
Fair Value of Plan Assets at End of Year	45,991	43,470	43,103
Defined Benefit Plan, Funded Status of Plan	(24,416)	(22,756)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(577)	(585)
Non-current Liabilities	(23,839)	(22,171)
Net Amount Recognized	(24,416)	(22,756)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	(460)	(542)
Accumulated Loss	(35,929)	(33,160)
Accumulated Other Comprehensive Loss	(36,389)	(33,702)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	11,973	10,946
Net Amount Recognized	(24,416)	(22,756)
Foreign [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	61,581	53,250
Service Cost	2,004	1,890	1,606
Interest Cost	3,020	3,037	2,587
Employee Contributions	101	104
Benefits Paid	(1,973)	(1,734)
Plan Expenses and Premiums Paid	(331)	(272)
Actuarial Loss	14,874	4,799
Translation Difference and Other	2,004	507
Benefit Obligation at End of Year	81,280	61,581	53,250
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	54,968	52,873
Actual Return on Plan Assets	2,972	1,984
Employer Contributions	3,842	3,504
Employee Contributions	101	104
Benefits Paid	(1,973)	(1,734)
Plan Expenses and Premiums Paid	(331)	(272)
Translation Difference	1,330	(1,491)
Fair Value of Plan Assets at End of Year	60,909	54,968	52,873
Defined Benefit Plan, Funded Status of Plan	(20,371)	(6,613)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(892)	(706)
Non-current Liabilities	(19,479)	(5,907)
Net Amount Recognized	(20,371)	(6,613)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	(62)	(90)
Accumulated Loss	(29,227)	(15,112)
Accumulated Other Comprehensive Loss	(29,289)	(15,202)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	8,918	8,589
Net Amount Recognized	(20,371)	(6,613)
Total Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	127,807	116,375
Service Cost	2,464	2,290	1,974
Interest Cost	5,823	6,182	5,972
Employee Contributions	101	104
Benefits Paid	(6,641)	(6,157)
Plan Expenses and Premiums Paid	(556)	(472)
Actuarial Loss	20,685	8,978
Translation Difference and Other	2,004	507
Benefit Obligation at End of Year	151,687	127,807	116,375
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	98,438	95,976
Actual Return on Plan Assets	7,438	2,162
Employer Contributions	6,790	8,316
Employee Contributions	101	104
Benefits Paid	(6,641)	(6,157)
Plan Expenses and Premiums Paid	(556)	(472)
Translation Difference	1,330	(1,491)
Fair Value of Plan Assets at End of Year	106,900	98,438	95,976
Defined Benefit Plan, Funded Status of Plan	(44,787)	(29,369)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(1,469)	(1,291)
Non-current Liabilities	(43,318)	(28,078)
Net Amount Recognized	(44,787)	(29,369)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	(522)	(632)
Accumulated Loss	(65,156)	(48,272)
Accumulated Other Comprehensive Loss	(65,678)	(48,904)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	20,891	19,535
Net Amount Recognized	(44,787)	(29,369)
Domestic Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	7,202	7,815
Service Cost	46	16	16
Interest Cost	283	331
Employee Contributions	0	0
Benefits Paid	(728)	(793)
Plan Expenses and Premiums Paid	0	0
Actuarial Loss	514	(167)
Translation Difference and Other	0	0
Benefit Obligation at End of Year	7,317	7,202	7,815
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	0	0
Actual Return on Plan Assets	0	0
Employer Contributions	728	793
Employee Contributions	0	0
Benefits Paid	(728)	(793)
Plan Expenses and Premiums Paid	0	0
Translation Difference	0	0
Fair Value of Plan Assets at End of Year	0	0	0
Defined Benefit Plan, Funded Status of Plan	(7,317)	(7,202)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(719)	(747)
Non-current Liabilities	(6,598)	(6,455)
Net Amount Recognized	(7,317)	(7,202)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	0	0
Accumulated Loss	(2,107)	(1,709)
Accumulated Other Comprehensive Loss	(2,107)	(1,709)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	(5,210)	(5,493)
Net Amount Recognized	$ (7,317)	$ (7,202)