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Stock-Based Compensation Expense (Schedule of Grants Awarded) (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Jun. 04, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Jun. 03, 2018
Sep. 30, 2017
Stock option grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option grants (shares) 562,217          
Restricted stock unit grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-option equity grants (shares) 562,217          
Successor Company            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option grants (shares)       581,124,000    
Total grants in the Successor period (shares)       1,181,155,000    
Total expense       $ 1,783    
Successor Company | Stock option grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total expense       $ 466    
Successor Company | Restricted stock unit grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-option equity grants (shares)       600,031,000    
Total expense       $ 1,317    
Predecessor Company            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option grants (shares)     1,250,000   0 76,250,000
Total expense   $ 1,131 $ 354   $ 231 $ 1,422
Predecessor Company | Stock option grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total expense     $ 354   $ 231 $ 1,422