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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| Income |  | Shares |  | Per Share |  | Income |  | Shares |  | Per Share |  | Income |  | Shares |  | Per Share
Basic net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 23,578 |  |  | 11,251 |  |  | $ | 2.10 |  |  | $ | 55,086 |  |  | 11,382 |  |  | $ | 4.84 |  |  | $ | 47,241 |  |  | 12,302 |  |  | $ | 3.84 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock | — |  |  | — |  |  |  |  | — |  |  | — |  |  |  |  | — |  |  | 21 |  |  |
Non-vested restricted stock | — |  |  | 16 |  |  |  |  |  | — |  |  | 25 |  |  |  |  |  | — |  |  | 49 |  |  |  |
Diluted net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders plus assumed conversions | $ | 23,578 |  |  | 11,267 |  |  | $ | 2.09 |  |  | $ | 55,086 |  |  | 11,407 |  |  | $ | 4.83 |  |  | $ | 47,241 |  |  | 12,372 |  |  | $ | 3.82 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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