Other Employee Benefit Plans Other Employee Benefit Plans (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in benefit obligation:
Benefit obligation at January 1	$ 23,979	$ 20,564
Service costs	267	205	142
Interest costs	936	1,047	1,135
Actuarial loss (gain)	(158)	2,697
Benefits paid	(417)	(436)
Foreign currency exchange changes	325	(98)
Benefit obligation at December 31	24,932	23,979	20,564
Fair value of plan assets at December 31	0	0
Unfunded status at December 31	24,932	23,979
Amounts recognized in the Consolidated Balance Sheets:
Current liabilities	409	401
Non-current liabilities	$ 24,523	$ 23,578
Supplemental Executive Retirement Plan (SERP)
Net periodic benefit cost:
Discount rate	4.00%	5.15%
Rate of increase in compensation levels	5.00%	5.00%
Funded status and projected benefit obligation:
Discount rate	3.75%	4.00%
Rate of increase in compensation levels	3.00%	5.00%
Defined benefit pension plan for employees outside the United States
Net periodic benefit cost:
Discount rate	2.75%	3.40%
Funded status and projected benefit obligation:
Discount rate	2.75%	3.40%

The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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