Pension and Other Postretirement Benefits - Funded Status Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	$ (1,438)	$ (2,188)
Non-current Liabilities	(37,006)	(49,916)
Domestic [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	70,407	66,226
Service Cost	299	460	400
Interest Cost	2,437	2,803	3,145
Employee Contributions	0	0
Effect of Plan Amendments	0	0
Benefits Paid	(4,516)	(4,668)
Plan Expenses and Premiums Paid	(225)	(225)
Actuarial Loss	(2,033)	5,811
Translation Difference and Other	0	0
Benefit Obligation at End of Year	66,369	70,407	66,226
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	45,991	43,470
Actual Return on Plan Assets	7,487	4,466
Employer Contributions	1,913	2,948
Employee Contributions	0	0
Benefits Paid	(4,516)	(4,668)
Plan Expenses and Premiums Paid	(225)	(225)
Translation Difference	0	0
Fair Value of Plan Assets at End of Year	50,650	45,991	43,470
Defined Benefit Plan, Funded Status of Plan	(15,719)	(24,416)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(589)	(577)
Non-current Liabilities	(15,130)	(23,839)
Net Amount Recognized	(15,719)	(24,416)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	(311)	(460)
Accumulated Loss	(27,593)	(35,929)
Accumulated Other Comprehensive Loss	(27,904)	(36,389)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	12,185	11,973
Net Amount Recognized	(15,719)	(24,416)
Foreign [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	81,280	61,581
Service Cost	2,864	2,004	1,890
Interest Cost	3,150	3,020	3,037
Employee Contributions	111	101
Effect of Plan Amendments	(2,138)	0
Benefits Paid	(1,853)	(1,973)
Plan Expenses and Premiums Paid	(367)	(331)
Actuarial Loss	(566)	14,874
Translation Difference and Other	3,264	2,004
Benefit Obligation at End of Year	85,745	81,280	61,581
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	60,909	54,968
Actual Return on Plan Assets	3,237	2,972
Employer Contributions	3,947	3,842
Employee Contributions	111	101
Benefits Paid	(1,853)	(1,973)
Plan Expenses and Premiums Paid	(367)	(331)
Translation Difference	2,675	1,330
Fair Value of Plan Assets at End of Year	68,659	60,909	54,968
Defined Benefit Plan, Funded Status of Plan	(17,086)	(20,371)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(242)	(892)
Non-current Liabilities	(16,844)	(19,479)
Net Amount Recognized	(17,086)	(20,371)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	2,105	(62)
Accumulated Loss	(27,188)	(29,227)
Accumulated Other Comprehensive Loss	(25,083)	(29,289)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	7,997	8,918
Net Amount Recognized	(17,086)	(20,371)
Total Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	151,687	127,807
Service Cost	3,163	2,464	2,290
Interest Cost	5,587	5,823	6,182
Employee Contributions	111	101
Effect of Plan Amendments	(2,138)	0
Benefits Paid	(6,369)	(6,641)
Plan Expenses and Premiums Paid	(592)	(556)
Actuarial Loss	(2,599)	20,685
Translation Difference and Other	3,264	2,004
Benefit Obligation at End of Year	152,114	151,687	127,807
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	106,900	98,438
Actual Return on Plan Assets	10,724	7,438
Employer Contributions	5,860	6,790
Employee Contributions	111	101
Benefits Paid	(6,369)	(6,641)
Plan Expenses and Premiums Paid	(592)	(556)
Translation Difference	2,675	1,330
Fair Value of Plan Assets at End of Year	119,309	106,900	98,438
Defined Benefit Plan, Funded Status of Plan	(32,805)	(44,787)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(831)	(1,469)
Non-current Liabilities	(31,974)	(43,318)
Net Amount Recognized	(32,805)	(44,787)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	1,794	(522)
Accumulated Loss	(54,781)	(65,156)
Accumulated Other Comprehensive Loss	(52,987)	(65,678)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	20,182	20,891
Net Amount Recognized	(32,805)	(44,787)
Domestic Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	7,317	7,202
Service Cost	34	46	16
Interest Cost	185	283	331
Employee Contributions	0	0
Effect of Plan Amendments	0	0
Benefits Paid	(566)	(728)
Plan Expenses and Premiums Paid	0	0
Actuarial Loss	(1,331)	514
Translation Difference and Other	0	0
Benefit Obligation at End of Year	5,639	7,317	7,202
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	566	728
Employee Contributions	0	0
Benefits Paid	(566)	(728)
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	(5,639)	(7,317)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Liabilities	(607)	(719)
Non-current Liabilities	(5,032)	(6,598)
Net Amount Recognized	(5,639)	(7,317)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Service Cost	0	0
Accumulated Loss	(745)	(2,107)
Accumulated Other Comprehensive Loss	(745)	(2,107)
Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost	(4,894)	(5,210)
Net Amount Recognized	$ (5,639)	$ (7,317)