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Risk Management Activities (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
MMBTU
$ / MMBTU
$ / bbl
bbl
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 50,000  
Weighted Average Price (MMBtu) 1.40  
Assets from Price Risk Management Activities | $ $ 207,019 $ 1,299
Liabilities from Price Risk Management Activities | $ 0 20,194
Other Assets | $ 2,000  
Derivative Collateral [Abstract]    
Collateral Had on Derivative | $ 0 0
Collateral Held on Derivative | $ 62,000 0
Price Risk Derivative    
Derivatives, Fair Value [Line Items]    
Other Assets | $ 1,569 0
Assets From Price Risk Management Activities    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities | $ 239,000 3,000
Liabilities from Price Risk Management Activities | $ 32,000 2,000
Assets From Price Risk Management Activities | Price Risk Derivative    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities | $ [1] 207,019 1,299
Liabilities From Price Risk Management Activities    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities | $   3,000
Liabilities from Price Risk Management Activities | $   23,000
Liabilities From Price Risk Management Activities | Price Risk Derivative    
Derivatives, Fair Value [Line Items]    
Liabilities from Price Risk Management Activities | $ [2] 0 $ 20,194
Crude Oil | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Cash Expected to Receive or Pay From Offsetting Contract | $ 3,200  
Crude Oil | Price Swaps    
Derivatives, Fair Value [Line Items]    
Cash Expected to Receive or Pay From Offsetting Contract | $ $ 364,000  
Crude Oil | Derivative Contracts - May (closed) | ICE Brent Differential Basis Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 10,000  
Weighted Average Price ($/Bbl) (4.92)  
Crude Oil | Derivative Contracts - May (closed) | Houston Differential Basis Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 10,000  
Weighted Average Price ($/Bbl) (1.55)  
Crude Oil | Derivative Contracts - February through June (closed) | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 10,000  
Weighted Average Price ($/Bbl) (0.70)  
Crude Oil | Derivative Contracts - July (closed) | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 88,000  
Weighted Average Price ($/Bbl) (1.16)  
Crude Oil | Derivative Contracts - August through September | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 88,000  
Weighted Average Price ($/Bbl) (1.16)  
Crude Oil | Derivative Contracts - August through September | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 154,000  
Weighted Average Price ($/Bbl) (50.42)  
Crude Oil | Derivative Contracts - October through December | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 66,000  
Weighted Average Price ($/Bbl) (1.16)  
Crude Oil | Derivative Contracts - October through December | Price Swaps    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) (31.00)  
Crude Oil | Derivative Contracts - April through May (closed) | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 265,000  
Weighted Average Price ($/Bbl) (51.36)  
Crude Oil | Derivative Contracts - January through March (closed) | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 200,000  
Weighted Average Price ($/Bbl) (59.33)  
Crude Oil | OffSetting Derivative Contracts - July through September | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 22,000  
Weighted Average Price ($/Bbl) (0.43)  
Crude Oil | OffSetting Derivative Contracts - June | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 265,000  
Weighted Average Price ($/Bbl) (33.80)  
Crude Oil | OffSetting Derivative Contracts - July | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 254,000  
Weighted Average Price ($/Bbl) (33.75)  
Crude Oil | OffSetting Derivative Contracts - August through September | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 154,000  
Weighted Average Price ($/Bbl) (34.18)  
Crude Oil | Derivative Contacts - April (closed) | ICE Brent Price Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 75,000  
Weighted Average Price ($/Bbl) (25.66)  
Crude Oil | Derivative Contacts - May (closed) | ICE Brent Price Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 35,000  
Weighted Average Price ($/Bbl) (26.53)  
Crude Oil | OffSetting Derivative Contracts - October through December | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 44,000  
Weighted Average Price ($/Bbl) (0.73)  
Crude Oil | OffSetting Derivative Contracts - October through December | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 47,000  
Weighted Average Price ($/Bbl) (30.04)  
