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Capital Structure and Per Share Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Capital Structure and Per Share Data [Abstract] |
Dilutive effect on earnings per share | The following table illustrates the dilutive effect of such items on earnings per share for the years ended December 31, 2012, 2011 and 2010:
|  | Year Ended December 31, 2012 |
|  | Weighted Average Shares |  |  | Income (Loss) From Continuing Operations |  |  | Income (Loss) From Discontinued Operations |  |  | Net Income (Loss) |
|  |  | Amount |  |  | Per Share Amount |  |  | Amount |  |  | Per Share Amount |  |  | Amount |  |  | Per Share Amount |
|  |  |  |  | (In thousands, except per share amounts) |  |  |  |  |  |  |
Earnings (loss) and shares |  |  | 53,550 |  |  | $ | 91,261 |  |  |  |  |  |  | $ | (2,160 | ) |  |  |  |  |  | $ | 89,101 |  |  |  |  |
Effect of participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested restricted stock and stock units |  |  |  |  |  |  | (1,381 | ) |  |  |  |  |  |  | — |  |  |  |  |  |  |  | (1,381 | ) |  |  |  |
Basic earnings (loss) and shares |  |  | 53,550 |  |  | $ | 89,880 |  |  | $ | 1.68 |  |  | $ | (2,160 | ) |  | $ | (0.04 | ) |  | $ | 87,720 |  |  | $ | 1.64 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingently convertible debt (5.0% Convertible Notes) |  |  | 6,411 |  |  |  | 4,617 |  |  |  |  |  |  |  | 64 |  |  |  |  |  |  |  | 4,681 |  |  |  |  |
Stock compensation plans |  |  | 445 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) and shares |  |  | 60,406 |  |  | $ | 94,497 |  |  | $ | 1.56 |  |  | $ | (2,096 | ) |  | $ | (0.03 | ) |  | $ | 92,401 |  |  | $ | 1.53 |
|  | Year Ended December 31, 2011 |
|  | Weighted Average Shares |  |  | Income (Loss) From Continuing Operations |  |  | Income (Loss) From Discontinued Operations |  |  | Net Income (Loss) |
|  |  | Amount |  |  | Per Share Amount |  |  | Amount |  |  | Per Share Amount |  |  | Amount |  |  | Per Share Amount |
|  | (In thousands, except per share amounts) |
Earnings (loss) and shares |  |  | 52,358 |  |  | $ | 81,531 |  |  |  |  |  |  | $ | (5,277 | ) |  |  |  |  |  | $ | 76,254 |  |  |  |  |
Effect of participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested restricted stock and stock units |  |  |  |  |  |  | (1,056 | ) |  |  |  |  |  |  | — |  |  |  |  |  |  |  | (1,056 | ) |  |  |  |
Basic earnings (loss) and shares |  |  | 52,358 |  |  | $ | 80,475 |  |  | $ | 1.54 |  |  | $ | (5,277 | ) |  | $ | (0.10 | ) |  | $ | 75,198 |  |  | $ | 1.44 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingently convertible debt (5.0% Convertible Notes) |  |  | 12,517 |  |  |  | 9,093 |  |  |  |  |  |  |  | 207 |  |  |  |  |  |  |  | 9,300 |  |  |  |  |
Stock compensation plans |  |  | 589 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) and shares |  |  | 65,464 |  |  | $ | 89,568 |  |  | $ | 1.37 |  |  | $ | (5,070 | ) |  | $ | (0.08 | ) |  | $ | 84,498 |  |  | $ | 1.29 |
|  | Year Ended December 31, 2010 |
|  | Weighted Average Shares |  |  | Income (Loss) From Continuing Operations |  |  | Income (Loss) From Discontinued Operations |  |  | Net Income (Loss) |
|  |  | Amount |  |  | Per Share Amount |  |  | Amount |  |  | Per Share Amount |  |  | Amount |  |  | Per Share Amount |
|  | (In thousands, except per share amounts) |
Earnings (loss) and shares |  |  | 52,214 |  |  | $ | 98,862 |  |  |  |  |  |  | $ | (8,933 | ) |  |  |  |  |  | $ | 89,929 |  |  |  |  |
Effect of participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested restricted stock and stock units |  |  |  |  |  |  | (950 | ) |  |  |  |  |  |  | — |  |  |  |  |  |  |  | (950 | ) |  |  |  |
Basic earnings (loss) and shares |  |  | 52,214 |  |  | $ | 97,912 |  |  | $ | 1.88 |  |  | $ | (8,933 | ) |  | $ | (0.18 | ) |  | $ | 88,979 |  |  | $ | 1.70 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingently convertible debt (5.0% Convertible Notes) |  |  | 12,890 |  |  |  | 8,765 |  |  |  |  |  |  |  | 288 |  |  |  |  |  |  |  | 9,053 |  |  |  |  |
Stock compensation plans |  |  | 690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (loss) and shares |  |  | 65,794 |  |  | $ | 106,677 |  |  | $ | 1.62 |  |  | $ | (8,645 | ) |  | $ | (0.13 | ) |  | $ | 98,032 |  |  | $ | 1.49 |

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