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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic EPS: [Abstract]                      
Net income from continuing operations $ 25,335 $ 32,653 $ 27,122 $ 22,305 $ 1,308 $ 18,274 $ 288 $ 18,093 $ 107,415 $ 37,963 $ 22,683
Loss on disposal of discontinued operations                 (997) 0 (650)
Net income 25,335 32,653 27,122 21,308 1,308 18,274 288 18,093 106,418 37,963 22,033
Net income, basic shares                 55,638 54,880 54,095
Basic net income from continuing operations                 $ 1.93 $ 0.69 $ 0.42
Basic net loss from discontinued operations                 $ (0.02) $ 0.00 $ (0.01)
Basic net income $ 0.45 $ 0.59 $ 0.49 $ 0.38 $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 1.91 $ 0.69 $ 0.41
Effect of dilutive securities: [Abstract]                      
Stock compensation plans, shares                 1,172 1,053 1,126
Earnings Per Share, Diluted [Abstract]                      
Net income from continuing operations 25,335 32,653 27,122 22,305 1,308 18,274 288 18,093 107,415 37,963 22,683
Loss on disposal of discontinued operations                 (997) 0 (650)
Net income $ 25,335 $ 32,653 $ 27,122 $ 21,308 $ 1,308 $ 18,274 $ 288 $ 18,093 $ 106,418 $ 37,963 $ 22,033
Shares net income, Diluted                 56,810 55,933 55,221
Diluted net income from continuing operations                 $ 1.89 $ 0.68 $ 0.41
Diluted net loss from discontinued operations                 $ (0.02) $ 0.00 $ (0.01)
Diluted net income $ 0.44 $ 0.57 $ 0.48 $ 0.38 $ 0.02 $ 0.33 $ 0.01 $ 0.33 $ 1.87 $ 0.68 $ 0.40