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Pledged Assets and Debt - Subsidiary Notes Payable (Details) - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended
Jan. 15, 2019
Dec. 12, 2018
Apr. 25, 2017
Dec. 12, 2018
Nov. 30, 2018
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2016
Sep. 09, 2019
Dec. 31, 2018
May 24, 2016
Jul. 19, 2014
Debt                        
Financial Designation, Predecessor and Successor [Fixed List]   Predecessor   Predecessor Predecessor   Predecessor Predecessor        
Net principal, current           $ 127       $ 884    
Net principal, noncurrent           74,231       70,938    
Purchase of secured notes           (2,000)            
Term note with a non-related entity                        
Debt                        
Face amount of debt                       $ 1,069
Outstanding amount           777            
Credit Facility                        
Debt                        
Amount repaid of the outstanding borrowings. $ 2,000                      
Purchase of secured notes 2,000                      
Outstanding amount           40,000            
Credit Facility | Common units B                        
Debt                        
Outstanding amount $ 7,143                      
Subsidiary notes payable                        
Debt                        
Deferred issuance costs           373       16    
Deferred issuance costs, current           1       0    
Deferred Issuance costs, noncurrent           372       16    
Subsidiary notes payable | Revolving Credit Facility Due April 2021                        
Debt                        
Principal, noncurrent           73,000       70,000    
Deferred Issuance costs, noncurrent           367       16    
Net principal, noncurrent           72,633       69,984    
Subsidiary notes payable | Term Note, secured, due November 2024                        
Debt                        
Principal, noncurrent           777       822    
Net principal, noncurrent           777       822    
Face amount of debt           $ 1,425       $ 1,425    
Interest rate (as a percent)           4.75%       4.75%    
Subsidiary notes payable | Note, Secured, due April 2019                        
Debt                        
Financial Designation, Predecessor and Successor [Fixed List]     Predecessor     Predecessor            
Principal     $ 63,500     $ 70,000            
Subsidiary notes payable | Note, secured, due April 2020                        
Debt                        
Principal           73,000     $ 70,000      
Face amount of debt           $ 73,000       $ 73,000    
Interest rate (as a percent)           16.75%       16.75%    
Subsidiary notes payable | Term Note, secured, due May 2021                        
Debt                        
Principal, noncurrent           $ 954       $ 1,016    
Deferred Issuance costs, noncurrent           6            
Net principal, noncurrent           948       1,016    
Face amount of debt           $ 1,165       $ 1,165 $ 1,165  
Interest rate (as a percent)           4.50%       4.50%    
Guarantor Subsidiaries | Term note with a non-related entity                        
Debt                        
Face amount of debt                       $ 1,425
Outstanding amount           $ 1,036