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Earnings (Loss) Per Common Share and Stockholders' Equity (Schedule of Earnings (Loss) Per Common Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share, Basic and Diluted [Line Items]    
Net income (loss) available to common stockholders - numerator for earnings (loss) per common share $ 236,336 $ (30,010)
Weighted average common shares outstanding (shares) 91,644,315 90,883,254
Denominator for earnings (loss) per common share - assuming dilution (shares) 92,021,079 91,743,759
Earnings (loss) per common share $ 2.58 $ (0.33)
Earnings (loss) per common share - assuming dilution $ 2.57 $ (0.33)
Stock Options and Deferred Compensation Agreements    
Earnings Per Share, Basic and Diluted [Line Items]    
Effect of dilutive securities: share-based payment arrangements (shares) 137,289 455,001
Restricted Stock and Restricted Stock Units    
Earnings Per Share, Basic and Diluted [Line Items]    
Effect of dilutive securities: share-based payment arrangements (shares) 239,475 405,504
Stock Options    
Earnings Per Share, Basic and Diluted [Line Items]    
Antidilutive securities excluded from computation of earnings (loss) per common share, amount (shares) 50,000 0
Antidilutive securities excluded from computation of earnings (loss) per common share, exercise price $ 26.70