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Commitments and Contingencies - Future Delivery Commitments (Detail) | 12 Months Ended
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Dec. 31, 2017 MMBTU / d bbl / d
2018 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 382,534
2018 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 71,000
2019 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 364,356
2019 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 55,932
2020 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 252,878
2020 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 48,625
2021 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 116,189
2021 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 48,000
2022 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 68,712
2022 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 43,000
2023 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 0
2023 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 35,000
2024 - 2028 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 0
2024 - 2028 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 35,000
2029 - 2031 | Natural Gas |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | MMBTU / d | 0
2029 - 2031 | Ethane and Propane |
Commitments And Contingencies Disclosure [Line Items] |
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d | 20,000

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