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Level 3 Net Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Net Income Per Common Share [Table Text Block] | The following table sets forth the computation of basic and diluted net income per common share:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2013 |  | 2012 |  | 2013 |  | 2012
| (thousands, except per-share data)
Net income | $ | 15,860 |  |  | $ | 23,503 |  |  | $ | 107,108 |  |  | $ | 40,218 |
Weighted average common shares outstanding during the period (for basic calculation) | 40,625 |  |  | 29,700 |  |  | 40,486 |  |  | 29,700 |
Dilutive effect of other potential common shares | 15 |  |  | — |  |  | 6 |  |  | — |
Weighted average common shares and potential common shares (for diluted calculation) | 40,640 |  |  | 29,700 |  |  | 40,492 |  |  | 29,700 |
Net income per common share - Basic | $ | 0.39 |  |  | $ | 0.79 |  |  | $ | 2.65 |  |  | $ | 1.35 |
Net income per common share - Diluted | $ | 0.39 |  |  | $ | 0.79 |  |  | $ | 2.65 |  |  | $ | 1.35 |

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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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