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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic EPS: [Abstract]                      
Net income $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 158,495 $ 165,861 $ 141,827
Net income, basic shares                 57,889 57,212 56,310
Basic net income $ 0.68 $ 0.66 $ 0.75 $ 0.64 $ 0.79 $ 0.82 $ 0.59 $ 0.70 $ 2.74 $ 2.90 $ 2.52
Effect of dilutive securities: [Abstract]                      
Stock compensation plans, shares                 $ 858 $ 944 $ 1,041
Earnings Per Share, Diluted [Abstract]                      
Net income $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 158,495 $ 165,861 $ 141,827
Shares net income, Diluted                 58,747 58,156 57,351
Diluted net income $ 0.67 $ 0.66 $ 0.74 $ 0.63 $ 0.78 $ 0.81 $ 0.58 $ 0.69 $ 2.70 $ 2.85 $ 2.47