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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
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):
| Three Months Ended March 31,
| 2015 |  | 2014
Weighted-average common shares outstanding—basic | 78,271 |  |  | 78,992 |
Dilutive effect of potential common shares | 3,195 |  |  | 1,164 |
Weighted-average common shares outstanding—diluted | 81,466 |  |  | 80,156 |

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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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