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Stock-Based Compensation (Tables)
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12 Months Ended |
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Dec. 31, 2013
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| Stock-Based Compensation [Abstract] |
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| Schedule of Stock-based Compensation, Stock Options Activity [Table Text Block] |
| | | Weighted | | | | | Average | | | Number of | | Exercise Price | | Options | Shares | | Per Share | | | | | | | Outstanding, December 31, 2010 | 648,153 | | $ | 9.99 | | Granted | — | | | — | | Exercised | (169,611) | | | 7.27 | | Forfeited | (3,325) | | | 13.72 | | Expired | — | | | — | | Outstanding, December 31, 2011 | 475,217 | | $ | 10.93 | | Granted | — | | | — | | Exercised | (89,900) | | | 9.47 | | Forfeited | (17,154) | | | 10.33 | | Expired | (4,644) | | | 19.78 | | Outstanding, December 31, 2012 | 363,519 | | $ | 11.21 | | Granted | — | | | — | | Exercised | (127,957) | | | 11.91 | | Forfeited | (4,229) | | | 10.38 | | Expired | (12,416) | | | 18.48 | | Outstanding, December 31, 2013 | 218,917 | | $ | 10.40 |
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| Schedule of Stock-based Compensation, Options Outstanding and Exercisable under Stock Option Plans, by Exercise Price Range [Table Text Block] |
| Options Outstanding | | | Options Exercisable | | | | | | | | | | | | | | | | | | | | | | | | | | | | Weighted | | Weighted | | Aggregate | | | | Weighted | | Weighted | | Aggregate | | | | | | Average | | Average | | Intrinsic | | | | Average | | Average | | Intrinsic | | Range of | | Number | | Remaining | | Exercise | | Value | | Number | | Remaining | | Exercise | | Value | | Exercise Prices | | Outstanding | | Life (Years) | | Price | | (In thousands) | | Exercisable | | Life (Years) | | Price | | (In thousands) | | $ | 7.17 - 9.52 | | 142,650 | | 1.4 | | | 8.97 | | | 2,315 | | 41,276 | | 1.8 | | | 7.60 | | | 726 | | $ | 12.08 - 12.41 | | 67,784 | | 3.4 | | | 12.39 | | | 868 | | 17,192 | | 3.4 | | | 12.34 | | | 221 | | $ | 14.00 - 16.01 | | 3,347 | | 0.4 | | | 15.80 | | | 31 | | 3,347 | | 0.4 | | | 15.80 | | | 31 | | $ | 20.35 | | 5,136 | | 0.4 | | | 20.35 | | | 25 | | 5,136 | | 0.4 | | | 20.35 | | | 25 | | | | 218,917 | | 2.0 | | | 10.40 | | $ | 3,239 | | 66,951 | | 2.0 | | | 10.21 | | $ | 1,003 |
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| Schedule of Stock-based Compensation, Restricted Stock Activity [Table Text Block] |
| | | | Weighted | | | | Average | | | | Grant-Date | | Non-vested restricted stock | Shares | | Fair Value | | Outstanding at December 31, 2010 | 954,029 | | $ | 7.90 | | Granted | 293,120 | | | 11.13 | | Vested | (419,704) | | | 5.93 | | Forfeited | (36,961) | | | 11.81 | | Outstanding at December 31, 2011 | 790,484 | | $ | 9.96 | | Granted | 92,689 | | | 14.69 | | Vested | (327,707) | | | 8.08 | | Forfeited | (31,499) | | | 10.49 | | Outstanding at December 31, 2012 | 523,967 | | $ | 11.94 | | Granted | 163,417 | | | 20.29 | | Vested | (160,738) | | | 11.05 | | Forfeited | (32,184) | | | 16.83 | | Outstanding at December 31, 2013 | 494,462 | | $ | 14.67 |
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