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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 following table provides a reconciliation of the number of common shares used in computing basic and diluted earnings per share:
|  | Year Ended December 31,
(In thousands) |  | 2017 |  | 2016 |  | 2015
Weighted average shares outstanding - basic |  | 82,308,417 |  |  | 83,112,012 |  |  | 85,378,480 |
Dilutive effect of share-based awards |  | 98,651 |  |  | 41,647 |  |  | — |
Weighted average shares outstanding - diluted |  | 82,407,068 |  |  | 83,153,659 |  |  | 85,378,480 |

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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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