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Earnings Per Share (Reconciliation of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic EPS: [Abstract]                      
Net income from continuing operations                 $ 165,861 $ 141,827 $ 107,415
Loss on disposal of discontinued operations                 0 0 (997)
Net income $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 41,350 $ 53,162 $ 29,341 $ 17,974 $ 165,861 $ 141,827 $ 106,418
Net income, basic shares                 57,212 56,310 55,638
Basic net income from continuing operations                 $ 2.90 $ 2.52 $ 1.93
Basic net loss from discontinued operations                 0.00 0.00 (0.02)
Basic net income $ 0.79 $ 0.82 $ 0.59 $ 0.70 $ 0.73 $ 0.94 $ 0.52 $ 0.32 $ 2.90 $ 2.52 $ 1.91
Effect of dilutive securities: [Abstract]                      
Stock compensation plans, shares                 $ 944 $ 1,041 $ 1,172
Earnings Per Share, Diluted [Abstract]                      
Net income from continuing operations                 165,861 141,827 107,415
Loss on disposal of discontinued operations                 0 0 (997)
Net income $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 41,350 $ 53,162 $ 29,341 $ 17,974 $ 165,861 $ 141,827 $ 106,418
Shares net income, Diluted                 58,156 57,351 56,810
Diluted net income from continuing operations                 $ 2.85 $ 2.47 $ 1.89
Diluted net loss from discontinued operations                 0.00 0.00 (0.02)
Diluted net income $ 0.78 $ 0.81 $ 0.58 $ 0.69 $ 0.72 $ 0.93 $ 0.51 $ 0.31 $ 2.85 $ 2.47 $ 1.87