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Earnings Per Common Share and Stockholders' Equity (Schedule of Earnings Per Common Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share, Basic and Diluted [Line Items]        
Net income available to common stockholders - numerator for earnings per common share $ 661,250 $ 37,360 $ 644,207 $ 25,940
Weighted average common shares outstanding (shares) 91,861,167 91,251,590 91,769,932 91,080,681
Denominator for earnings per common share - assuming dilution (shares) 92,163,272 91,710,557 92,070,735 91,747,862
Earnings per common share $ 7.20 $ 0.41 $ 7.02 $ 0.28
Earnings per common share - assuming dilution $ 7.17 $ 0.41 $ 7.00 $ 0.28
Stock Options and Deferred Compensation Agreements        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 55,926 190,137 85,493 326,306
Restricted Stock and Restricted Stock Units        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 246,179 268,830 215,310 340,875
Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of earnings per common share, amount (shares) 522,671 551,585 50,000 0
Antidilutive securities excluded from computation of earnings per common share, exercise price   $ 24.79 $ 26.70  
Minimum | Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of earnings per common share, exercise price $ 24.71      
Maximum | Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of earnings per common share, exercise price $ 26.70