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Risk Management Activities (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
MMBTU
$ / bbl
$ / MMBTU
bbl
Dec. 31, 2017
USD ($)
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities $ 1,569,000 $ 7,699,000
Liabilities from Price Risk Management Activities 132,618,000 50,429,000
Derivative Collateral [Abstract]    
Collateral Had on Derivative 0 0
Collateral Held on Derivative 0 0
Other Assets [Member] | Price Risk Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Other Assets 5,000,000 0
Liabilities From Price Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities 28,000,000 5,000,000
Liabilities from Price Risk Management Activities 161,000,000 55,000,000
Liabilities From Price Risk Management Activities [Member] | Price Risk Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities from Price Risk Management Activities [1] 133,000,000 50,000,000
Other Liabilities [Member] | Price Risk Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Other Liabilities 0 7,000,000
Assets From Price Risk Management Activities [Member] | Price Risk Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities $ 2,000,000 $ 8,000,000
Crude Oil [Member] | Midland Differential Basis Swaps [Member] | Derivative Contracts - January through October (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 15,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 1.063  
Crude Oil [Member] | Midland Differential Basis Swaps [Member] | Derivative Contracts - November through December [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 15,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 1.063  
Crude Oil [Member] | Midland Differential Basis Swaps [Member] | Derivative Contracts Year Two - January through December [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 20,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 1.075  
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts - November through December [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 52,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 3.911  
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts Year Two - January through December [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 10,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 5.558  
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts - January through September (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 37,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 3.818  
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts - October 2018 (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 52,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 3.911  
Crude Oil [Member] | Price Swaps [Member] | Derivative Contracts - January through September (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 134,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 60.04  
Crude Oil [Member] | Price Swaps [Member] | Derivative Contracts - October through December [Member]    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 134,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 60.04  
Natural Gas [Member] | Price Swaps [Member] | Derivative Contracts - March through October (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 3.00  
Volume (MMBtud) | MMBTU 35,000  
Natural Gas [Member] | Price Swaps [Member] | Derivative Contracts - November [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 3.00  
Volume (MMBtud) | MMBTU 35,000  
Natural Gas [Member] | Call Option [Member] | Derivative Contracts - March through October (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 120,000  
Derivative, Average Price Risk Option Strike Price | $ / MMBTU 3.38  
Natural Gas [Member] | Call Option [Member] | Derivative Contracts - November [Member]    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 120,000  
Derivative, Average Price Risk Option Strike Price | $ / MMBTU 3.38  
Natural Gas [Member] | Put Option [Member] | Derivative Contracts - March through October (closed) [Member]    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 96,000  
Derivative, Average Price Risk Option Strike Price | $ / MMBTU 2.94  
Natural Gas [Member] | Put Option [Member] | Derivative Contracts - November [Member]    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 96,000  
Derivative, Average Price Risk Option Strike Price | $ / MMBTU 2.94  
[1] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $161 million, partially offset by gross assets of $28 million at September 30, 2018, and gross liabilities of $55 million, partially offset by gross assets of $5 million at December 31, 2017.