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Employee Retirement Plans (Details 4) (Pension benefits, USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|
| Employee retirement plans | |||
| Total pension plan assets | $ 24,638 | $ 21,808 | $ 18,637 |
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Significant Other Observable Inputs (Level 2)
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| Employee retirement plans | |||
| Total pension plan assets | 23,412 | 20,691 | |
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Significant Unobservable Inputs (Level 3)
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| Employee retirement plans | |||
| Total pension plan assets | 1,226 | 1,117 | 1,096 |
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Equity holdings
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| Employee retirement plans | |||
| Total pension plan assets | 13,582 | 12,672 | |
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Equity holdings | Significant Other Observable Inputs (Level 2)
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| Employee retirement plans | |||
| Total pension plan assets | 13,582 | 12,672 | |
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Fixed-income holdings
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| Employee retirement plans | |||
| Total pension plan assets | 9,830 | 8,019 | |
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Fixed-income holdings | Significant Other Observable Inputs (Level 2)
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| Employee retirement plans | |||
| Total pension plan assets | 9,830 | 8,019 | |
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Alternative investments
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| Employee retirement plans | |||
| Total pension plan assets | 1,226 | 1,117 | |
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Alternative investments | Significant Unobservable Inputs (Level 3)
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| Employee retirement plans | |||
| Total pension plan assets | $ 1,226 | $ 1,117 |