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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Net (loss) income attributable to common shareholders $ (385,534) $ 83,593 $ (348,850) $ 132,355
Denominator        
Weighted average common shares outstanding - basic 93,602 93,598 93,600 93,598
Weighted average common shares outstanding - diluted 93,602 93,598 93,600 93,598
(Loss) earnings per common share, basic and diluted $ (4.12) $ 0.89 $ (3.73) $ 1.41
Potentially dilutive securities   0   0