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Debt - NG Advantage Debt and Financing Lease Obligations (Details)
$ in Millions
1 Months Ended
Jan. 17, 2019
USD ($)
installment
Dec. 20, 2018
USD ($)
Mar. 01, 2018
USD ($)
installment
Dec. 18, 2017
USD ($)
installment
Oct. 31, 2019
USD ($)
Jan. 07, 2019
Jan. 24, 2017
USD ($)
installment
Nov. 30, 2016
USD ($)
installment
May 12, 2016
USD ($)
installment
Compression Station                  
Long-term debt                  
Sale leaseback transaction, purchase price   $ 7.0              
Sale leaseback transaction, term   5 years              
Annual rate (as a percent)   12.00%              
Sale leaseback transaction, monthly rental payments   $ 0.1              
Sale leaseback transaction, rent expense   4.7              
Sale leaseback transaction, rent expense, repayment of promissory note   $ 2.0              
Compression Equipment                  
Long-term debt                  
Sale leaseback transaction, purchase price         $ 7.5        
Proceeds from sale of equipment in sale-leaseback agreement         $ 5.3        
Sale leaseback transaction, term         5 years        
Annual rate (as a percent)         10.47%        
Sale Leaseback Transaction, Security Deposit, Amount         $ 2.2        
BoA | BoA MLA                  
Long-term debt                  
Proceeds from sale of equipment in sale-leaseback agreement       $ 2.1          
Sale leaseback transaction, term       5 years          
Number of equal monthly installments | installment       60          
Annual rate (as a percent)       4.86%          
First National | First National MLA                  
Long-term debt                  
Net proceeds, financing activities     $ 6.3            
Sale leaseback transaction, term     6 years            
Number of equal monthly installments | installment     72            
First National | Nations MLA                  
Long-term debt                  
Annual rate (as a percent)     9.28%            
Nations Fund I, LLC | Nations MLA                  
Long-term debt                  
Proceeds from sale of equipment in sale-leaseback agreement $ 3.4                
Sale leaseback transaction, term 4 years                
Number of equal monthly installments | installment 48                
Annual rate (as a percent)           9.18%      
NG Advantage debt | 4.41% Term Loan | Commerce Bank & Trust Company                  
Long-term debt                  
Debt issuance amount                 $ 6.3
Number of monthly installments | installment                 84
Interest rate (as a percent)                 4.41%
NG Advantage debt | 5.0% Term Loan | Commerce Bank & Trust Company                  
Long-term debt                  
Debt issuance amount             $ 6.2    
Number of monthly installments | installment             84    
Interest rate (as a percent)             5.00%    
NG Advantage debt | 5.17% Term Loan | Wintrust Commercial Finance                  
Long-term debt                  
Debt issuance amount               $ 4.7  
Number of monthly installments | installment               72  
Interest rate (as a percent)               5.17%