Pension and Other Postretirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.70%	3.60%
Defined Benefit Plan, Benefit Obligation	$ 49,456	$ 46,876	$ 34,304
Defined Benefit Plan, Service Cost	1,582	1,127
Defined Benefit Plan, Interest Cost	1,676	1,684
Defined Benefit Plan, Plan Amendments	(583)	0
Defined Benefit Plan, Benefits Paid	(1,078)	(910)
defined benefit plan, Administrative Expenses	(199)	(181)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(843)	10,009
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	2,025	843
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.00%	3.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	3.30%	3.40%
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	1,621	708
Defined Benefit Plan, Fair Value of Plan Assets	39,504	38,093	34,590
Defined Benefit Plan, Actual Return on Plan Assets	(961)	2,267
Defined Benefit Plan, Contributions by Employer	2,028	1,619
Defined Benefit Plan, Funded Status of Plan	(9,952)	(8,783)
Defined Benefit Plan, Accumulated Benefit Obligation	$ 42,871	$ 39,276