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Employee Retirement Plans (Details 4) (Pension benefits, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee retirement plans
Total pension plan assets	$ 21,808	$ 18,637	$ 17,804
Significant Other Observable Inputs (Level 2)
Employee retirement plans
Total pension plan assets	20,691	17,541
Significant Unobservable Inputs (Level 3)
Employee retirement plans
Total pension plan assets	1,117	1,096	718
Equity holdings
Employee retirement plans
Total pension plan assets	12,672	10,575
Equity holdings \| Significant Other Observable Inputs (Level 2)
Employee retirement plans
Total pension plan assets	12,672	10,575
Fixed-income holdings
Employee retirement plans
Total pension plan assets	8,019	6,966
Fixed-income holdings \| Significant Other Observable Inputs (Level 2)
Employee retirement plans
Total pension plan assets	8,019	6,966
Alternative investments
Employee retirement plans
Total pension plan assets	1,117	1,096
Alternative investments \| Significant Unobservable Inputs (Level 3)
Employee retirement plans
Total pension plan assets	$ 1,117	$ 1,096

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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