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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per share (EPS):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands, except per share data)
Net income available to common shareholders | $ | 14,097 |  |  | $ | 19,917 |  |  | $ | 29,942 |  |  | $ | 30,006 |
Weighted average common shares outstanding - Basic | 38,683 |  |  | 38,236 |  |  | 38,579 |  |  | 38,147 |
Dilutive effect of stock-based awards | 649 |  |  | 280 |  |  | 695 |  |  | 299 |
Weighted average common shares outstanding - Diluted | 39,332 |  |  | 38,516 |  |  | 39,274 |  |  | 38,446 |
Earnings per common share - Basic | $ | 0.36 |  |  | $ | 0.52 |  |  | $ | 0.78 |  |  | $ | 0.79 |
Earnings per common share - Diluted | $ | 0.36 |  |  | $ | 0.52 |  |  | $ | 0.76 |  |  | $ | 0.78 |

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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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