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Stock-Based Compensation (Summary of Non-Vested Restricted Stock Activity) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Stock-based Compensation Arrangements, Restricted Stock, Nonvested [Roll Forward] | |||
| Shares Outstanding, Beginning of Period | 523,967 | 790,484 | 954,029 |
| Shares, Granted | 163,417 | 92,689 | 293,120 |
| Shares, Vested | 160,738 | 327,707 | 419,704 |
| Shares, Forfeited | 32,184 | 31,499 | 36,961 |
| Shares Outstanding, End of Period | 494,462 | 523,967 | 790,484 |
| Weighted Average Grant-Date Fair Value, Outstanding at Beginning of Period | $ 11.94 | $ 9.96 | $ 7.9 |
| Weighted Average Grant-Date Fair Value, Granted | $ 20.29 | $ 14.69 | $ 11.13 |
| Weighted Average Grant-Date Fair Value, Vested | $ 11.05 | $ 8.08 | $ 5.93 |
| Weighted Average Grant-Date Fair Value, Forfeited | $ 16.83 | $ 10.49 | $ 11.81 |
| Weighted Average Grant-Date Fair Value, Outstanding at End of Period | $ 14.67 | $ 11.94 | $ 9.96 |