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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic EPS: [Abstract]                      
Net income from continuing operations $ 1,308 $ 18,274 $ 288 $ 18,093 $ 18,034 $ (17,318) $ 1,467 $ 20,500 $ 37,963 $ 22,683 $ 70,746
Loss on disposal of discontinued operations                 0 (650) (3,780)
Net income, basic shares                 54,880 54,095 53,359
Basic net income from continuing operations                 $ 0.69 $ 0.42 $ 1.33
Basic net loss from discontinued operations                 $ 0.00 $ (0.01) $ (0.07)
Basic net income per share $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 0.33 $ (0.33) $ 0.03 $ 0.38 $ 0.69 $ 0.41 $ 1.26
Effect of dilutive securities: [Abstract]                      
Stock compensation plans, shares                 1,053 1,126 1,145
Earnings Per Share, Diluted [Abstract]                      
Net income from continuing operations 1,308 18,274 288 18,093 18,034 (17,318) 1,467 20,500 37,963 22,683 70,746
Loss on disposal of discontinued operations                 0 (650) (3,780)
Net income available to common stockholders $ 1,308 $ 18,274 $ 288 $ 18,093 $ 18,034 $ (17,968) $ 1,467 $ 20,500 $ 37,963 $ 22,033 $ 66,966
Weighted Average Number of Shares Outstanding, Diluted                 55,933 55,221 54,504
Diluted net income from continuing operations                 $ 0.68 $ 0.41 $ 1.30
Diluted net loss from disposal of discontinued operations                 $ 0.00 $ (0.01) $ (0.07)
Diluted net income per share $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 0.33 $ (0.33) $ 0.03 $ 0.37 $ 0.68 $ 0.40 $ 1.23