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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, 2020 USD ($) MMBTU Boe | Mar. 31, 2019 MMBTU Boe | Dec. 31, 2019 USD ($) MMBTU Boe
Derivative [Line Items] |  |  |
Derivative assets - Fair value | $ 834,204 |  | $ 330,316
Derivative liabilities - Fair value | $ 658,515 |  | $ 256,528
Customer Counterparty | Crude oil |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 6,738 |  | 7,811
Customer Counterparty | Natural gas |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 61,296 |  | 63,773
Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | $ 834,131 |  | $ 330,316
Derivative liabilities - Fair value | 657,340 |  | 251,744
Derivatives not designated as hedging instruments | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 163,563 |  | 81,380
Derivative liabilities - Fair value | 199,288 |  | 80,517
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 27,134 |  | 40,065
Derivative liabilities - Fair value | $ 167,127 |  | 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 | 24 | 36 |
Derivative assets - Fair value | $ 0 |  | 0
Derivative liabilities - Fair value | $ 681 |  | 30
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,522 | 3,174 |
Derivative assets - Fair value | $ 13 |  | 2,673
Derivative liabilities - Fair value | $ 46,210 |  | 538
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,192 | 4,601 |
Derivative assets - Fair value | $ 789 |  | 6,949
Derivative liabilities - Fair value | $ 87,097 |  | 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 | 6,738 | 7,811 |
Derivative assets - Fair value | $ 802 |  | 9,622
Derivative liabilities - Fair value | $ 133,988 |  | 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 | 420 | 540 |
Derivative assets - Fair value | $ 0 |  | 0
Derivative liabilities - Fair value | $ 43 |  | 22
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 14,201 | 14,277 |
Derivative assets - Fair value | $ 541 |  | 186
Derivative liabilities - Fair value | $ 1,364 |  | 522
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 46,675 | 48,956 |
Derivative assets - Fair value | $ 25,791 |  | 30,257
Derivative liabilities - Fair value | $ 31,732 |  | 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 | 61,296 | 63,773 |
Derivative assets - Fair value | $ 26,332 |  | 30,443
Derivative liabilities - Fair value | 33,139 |  | 36,041
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 136,429 |  | 41,315
Derivative liabilities - Fair value | $ 32,161 |  | 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 | 24 | 36 |
Derivative assets - Fair value | $ 681 |  | 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 | 2,859 | 3,630 |
Derivative assets - Fair value | $ 49,546 |  | 677
Derivative liabilities - Fair value | $ 3,732 |  | 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 | 4,294 | 4,721 |
Derivative assets - Fair value | $ 54,366 |  | 4,516
Derivative liabilities - Fair value | $ 2,408 |  | 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 | 7,177 | 8,387 |
Derivative assets - Fair value | $ 104,593 |  | 5,222
Derivative liabilities - Fair value | $ 6,140 |  | 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 | 410 | 530 |
Derivative assets - Fair value | $ 22 |  | 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 | 14,291 | 14,517 |
Derivative assets - Fair value | $ 996 |  | 471
Derivative liabilities - Fair value | $ 403 |  | 150
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 46,500 | 48,779 |
Derivative assets - Fair value | $ 30,818 |  | 35,601
Derivative liabilities - Fair value | $ 25,618 |  | 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 | 61,201 | 63,826 |
Derivative assets - Fair value | $ 31,836 |  | 36,093
Derivative liabilities - Fair value | $ 26,021 |  | $ 30,347

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