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Earnings Per Share (Reconciliation of EPS) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Basic EPS: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | $ 16,133 | [1] | $ (19,492) | [1] | $ 2,325 | [1] | $ 21,549 | [1] | $ 23,806 | [1] | $ 18,831 | [1] | $ 20,091 | [1] | $ 6,593 | [1] | $ 20,515 | $ 69,321 | $ 44,658
Net loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (7,086)
Loss on disposal of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (650) | (3,780) | (1,174)
Net income available to common stockholders | 16,133 |  | (20,142) |  | 2,325 |  | 21,549 |  | 23,775 |  | 17,197 |  | 18,766 |  | 5,803 |  | 19,865 | 65,541 | 36,398
Net income, basic shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,095 | 53,359 | 52,630
Basic net income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.38 | $ 1.30 | $ 0.84
Basic net loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.07) | $ (0.15)
Net loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.13)
Basic net loss on disposal of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.02)
Income Loss From Disposal Of Discontinued Operations Net Of Tax Per Basic Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.02)
Basic net income per share | $ 0.30 |  | $ (0.37) |  | $ 0.04 |  | $ 0.40 |  | $ 0.44 |  | $ 0.32 |  | $ 0.35 |  | $ 0.11 |  | $ 0.37 | $ 1.23 | $ 0.69
Effect of dilutive securities: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,126 | 1,145 | 767
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | 16,133 | [1] | (19,492) | [1] | 2,325 | [1] | 21,549 | [1] | 23,806 | [1] | 18,831 | [1] | 20,091 | [1] | 6,593 | [1] | 20,515 | 69,321 | 44,658
Net loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (7,086)
Loss on disposal of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (650) | (3,780) | (1,174)
Net income available to common stockholders | $ 16,133 |  | $ (20,142) |  | $ 2,325 |  | $ 21,549 |  | $ 23,775 |  | $ 17,197 |  | $ 18,766 |  | $ 5,803 |  | $ 19,865 | $ 65,541 | $ 36,398
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,221 | 54,504 | 53,397
Diluted net income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.37 | $ 1.27 | $ 0.83
Diluted net loss from disposal of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.07) | $ (0.15)
Net loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.13)
Net loss on disposal of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.02)
Diluted net income | $ 0.29 |  | $ (0.37) |  | $ 0.04 |  | $ 0.39 |  | $ 0.43 |  | $ 0.32 |  | $ 0.35 |  | $ 0.11 |  | $ 0.36 | $ 1.20 | $ 0.68
[1] | 1 See Note 12. "Discontinued Operations" for a discussion of discontinued operations.

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