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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share, Basic and Diluted [Line Items]        
Net income (loss) available to common stockholders - numerator for earnings (loss) per common share $ (253,379) $ 18,590 $ (17,043) $ (11,420)
Weighted average common shares outstanding (shares) 91,803,312 91,103,151 91,723,814 90,993,810
Denominator for earnings (loss) per common share - assuming dilution (shares) 92,026,853 91,785,223 92,023,966 91,765,098
Earnings (loss) per common share $ (2.76) $ 0.20 $ (0.19) $ (0.13)
Earnings (loss) per common share - assuming dilution $ (2.76) $ 0.20 $ (0.19) $ (0.13)
Stock Options and Deferred Compensation Agreements        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 63,265 333,780 100,277 394,390
Restricted Stock and Restricted Stock Units        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 160,276 348,292 199,875 376,898
Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of earnings (loss) per common share, amount (shares) 519,285 0 50,000 0
Antidilutive securities excluded from computation of earnings (loss) per common share, exercise price     $ 26.70  
Minimum | Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of earnings (loss) per common share, exercise price $ 24.79      
Maximum | Stock Options        
Earnings Per Share, Basic and Diluted [Line Items]        
Antidilutive securities excluded from computation of earnings (loss) per common share, exercise price $ 26.70