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Employee Benefit Plans (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 14,933us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 13,532us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 11,707us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 13,886us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,047us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,937us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,937us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Cash equivalents | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Cash equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 7,252us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. large-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 7,252us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. large-cap | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. large-cap | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. mid-cap      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. mid-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 921us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. mid-cap | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. mid-cap | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. small-cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,131us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. small-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 1,131us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. small-cap | Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. small-cap | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
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International      
Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Real estate      
Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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[1] This category is comprised of low-cost equity index funds not actively managed that track the S&P 500.
[2] This category is comprised of low-cost equity index funds not actively managed that track the MSCI U.S. mid-cap 450.
[3] This category is comprised of actively managed mutual funds.
[4] At December 31, 2014 and 2013, 31% and 32%, respectively, of this category is comprised of low-cost equity index funds not actively managed that track the MSCI EAFE.
[5] This category is comprised of low-cost real estate index exchange traded funds.
[6] This category is comprised of exchange traded funds investing in agricultural and energy commodities.
[7] This category is comprised of individual bonds.