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(Loss) Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method        
Basic earnings (loss) $ (34,074) $ 23,499 $ (74,968) $ 74,307
Weighted Average Shares, Basic 35,017,000 34,076,000 34,800,000 30,458,000
Basic earnings (loss) (in dollars per share) $ (0.97) $ 0.69 $ (2.15) $ 2.44
Effect of dilutive securities        
Restricted stock awards $ 0 $ 0 $ 0 $ 0
Restricted stock awards (in shares) 0 55,000 0 192,000
Performance share units $ 0 $ 0 $ 0 $ 0
Performance share units (in shares) 0 7,000 0 0
Warrants $ 0 $ 0 $ 0 $ 0
Warrants (shares) 0 0 0 0
Diluted earnings (loss) $ (34,074) $ 23,499 $ (74,968) $ 74,307
Weighted average shares, diluted 35,017,000 34,138,000 34,800,000 30,650,000
Diluted earnings (loss) per share (in dollars per share) $ (0.97) $ 0.69 $ (2.15) $ 2.42
Restricted Stock awards        
Potentially Dilutive Securities        
Antidilutive securities excluded from computation of earnings per share (in shares) 0      
Performance Share Units        
Potentially Dilutive Securities        
Antidilutive securities excluded from computation of earnings per share (in shares)       0
Warrants        
Potentially Dilutive Securities        
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 0 0