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Stock-Based Compensation (Deferred Stock Units) (Details) (Deferred Stock Units [Member])
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3 Months Ended |
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Mar. 31, 2015
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Deferred Stock Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] | |
| Non-vested awards outstanding at beginning balance (shares) | 30,150 |
| Awards granted (shares) | 0 |
| Stock issued (shares) | 0 |
| Non-vested awards outstanding ending balance (shares) | 30,150 |