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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The reconciliations of the denominators of the basic and diluted earnings per share computations are as follows (in thousands):
| Years Ended December 31,
| 2014 |  | 2013 |  | 2012
Weighted average common shares outstanding—basic | 78,180 |  |  | 76,821 |  |  | 75,498 |
Dilutive effect of potential common shares | 2,314 |  |  | 567 |  |  | 149 |
Weighted average common shares outstanding—diluted | 80,494 |  |  | 77,388 |  |  | 75,647 |

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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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