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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | Restricted share activity is summarized as follows (in thousands, except per share data):
|  | Shares Outstanding |  | Weighted Average Grant Date Fair Value |
Unvested restricted stock at December 31, 2014 |  |  | 239 |  | $ | 26.24 |
Restricted stock granted |  |  | 86 |  | $ | 33.46 |
Restricted stock vested |  |  | (80) |  | $ | 25.13 |
Restricted stock forfeited |  |  | (32) |  | $ | 29.54 |
Unvested restricted stock at December 31, 2015 |  |  | 213 |  | $ | 29.07 |
Restricted stock granted |  |  | 93 |  | $ | 37.67 |
Restricted stock vested |  |  | (72) |  | $ | 27.07 |
Restricted stock forfeited |  |  | (6) |  | $ | 35.58 |
Unvested restricted stock at December 31, 2016 |  |  | 228 |  | $ | 33.02 |
Restricted stock granted |  |  | 88 |  | $ | 48.59 |
Restricted stock vested |  |  | (78) |  | $ | 30.95 |
Restricted stock forfeited |  |  | (11) |  | $ | 39.68 |
Unvested restricted stock at December 31, 2017 |  |  | 227 |  | $ | 39.47 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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