Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Details)

v3.19.3
Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets $ 18,214 $ 34,932
Derivative liabilities 4,308 991
Derivative assets 4,311 10,100
Derivative Liability, Noncurrent 12 0
Derivative Liability 4,320 991
Derivative Asset 22,525 45,032
Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative Liability 18,200  
Commodity contracts | Current Derivative Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 18,214 34,932
Derivative liabilities 4,308 991
Commodity contracts | Noncurrent Derivative Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 4,311 10,100
Derivative Liability, Noncurrent 12 0
Fair Value, Measurements, Recurring | Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets 18,214 34,932
Derivative liabilities (4,308) (991)
Derivative assets 4,311 10,100
Derivative Liability, Noncurrent $ 12 $ 0