v3.5.0.2
SIGNIFICANT ACCOUNTING POLICIES - Other Policies (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies            
Allowance for doubtful accounts $ 0 $ 0   $ 0   $ 0
Interest capitalized during the period   0 $ 0 $ 0 $ 0  
Number of operating segments | segment       2    
Asset retirement obligations 0 0   $ 0   0
Liability for deferred taxes $ 800 800   800   1,100
Credit Concentration Risk | Trade Accounts Receivable | BP Plc            
Significant Accounting Policies            
Concentration risk (as a percent) 18.20%          
Credit Concentration Risk | Trade Accounts Receivable | Conoco Phillips [Member]            
Significant Accounting Policies            
Concentration risk (as a percent) 17.30%          
Credit Concentration Risk | Trade Accounts Receivable | Anadarko [Member]            
Significant Accounting Policies            
Concentration risk (as a percent) 13.40%          
Azure System Predecessor            
Significant Accounting Policies            
Liability for deferred taxes $ 800 800   $ 800   1,100
Scheduled Maintenance Projects            
Significant Accounting Policies            
Property, plant and equipment, Estimated useful lives       5 years    
Natural gas gathering agreement with a minimum revenue commitment (“MRC”)            
Significant Accounting Policies            
Agreement period       10 years    
Deferred revenue $ 18,500 18,500   $ 18,500   $ 11,600
Deferred revenue, revenue recognized   $ 0 $ 0 $ 0 $ 0