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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Weighted average common shares outstanding—basic | 89,056 |  |  | 88,896 |  |  | 84,180 |
Dilutive effect of potential common shares | 120 |  |  | 158 |  |  | 161 |
Weighted average common shares outstanding—diluted | 89,176 |  |  | 89,054 |  |  | 84,341 |

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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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