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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 22, 2016
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2015
Successor [Member]        
Basic EPS:        
Net Income (Loss)   $ (156,288) $ 71,971  
Income, Share Amounts   10,013 11,453  
Earnings (Loss) Per Share, Basic   $ (15.61) $ 6.28  
Dilutive Securities:        
Dilutive RSA's, Shares   0 6  
Dilutive Restricted Stock Unit Awards   0 0  
Dilutive Stock Option Awards   0 55  
Diluted EPS:        
Net Income (Loss) Available to Common Stockholders, Diluted   $ (156,288) $ 71,971  
Weighted Average Number of Shares Outstanding, Diluted   10,013 11,514  
Earnings (Loss) Per Share, Diluted   $ (15.61) $ 6.25  
Successor [Member] | Stock Options [Member]        
Earnings Per Share (Textual) [Abstract]        
Antidilutive shares not included in the computation of diluted EPS   100 300  
Successor [Member] | Restricted Stock Units (RSUs) [Member]        
Earnings Per Share (Textual) [Abstract]        
Antidilutive shares not included in the computation of diluted EPS   200 100  
Predecessor [Member]        
Basic EPS:        
Net Income (Loss) $ 851,611     $ (1,653,971)
Income, Share Amounts 44,692     44,463
Earnings (Loss) Per Share, Basic $ 19.06     $ (37.20)
Dilutive Securities:        
Dilutive RSA's, Shares 1,005     0
Dilutive Restricted Stock Unit Awards 0     0
Dilutive Stock Option Awards 0     0
Diluted EPS:        
Net Income (Loss) Available to Common Stockholders, Diluted $ 851,611     $ (1,653,971)
Weighted Average Number of Shares Outstanding, Diluted 45,697     44,463
Earnings (Loss) Per Share, Diluted $ 18.64     $ (37.20)
Predecessor [Member] | Stock Options [Member]        
Earnings Per Share (Textual) [Abstract]        
Antidilutive shares not included in the computation of diluted EPS 1,300     1,300
Predecessor [Member] | Restricted Stock Awards [Member]        
Earnings Per Share (Textual) [Abstract]        
Antidilutive shares not included in the computation of diluted EPS 300     500
Predecessor [Member] | Restricted Stock Units (RSUs) [Member]        
Earnings Per Share (Textual) [Abstract]        
Antidilutive shares not included in the computation of diluted EPS 800     600