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Employee Benefit Plans (Investment Strategies) (Details)
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12 Months Ended |
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Dec. 31, 2013
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Small-Cap Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Small-cap fund |
| Fund's Investment Strategy | Seeks to track performance of the Center for Research in Security Prices ("CRSP") US Small Cap Index |
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Mid-Cap Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Mid-cap fund |
| Fund's Investment Strategy | Seeks to track performance of the CRSP US Mid Cap Index |
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Large-Cap Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Large-cap fund |
| Fund's Investment Strategy | Seeks to track performance of the Standard & Poor’s 500 Index |
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International Equity Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | International equity fund |
| Fund's Investment Strategy | Seeks long-term growth of capital by investing 65% or more of assets in international equities |
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Short-Term Bond Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Short-term bond funds |
| Fund's Investment Strategy | Seek current income with limited price volatility through investment in primarily high quality bonds |
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Intermediate-Term Bond Funds [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Intermediate-term bond funds |
| Fund's Investment Strategy | Seek moderate and sustainable level of current income by investing primarily in high quality fixed income securities with maturities from five to ten years |
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Long-Term Investment Grade Bond Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Long-term investment grade bond funds |
| Fund's Investment Strategy | Seek high and sustainable current income through investment primarily in long-term high grade bonds |
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Short-Term Investment Fund [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Short-term investment funds |
| Fund's Investment Strategy | Invest primarily in high quality commercial paper and government securities |
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Group Annuity Contract [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Asset Category | Group annuity contract |
| Fund's Investment Strategy | Guarantees a specified return based on a specified index |