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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Line Items]        
Net income available to common stockholders - numerator for earnings per common share $ 141,947 $ 661,250 $ 348,099 $ 644,207
Weighted average common shares outstanding (shares) 92,478,154 91,861,167 94,325,984 91,769,932
Denominator for earnings per common share - assuming dilution 93,043,660 92,163,272 94,867,400 92,070,735
Earnings per common share $ 1.53 $ 7.20 $ 3.69 $ 7.02
Earnings per common share - assuming dilution $ 1.53 $ 7.17 $ 3.67 $ 7.00
Stock Options and Deferred Compensation Agreements        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 237,076 55,926 224,519 85,493
Restricted Stock and Restricted Stock Units        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 328,430 246,179 316,897 215,310
Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of diluted earnings per common share, amount (shares) 336,598 522,671 226,598 50,000
Antidilutive securities excluded from computation of diluted earnings per common share, exercise price       $ 26.70
Stock Options | Minimum        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of diluted earnings per common share, exercise price $ 31.31 $ 24.71 $ 31.63  
Stock Options | Maximum        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of diluted earnings per common share, exercise price $ 32.58 $ 26.70 $ 32.58