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Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Boe MMBTU | Dec. 31, 2020 USD ($) MMBTU Boe
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 457,317 | $ 602,754
Derivative liabilities - Fair value | $ 344,135 | $ 424,828
Customer Counterparty | Crude oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 8,258 | 6,321
Customer Counterparty | Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 102,996 | 109,635
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 456,409 | $ 602,754
Derivative liabilities - Fair value | 342,877 | 422,729
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 98,429 | 82,451
Derivative liabilities - Fair value | 86,405 | 84,165
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 78,277 | 44,762
Derivative liabilities - Fair value | $ 20,218 | $ 43,978
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 248 |
Derivative assets - Fair value | $ 211 |
Derivative liabilities - Fair value | $ 25 |
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,361 | 2,022
Derivative assets - Fair value | $ 11,181 | $ 2,344
Derivative liabilities - Fair value | $ 219 | $ 2,193
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 5,649 | 4,299
Derivative assets - Fair value | $ 37,076 | $ 9,282
Derivative liabilities - Fair value | $ 1,206 | $ 14,283
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 8,258 | 6,321
Derivative assets - Fair value | $ 48,468 | $ 11,626
Derivative liabilities - Fair value | $ 1,450 | $ 16,476
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 8,065 | 597
Derivative assets - Fair value | $ 52 | $ 0
Derivative liabilities - Fair value | $ 319 | $ 59
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 10,823 | 12,733
Derivative assets - Fair value | $ 879 | $ 1,063
Derivative liabilities - Fair value | $ 0 | $ 205
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 84,108 | 96,305
Derivative assets - Fair value | $ 28,878 | $ 32,073
Derivative liabilities - Fair value | $ 18,449 | $ 27,238
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 102,996 | 109,635
Derivative assets - Fair value | $ 29,809 | $ 33,136
Derivative liabilities - Fair value | 18,768 | 27,502
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 20,152 | 37,689
Derivative liabilities - Fair value | $ 66,187 | $ 40,187
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 248 |
Derivative assets - Fair value | $ 0 |
Derivative liabilities - Fair value | $ 48 |
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,361 | 2,022
Derivative assets - Fair value | $ 219 | $ 2,217
Derivative liabilities - Fair value | $ 10,989 | $ 2,402
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 5,649 | 4,299
Derivative assets - Fair value | $ 1,058 | $ 8,220
Derivative liabilities - Fair value | $ 28,624 | $ 7,135
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 8,258 | 6,321
Derivative assets - Fair value | $ 1,277 | $ 10,437
Derivative liabilities - Fair value | $ 39,661 | $ 9,537
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 8,065 | 597
Derivative assets - Fair value | $ 319 | $ 59
Derivative liabilities - Fair value | $ 52 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 14,023 | 16,293
Derivative assets - Fair value | $ 0 | $ 205
Derivative liabilities - Fair value | $ 555 | $ 813
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 91,790 | 103,973
Derivative assets - Fair value | $ 18,556 | $ 26,988
Derivative liabilities - Fair value | $ 25,919 | $ 29,837
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 113,878 | 120,863
Derivative assets - Fair value | $ 18,875 | $ 27,252
Derivative liabilities - Fair value | $ 26,526 | $ 30,650

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