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Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) Boe MMBTU | Dec. 31, 2019 USD ($) Boe MMBTU
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 708,610 | $ 330,316
Derivative liabilities - Fair value | $ 506,019 | $ 256,528
Customer Counterparty | Crude oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,100 | 7,811
Customer Counterparty | Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 110,340 | 63,773
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 708,546 | $ 330,316
Derivative liabilities - Fair value | 503,906 | 251,744
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 110,029 | 81,380
Derivative liabilities - Fair value | 118,873 | 80,517
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 49,589 | 40,065
Derivative liabilities - Fair value | $ 75,038 | $ 42,140
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 0 | 36
Derivative assets - Fair value | $ 0 | $ 0
Derivative liabilities - Fair value | $ 0 | $ 30
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,390 | 3,174
Derivative assets - Fair value | $ 18 | $ 2,673
Derivative liabilities - Fair value | $ 12,245 | $ 538
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,710 | 4,601
Derivative assets - Fair value | $ 3,635 | $ 6,949
Derivative liabilities - Fair value | $ 36,622 | $ 5,531
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,100 | 7,811
Derivative assets - Fair value | $ 3,653 | $ 9,622
Derivative liabilities - Fair value | $ 48,867 | $ 6,099
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | 973 | 540
Derivative assets - Fair value | $ 0 | $ 0
Derivative liabilities - Fair value | $ 116 | $ 22
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 14,761 | 14,277
Derivative assets - Fair value | $ 3,705 | $ 186
Derivative liabilities - Fair value | $ 0 | $ 522
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 94,606 | 48,956
Derivative assets - Fair value | $ 42,231 | $ 30,257
Derivative liabilities - Fair value | $ 26,055 | $ 35,497
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 110,340 | 63,773
Derivative assets - Fair value | $ 45,936 | $ 30,443
Derivative liabilities - Fair value | 26,171 | 36,041
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 60,440 | 41,315
Derivative liabilities - Fair value | $ 43,835 | $ 38,377
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 0 | 36
Derivative assets - Fair value | $ 0 | $ 29
Derivative liabilities - Fair value | $ 0 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 1,544 | 3,630
Derivative assets - Fair value | $ 12,946 | $ 677
Derivative liabilities - Fair value | $ 943 | $ 2,815
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,759 | 4,721
Derivative assets - Fair value | $ 21,336 | $ 4,516
Derivative liabilities - Fair value | $ 2,991 | $ 5,215
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,303 | 8,387
Derivative assets - Fair value | $ 34,282 | $ 5,222
Derivative liabilities - Fair value | $ 3,934 | $ 8,030
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | 963 | 530
Derivative assets - Fair value | $ 115 | $ 21
Derivative liabilities - Fair value | $ 0 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 18,111 | 14,517
Derivative assets - Fair value | $ 0 | $ 471
Derivative liabilities - Fair value | $ 3,046 | $ 150
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 102,263 | 48,779
Derivative assets - Fair value | $ 26,043 | $ 35,601
Derivative liabilities - Fair value | $ 36,855 | $ 30,197
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 121,337 | 63,826
Derivative assets - Fair value | $ 26,158 | $ 36,093
Derivative liabilities - Fair value | $ 39,901 | $ 30,347

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