Pension and Other Postretirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.00%	5.40%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.60%	5.00%
Defined Benefit Plan, Benefit Obligation	$ 46,876	$ 34,304	$ 30,888
Defined Benefit Plan, Service Cost	1,127	1,352
Defined Benefit Plan, Interest Cost	1,684	1,743
Defined Benefit Plan, Benefits Paid	(910)	(676)
defined benefit plan, Administrative Expenses	(181)	(185)
Defined Benefit Plan, Actuarial Net (Gains) Losses	10,009	2,021
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	843	(839)
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	3.40%	5.40%
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	708	(647)
Defined Benefit Plan, Fair Value of Plan Assets	38,093	34,590	26,022
Defined Benefit Plan, Actual Return on Plan Assets	2,267	8,157
Defined Benefit Plan, Contributions by Employer	1,619	1,919
Defined Benefit Plan, Funded Status of Plan	(8,783)	286
Defined Benefit Plan, Accumulated Benefit Obligation	$ 39,276	$ 28,998