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Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) MMBTU Boe | Dec. 31, 2020 USD ($) Boe MMBTU
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 588,582 | $ 602,754
Derivative liabilities - Fair value | $ 448,921 | $ 424,828
Customer Counterparty | Crude oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 8,484 | 6,321
Customer Counterparty | Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 119,921 | 109,635
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 588,582 | $ 602,754
Derivative liabilities - Fair value | 447,542 | 422,729
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 228,536 | 82,451
Derivative liabilities - Fair value | 199,327 | 84,165
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 203,288 | 44,762
Derivative liabilities - Fair value | $ 25,224 | $ 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 | 210 |
Derivative assets - Fair value | $ 288 |
Derivative liabilities - Fair value | $ 2 |
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,406 | 2,022
Derivative assets - Fair value | $ 28,308 | $ 2,344
Derivative liabilities - Fair value | $ 35 | $ 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 | 5,868 | 4,299
Derivative assets - Fair value | $ 92,924 | $ 9,282
Derivative liabilities - Fair value | $ 27 | $ 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 | 8,484 | 6,321
Derivative assets - Fair value | $ 121,520 | $ 11,626
Derivative liabilities - Fair value | $ 64 | $ 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 | 5,336 | 597
Derivative assets - Fair value | $ 3 | $ 0
Derivative liabilities - Fair value | $ 16 | $ 59
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 18,178 | 12,733
Derivative assets - Fair value | $ 9,327 | $ 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 | 96,407 | 96,305
Derivative assets - Fair value | $ 72,438 | $ 32,073
Derivative liabilities - Fair value | $ 25,144 | $ 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 | 119,921 | 109,635
Derivative assets - Fair value | $ 81,768 | $ 33,136
Derivative liabilities - Fair value | 25,160 | 27,502
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 25,248 | 37,689
Derivative liabilities - Fair value | $ 174,103 | $ 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 | 210 |
Derivative assets - Fair value | $ 0 |
Derivative liabilities - Fair value | $ 241 |
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,406 | 2,022
Derivative assets - Fair value | $ 35 | $ 2,217
Derivative liabilities - Fair value | $ 27,811 | $ 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 | 5,868 | 4,299
Derivative assets - Fair value | $ 60 | $ 8,220
Derivative liabilities - Fair value | $ 76,813 | $ 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 | 8,484 | 6,321
Derivative assets - Fair value | $ 95 | $ 10,437
Derivative liabilities - Fair value | $ 104,865 | $ 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 | 5,336 | 597
Derivative assets - Fair value | $ 16 | $ 59
Derivative liabilities - Fair value | $ 3 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 23,468 | 16,293
Derivative assets - Fair value | $ 0 | $ 205
Derivative liabilities - Fair value | $ 7,879 | $ 813
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 103,653 | 103,973
Derivative assets - Fair value | $ 25,137 | $ 26,988
Derivative liabilities - Fair value | $ 61,356 | $ 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 | 132,457 | 120,863
Derivative assets - Fair value | $ 25,153 | $ 27,252
Derivative liabilities - Fair value | $ 69,238 | $ 30,650

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