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Per Share Data and Stockholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] |  |  |  |
Weighted Average Share Earning (Loss) | 52,593 | 52,461 | 52,409 | 52,438
Income (loss) From Continuing Operations, Amount | $ 27,533 | $ 22,994 | $ 47,001 | $ 38,679
Income (Loss) From Discontinued Operations, Amount | 646 | (1,643) | 1,676 | (2,364)
Net income (loss), Amount | 28,179 | 21,351 | 48,677 | 36,315
Effect of participating securities: |  |  |  |
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units | (429) | (302) | (729) | (508)
Participating securities income (loss) from discontinuing operations non-vested restricted stock and stock units |  |  |  |
Participating securities net income (loss) attributable to parent non-vested restricted stock and stock units | (429) | (302) | (729) | (508)
Income Loss from Continuing Operations Basic | 27,104 | 22,692 | 46,272 | 38,171
Income (Loss) From Continuing Operations Basic earning (loss), Per Share Amount | $ 0.52 | $ 0.43 | $ 0.88 | $ 0.73
Income (Loss) From Discontinuing Operations Basic earning (loss), Amount | 646 | (1,643) | 1,676 | (2,364)
Income (Loss) From Continuing Operations Basic earning (loss), Per Share Amount | $ 0.01 | $ (0.03) | $ 0.03 | $ (0.05)
Net Income (Loss), Amount | 27,750 | 21,049 | 47,948 | 35,807
Income (Loss), Per Share Amount | $ 0.53 | $ 0.40 | $ 0.91 | $ 0.68
Effect of dilutive securities: |  |  |  |
Weighted Average Share Contingently convertible debt | 10,535 | 12,890 | 11,106 | 12,890
Income (Loss) From Continuing Operation Contingently Convertible debt, Amount | 1,889 | 2,280 | 4,056 | 4,576
Income (Loss) From Discontinuing Operation Contingently Convertible debt, Amount |  | 14 | 5 | 28
Net Income (Loss) Contingently Convertible debt, Amount | 1,889 | 2,294 | 4,061 | 4,604
Weighted Average Share, Stock compensation plans | 378 | 585 | 448 | 615
Weighted Average Shares, Diluted earnings (loss) | 63,506 | 65,936 | 63,963 | 65,943
Income (Loss) From Continuing Operations Diluted, Amount | 28,993 | 24,972 | 50,328 | 42,747
Income (Loss) From Continuing Operations Diluted, Per Share Amount | $ 0.46 | $ 0.38 | $ 0.79 | $ 0.65
Income (Loss) From Discontinuing Operations Diluted, Amount | 646 | (1,629) | 1,681 | (2,336)
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share | $ 0.01 | $ (0.03) | $ 0.02 | $ (0.04)
Net Income (Loss) Diluted, Amount | $ 29,639 | $ 23,343 | $ 52,009 | $ 40,411
Net Income (Loss) Diluted, Per Share Amount | $ 0.47 | $ 0.35 | $ 0.81 | $ 0.61

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