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Earnings Per Common Share (Schedule of Basic and Diluted Earnings Per Share) (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
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income $ 58,300 $ 44,734 $ 36,582 $ 14,628 $ 46,129 $ 50,727 $ 51,724 $ 45,871 $ 154,244 $ 194,451 $ 172,882
Earnings allocated to participating securities - nonvested restricted shares                 $ 712 $ 1,530 $ 1,892
Weighted average common shares outstanding                 70,835 71,999 72,385
Basic earnings per common share $ 0.82 $ 0.63 $ 0.52 $ 0.20 $ 0.64 $ 0.70 $ 0.71 $ 0.63 $ 2.17 $ 2.68 $ 2.36
Basic earnings allocated to common shareholders                 $ 153,532 $ 192,921 $ 170,990
Earnings allocated to common shareholders, Diluted                 $ 153,532 $ 192,921 $ 170,990
Weighted average number of common shares outstanding                 70,835 71,999 72,385
Dilutive effect of equity awards and warrants                 45 33 5
Weighted average diluted common shares outstanding                 70,880 72,032 72,390
Diluted earnings per common share $ 0.82 $ 0.63 $ 0.52 $ 0.20 $ 0.64 $ 0.70 $ 0.71 $ 0.63 $ 2.17 $ 2.68 $ 2.36
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.                 289 8 4