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Risk Management Activities (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
MMBTU
$ / bbl
$ / MMBTU
MBbls
bbl
Dec. 31, 2018
USD ($)
$ / bbl
Dec. 31, 2017
USD ($)
Derivatives, Fair Value [Line Items]      
Assets from Price Risk Management Activities $ 1,299,000 $ 23,806,000  
Liabilities from Price Risk Management Activities $ 20,194,000 $ 0  
Receivable Major Customer Percentage 10.00% 10.00%  
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts $ 180,275,000 $ (165,640,000) $ 19,828,000
Net Cash Received from (Payments for) Settlements of Commodity Derivatives Contracts 231,229,000 (258,906,000) 7,438,000
Derivative Collateral [Abstract]      
Collateral Held on Derivative 0   0
Collateral Had on Derivaitve 0   0
Assets [Member]      
Derivatives, Fair Value [Line Items]      
Assets from Price Risk Management Activities 3,000,000    
Liabilities from Price Risk Management Activities 2,000,000    
Assets [Member] | Price Risk Derivative [Member]      
Derivatives, Fair Value [Line Items]      
Assets from Price Risk Management Activities [1]   1,299,000 23,806,000
Liability [Member]      
Derivatives, Fair Value [Line Items]      
Assets from Price Risk Management Activities 3,000,000    
Liabilities from Price Risk Management Activities $ 23,000,000    
Liabilities From Price Risk Management Activities [Member] | Price Risk Derivative [Member]      
Derivatives, Fair Value [Line Items]      
Liabilities from Price Risk Management Activities [2]   $ 20,194,000 $ 0
Crude Oil [Member] | Midland Differential Basis Swap [Member] | Derivative Contracts - January through December (closed) [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | MBbls 20,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl   1.075  
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts - January through December (closed) [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 13,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 5.572    
Crude Oil [Member] | Price Swap [Member] | Derivative Contracts - April (closed) [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 25,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 60.00    
Crude Oil [Member] | Price Swap [Member] | Derivative Contracts - May through December (closed) [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 150,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 62.50    
Crude Oil [Member] | Price Swap [Member] | Derivative Contracts - Year Two - January through March [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 200,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 59.33    
Crude Oil [Member] | Price Swap [Member] | Derivative Contracts - Year Two - April through June [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 150,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 59.03    
Crude Oil [Member] | Price Swap [Member] | Derivative Contracts - Year Two - July through September [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 50,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 58.32    
Mont Belvieu Propane Price Swap [Member] | Price Swap [Member] | Derivative Contracts - Year Two - January through December [Member]      
Derivatives, Fair Value [Line Items]      
Volume (Bbld) | bbl 4,000    
Derivative, Swap Type, Average Fixed Price | $ / bbl 21.34    
Natural Gas [Member] | Rockies Differential Basis Swaps [Member] | Derivative Contracts - Year Two - January through December [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 0.55    
Volume (MMBTU) | MMBTU 30,000    
Natural Gas [Member] | HSC Differential Basis Swaps [Member] | Derivative Contracts - Year Two - January through December [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 0.05    
Volume (MMBTU) | MMBTU 60,000    
Natural Gas [Member] | Waha Differential Basis Swaps [Member] | Derivative Contracts - Year Two - January through December [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 1.40    
Volume (MMBTU) | MMBTU 50,000    
Natural Gas [Member] | Price Swap [Member] | Derivative Contracts - Year Two - January through December [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 2.90    
Volume (MMBTU) | MMBTU 250,000    
[1]
The current portion of Assets from Price Risk Management Activities consists of gross assets of $3 million, partially offset by gross liabilities of $2 million, at December 31, 2019.
[2]
The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $23 million, partially offset by gross assets of $3 million at December 31, 2019.