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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.