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Earnings Per Share (Text Block) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings (Loss) Per Share 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 |
Stock-based Awards For stock-based awards, the dilutive effect is calculated using the treasury stock method. Under this method, the dilutive effect is computed as if the awards were exercised at the beginning of the period (or at time of issuance, if later) and assumes the related proceeds were used to repurchase common stock at the average market price during the period. Related proceeds include the amount the employee must pay upon exercise and the future compensation cost associated with the stock award. Approximately 0.2 million stock-based awards were excluded from the calculation of diluted EPS for both the three and nine months ended September 30, 2017 because they were anti-dilutive. Approximately 0.9 million and 0.8 million stock-based awards were excluded from the calculation of diluted EPS for the three and nine months ended September 30, 2016 because they were anti-dilutive. These stock-based awards could be dilutive in future periods.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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