Crude Oil | Derivative Contracts - June [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 265,000  
Weighted Average Price ($/Bbl) (51.36)  
Crude Oil | Derivative Contracts - July [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 254,000  
Weighted Average Price ($/Bbl) (42.36)  
Crude Oil | Derivative Contracts - July through September [Member] | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 22,000  
Weighted Average Price ($/Bbl) (1.16)  
Crude Oil | New Derivative Contracts - October through December [Member] | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 44,000  
Crude Oil | New Derivative Contracts - October through December [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 47,000  
Natural Gas Liquids | Mont Belvieu Propane Price Swap    
Derivatives, Fair Value [Line Items]    
Cash Expected to Receive or Pay From Offsetting Contract | $ $ 9,200  
Natural Gas Liquids | Derivative Contracts - January through February (closed) | Mont Belvieu Propane Price Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 4,000  
Weighted Average Price ($/Bbl) (21.34)  
Natural Gas Liquids | Derivative Contracts - May through December | Mont Belvieu Propane Price Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 25,000  
Weighted Average Price ($/Bbl) (17.92)  
Natural Gas Liquids | Offsetting Derivative Contracts - May through December [Member] | Mont Belvieu Propane Price Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 25,000  
Weighted Average Price ($/Bbl) (16.41)  
Natural Gas Liquids | Derivative Contracts - March through April (closed) | Mont Belvieu Propane Price Swap    
Derivatives, Fair Value [Line Items]    
Volume (Bbld) | bbl 25,000  
Weighted Average Price ($/Bbl) (17.92)  
Natural Gas | Collars    
Derivatives, Fair Value [Line Items]    
Cash Expected to Receive or Pay From Offsetting Contract | $ $ 1,100  
Natural Gas | Waha Differential Basis Swaps    
Derivatives, Fair Value [Line Items]    
Cash Expected to Receive or Pay From Offsetting Contract | $ $ 11,900  
Natural Gas | Derivative Contracts - April through December (closed) | HSC Differential Basis Swaps    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) | $ / MMBTU (0.05)  
Volume (MMBtud) | MMBTU 60,000  
Cash Paid For Early Termination Of Contracts | $ $ 400  
Natural Gas | Derivative Contracts - January through December (closed) | HSC Differential Basis Swaps    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) | $ / MMBTU (0.05)  
Volume (MMBtud) | MMBTU 60,000  
Natural Gas | Derivative Contracts - April through July (closed) | Collars    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 250,000  
Weighted Average Price (MMBtu) | $ / MMBTU 2.50  
Weighted Average Floor Price (MMBtu) | $ / MMBTU 2.00  
Cash Received For Early Termination Of Contracts | $ $ 7,800  
Natural Gas | Derivative Contracts - January through April (closed) | Waha Differential Basis Swaps    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) | $ / MMBTU (1.40)  
Volume (MMBtud) | MMBTU 50,000  
Natural Gas | Derivative Contracts - August through October | Collars    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 250,000  
Weighted Average Price (MMBtu) | $ / MMBTU 2.50  
Weighted Average Floor Price (MMBtu) | $ / MMBTU 2.00  
Natural Gas | Derivative Contracts - January through June (closed) | Rockies Differential Basis Swap    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) | $ / MMBTU (0.55)  
Volume (MMBtud) | MMBTU 30,000  
Natural Gas | Derivative Contracts - July though December | Rockies Differential Basis Swap    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) | $ / MMBTU (0.55)  
Volume (MMBtud) | MMBTU 30,000  
Natural Gas | Offsetting Derivative Contracts - May through December [Member] | Waha Differential Basis Swaps    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) | $ / MMBTU (0.43)  
Volume (MMBtud) | MMBTU 50,000  
Natural Gas | Offsetting Derivative Contracts - August through October [Member] | Collars    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 250,000  
Weighted Average Price (MMBtu) | $ / MMBTU 2.50  
Weighted Average Floor Price (MMBtu) | $ / MMBTU 2.00  
Natural Gas | Derivative Contracts - Year Two | Price Swaps    
Derivatives, Fair Value [Line Items]    
Weighted Average Price ($/Bbl) (2.75)  
Volume (MMBtud) | MMBTU 50,000  
[1] The current portion of Assets from Price Risk Management Activities consists of gross assets of $239 million, partially offset by gross liabilities of $32 million at June 30, 2020. 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.