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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 (loss) per share (EPS):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands, except per share data)
Net income (loss) available to common shareholders | $ | 25,576 |  |  | $ | (9,885 | ) |  | $ | 55,518 |  |  | $ | 20,121 |
Weighted average common shares outstanding - Basic | 38,713 |  |  | 38,248 |  |  | 38,624 |  |  | 38,181 |
Dilutive effect of stock-based awards | 754 |  |  | — |  |  | 715 |  |  | 334 |
Weighted average common shares outstanding - Diluted | 39,467 |  |  | 38,248 |  |  | 39,339 |  |  | 38,515 |
Earnings (loss) per common share - Basic | $ | 0.66 |  |  | $ | (0.26 | ) |  | $ | 1.44 |  |  | $ | 0.53 |
Earnings (loss) per common share - Diluted | $ | 0.65 |  |  | $ | (0.26 | ) |  | $ | 1.41 |  |  | $ | 0.52 |

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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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