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Debt and Letters of Credit (Tables)
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12 Months Ended |
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Dec. 31, 2014
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| Debt and Letters of Credit [Abstract] |
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| Schedule of total liabilities to tangible net worth ratio |
| Total Liabilities to Tangible Net Worth | | | Applicable LIBOR Margin | | | | | | | | | 1.00 or greater | | | 1.25 | % | | 0.65 or greater, but less than 1.00 | | | 1.00 | % | | Less than 0.65 | | | 0.75 | % |
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| Schedule of line of credit depending on leverage ratio |
| Leverage Ratio | | | Applicable Unused Commitment Fee (per annum) | | | | | | | | | 1.00 or greater | | | 0.35 | % | | 0.65 or greater, but less than 1.00 | | | 0.25 | % | | Less than 0.65 | | | 0.15 | % |
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