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Loss per Share - Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Loss per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net Loss $ (277,353) $ (449,305)
Weighted Average Shares, basic (in shares) 35,689,000 35,427,000
Loss Per Share, Basic (in dollars per share) $ (7.77) $ (12.68)
Effect of dilutive securities    
Net (Loss) Income, Restricted stock $ 0 $ 0
Weighted Average Shares, Restricted stock awards (in shares) 0 0
Net (Loss) Income, Performance share units $ 0 $ 0
Weighted Average Shares, Performance share units (in shares) 0 0
Net (Loss) Income, Warrants $ 0 $ 0
Weighted Average Shares, Warrants (in shares) 0 0
Net (Loss) Income, Diluted $ (277,353) $ (449,305)
Weighted Average Shares, Diluted (in shares) 35,689,000 35,427,000
(Loss) Earnings Per Share, Diluted (in dollars per share) $ (7.77) $ (12.68)
Warrants    
Effect of dilutive securities    
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0
Performance Share Units    
Effect of dilutive securities    
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0
Restricted Stock    
Effect of dilutive securities    
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0