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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic EPS: [Abstract]                      
Net income, basic shares                 59,862 59,421 58,950
Basic net income per share $ 2.12 $ 1.17 $ 0.57 $ 0.26 $ 1.38 $ 0.94 $ 1.22 $ 1.04 $ 4.12 $ 4.57 $ 3.04
Effect of dilutive securities: [Abstract]                      
Stock compensation plans, shares                 431 583 763
Earnings Per Share, Diluted [Abstract]                      
Shares net income, Diluted                 60,293 60,004 59,713
Diluted net income per share $ 2.10 $ 1.16 $ 0.57 $ 0.25 $ 1.36 $ 0.93 $ 1.21 $ 1.02 $ 4.09 $ 4.53 $ 3.00
Net Income available to common stockholders $ 127,061 $ 69,875 $ 34,183 $ 15,236 $ 81,859 $ 56,150 $ 72,266 $ 61,348 $ 246,355 $ 271,623 $ 178,939