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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, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic EPS: [Abstract]                      
Net income $ 45,760 $ 55,435 $ 58,819 $ 18,925 $ 30,242 $ 46,718 $ 41,426 $ 50,440 $ 178,939 $ 168,826 $ 158,495
Net income, basic shares                 58,950 58,458 57,889
Basic net income per share $ 0.77 $ 0.94 $ 1.00 $ 0.32 $ 0.52 $ 0.80 $ 0.71 $ 0.87 $ 3.04 $ 2.89 $ 2.74
Effect of dilutive securities: [Abstract]                      
Stock compensation plans, shares                 763 899 858
Earnings Per Share, Diluted [Abstract]                      
Net income $ 45,760 $ 55,435 $ 58,819 $ 18,925 $ 30,242 $ 46,718 $ 41,426 $ 50,440 $ 178,939 $ 168,826 $ 158,495
Shares net income, Diluted                 59,713 59,357 58,747
Diluted net income per share $ 0.76 $ 0.93 $ 0.99 $ 0.32 $ 0.51 $ 0.79 $ 0.70 $ 0.85 $ 3.00 $ 2.84 $ 2.70
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.