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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Level 1 [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets $ 0  
Level 2 [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets 25  
Level 3 [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets 0  
Fair Value, Measurements, Recurring [Member]    
Assets:    
Total assets 168 $ 495
Liabilities:    
Total liabilities 229,817 135,567
Fair Value, Measurements, Recurring [Member] | Money market funds [Member]    
Assets:    
Total assets 143 142
Fair Value, Measurements, Recurring [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets 25 353
Liabilities:    
Total liabilities 229,817 135,567
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets:    
Total assets 143 142
Liabilities:    
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money market funds [Member]    
Assets:    
Total assets 143 142
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets   0
Liabilities:    
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets:    
Total assets 25 353
Liabilities:    
Total liabilities 229,817 135,567
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money market funds [Member]    
Assets:    
Total assets 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets   353
Liabilities:    
Total liabilities 229,817 135,567
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets:    
Total assets 0 0
Liabilities:    
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Money market funds [Member]    
Assets:    
Total assets 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity derivative instruments [Member]    
Assets:    
Total assets   0
Liabilities:    
Total liabilities $ 0 $ 0