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Capital Structure and Per Share Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Dilutive Effect on Earnings Per Share | The following table illustrates the dilutive effect of such items on earnings per share for 2017, 2016 and 2015:
|  | Year Ended December 31, 2017 |
|  |  |  |  |  | Income (Loss) |  |  | Income (Loss) |  |  |  |  |  |  |  |  |
|  |  |  |  |  | From Continuing |  |  | From Discontinued |  |  | Net |
|  |  |  |  |  | Operations |  |  | Operations |  |  | Income (Loss) |
|  | Weighted |  |  |  |  |  |  | Per |  |  |  |  |  |  | Per |  |  |  |  |  |  | Per |
|  | Average |  |  |  |  |  |  | Share |  |  |  |  |  |  | Share |  |  |  |  |  |  | Share |
|  | Shares |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |
|  | (In thousands, except per share amounts) |
Earnings (loss) and shares |  |  | 43,997 |  |  | $ | 94,153 |  |  |  |  |  |  | $ | (1,170 | ) |  |  |  |  |  | $ | 92,983 |  |  |  |  |
Effect of participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested restricted stock |  |  |  |  |  |  | (85 | ) |  |  |  |  |  |  | - |  |  |  |  |  |  |  | (85 | ) |  |  |  |
Basic earnings (loss) and shares |  |  | 43,997 |  |  | $ | 94,068 |  |  | $ | 2.14 |  |  | $ | (1,170 | ) |  | $ | (0.03 | ) |  | $ | 92,898 |  |  | $ | 2.11 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans |  |  | 361 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) and shares |  |  | 44,358 |  |  | $ | 94,068 |  |  | $ | 2.12 |  |  | $ | (1,170 | ) |  | $ | (0.03 | ) |  | $ | 92,898 |  |  | $ | 2.09 |
|  | Year Ended December 31, 2016 |
|  |  |  |  |  | Income (Loss) |  |  | Income (Loss) |  |  |  |  |  |  |  |  |
|  |  |  |  |  | From Continuing |  |  | From Discontinued |  |  | Net |
|  |  |  |  |  | Operations |  |  | Operations |  |  | Income (Loss) |
|  | Weighted |  |  |  |  |  |  | Per |  |  |  |  |  |  | Per |  |  |  |  |  |  | Per |
|  | Average |  |  |  |  |  |  | Share |  |  |  |  |  |  | Share |  |  |  |  |  |  | Share |
|  | Shares |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |
|  | (In thousands, except per share amounts) |
Earnings (loss) and shares |  |  | 45,637 |  |  | $ | 94,516 |  |  |  |  |  |  | $ | (1,323 | ) |  |  |  |  |  | $ | 93,193 |  |  |  |  |
Effect of participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested restricted stock |  |  |  |  |  |  | (52 | ) |  |  |  |  |  |  | - |  |  |  |  |  |  |  | (52 | ) |  |  |  |
Basic earnings (loss) and shares |  |  | 45,637 |  |  | $ | 94,464 |  |  | $ | 2.07 |  |  | $ | (1,323 | ) |  | $ | (0.03 | ) |  | $ | 93,141 |  |  | $ | 2.04 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans |  |  | 311 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) and shares |  |  | 45,948 |  |  | $ | 94,464 |  |  | $ | 2.06 |  |  | $ | (1,323 | ) |  | $ | (0.03 | ) |  | $ | 93,141 |  |  | $ | 2.03 |
|  | Year Ended December 31, 2015 |
|  |  |  |  |  | Income (Loss) |  |  | Income (Loss) |  |  |  |  |  |  |  |  |
|  |  |  |  |  | From Continuing |  |  | From Discontinued |  |  | Net |
|  |  |  |  |  | Operations |  |  | Operations |  |  | Income (Loss) |
|  | Weighted |  |  |  |  |  |  | Per |  |  |  |  |  |  | Per |  |  |  |  |  |  | Per |
|  | Average |  |  |  |  |  |  | Share |  |  |  |  |  |  | Share |  |  |  |  |  |  | Share |
|  | Shares |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |  |  | Amount |
|  | (In thousands, except per share amounts) |
Earnings (loss) and shares |  |  | 50,489 |  |  | $ | 88,091 |  |  |  |  |  |  | $ | (1,780 | ) |  |  |  |  |  | $ | 86,311 |  |  |  |  |
Effect of participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested restricted stock and restricted stock units |  |  |  |  |  |  | (36 | ) |  |  |  |  |  |  | - |  |  |  |  |  |  |  | (36 | ) |  |  |  |
Basic earnings (loss) and shares |  |  | 50,489 |  |  | $ | 88,055 |  |  | $ | 1.74 |  |  | $ | (1,780 | ) |  | $ | (0.03 | ) |  | $ | 86,275 |  |  | $ | 1.71 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans |  |  | 394 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) and shares |  |  | 50,883 |  |  | $ | 88,055 |  |  | $ | 1.73 |  |  | $ | (1,780 | ) |  | $ | (0.03 | ) |  | $ | 86,275 |  |  | $ | 1.70 |

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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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