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Earnings Per Share (Computation of Basic and Diluted Earnings per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 03, 2018
Jun. 30, 2019
Jun. 03, 2018
Jun. 30, 2019
Successor Company          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Undistributed net income from operations $ 4,980   $ 42,861   $ 43,312
Basic weighted average shares outstanding (in shares) 20,004,736   20,125,419    
Diluted weighted average shares outstanding (in shares) 20,300,025       20,268,393
Predecessor Company          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Undistributed net income from operations   $ 701,157   $ 696,156  
Basic weighted average shares outstanding (in shares)   29,338,329   29,338,329  
Diluted weighted average shares outstanding (in shares)   29,338,329   29,338,329  
Basic Share | Successor Company          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Undistributed net income from operations $ 4,980       $ 43,312
Basic net income attributable to common shares $ 4,980   $ 42,861   $ 43,312
Basic weighted average shares outstanding (in shares) 20,005,000       20,091,568
Basic undistributed net income (loss) per share attributable to common shares (usd per share) $ 0.25   $ 2.13   $ 2.16
Basic Share | Predecessor Company          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Undistributed net income from operations   $ 701,157   $ 696,156  
Basic net income attributable to common shares   $ 701,157   $ 696,156  
Basic weighted average shares outstanding (in shares)   29,338,000   29,338,000  
Basic undistributed net income (loss) per share attributable to common shares (usd per share)   $ 23.90   $ 23.73  
Diluted Share | Successor Company          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Undistributed net income from operations $ 4,980   $ 42,861   $ 43,312
Basic weighted average shares outstanding (in shares) 20,005,000   20,125,000   20,092,000
Basic undistributed net income (loss) per share attributable to common shares (usd per share) $ 250.00   $ 2.11   $ 2.14
Diluted net income (loss) attributable to common shares $ 4,980   $ 42,861   $ 43,312
Effect of dilutive options and restricted share units (in shares) 295,000   192,000   177,000
Diluted weighted average shares outstanding (in shares) 20,300,000   20,317,000   20,269,000
Diluted Share | Predecessor Company          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Undistributed net income from operations   $ 701,157   $ 696,156  
Basic weighted average shares outstanding (in shares)   29,338,000   29,338,000  
Basic undistributed net income (loss) per share attributable to common shares (usd per share)   $ 23.90   $ 23.73  
Diluted net income (loss) attributable to common shares   $ 701,157   $ 696,156  
Effect of dilutive options and restricted share units (in shares)   0   0  
Diluted weighted average shares outstanding (in shares)   29,338,000   29,338,000