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Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) MMBTU Boe | Dec. 31, 2018 USD ($) MMBTU Boe
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 330,316 | $ 107,816
Derivative liabilities - Fair Value | $ 256,528 | $ 118,305
Customer Counterparty | Crude Oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 7,811 | 2,507
Customer Counterparty | Natural Gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 63,773 | 14,722
Derivative instruments not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 330,316 | $ 107,816
Derivative liabilities - Fair Value | 251,744 | 111,828
Derivative instruments not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 81,380 | 14,422
Derivative liabilities - Fair Value | 80,517 | 23,068
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 40,065 | 1,127
Derivative liabilities - Fair Value | $ 42,140 | $ 22,687
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 36 | 524
Derivative assets - Fair value | $ 0 | $ 0
Derivative liabilities - Fair Value | $ 30 | $ 2,628
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 3,174 | 872
Derivative assets - Fair value | $ 2,673 | $ 0
Derivative liabilities - Fair Value | $ 538 | $ 3,772
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,601 | 1,111
Derivative assets - Fair value | $ 6,949 | $ 0
Derivative liabilities - Fair Value | $ 5,531 | $ 14,278
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Crude Oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 7,811 | 2,507
Derivative assets - Fair value | $ 9,622 | $ 0
Derivative liabilities - Fair Value | $ 6,099 | $ 20,678
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 540 |
Derivative assets - Fair value | $ 0 |
Derivative liabilities - Fair Value | $ 22 |
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 14,277 | 3,063
Derivative assets - Fair value | $ 186 | $ 78
Derivative liabilities - Fair Value | $ 522 | $ 152
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 48,956 | 11,659
Derivative assets - Fair value | $ 30,257 | $ 1,049
Derivative liabilities - Fair Value | $ 35,497 | $ 1,857
Commodity contracts | Derivative instruments not designated as hedging instruments | Customer Counterparty | Natural Gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 63,773 | 14,722
Derivative assets - Fair value | $ 30,443 | $ 1,127
Derivative liabilities - Fair Value | 36,041 | 2,009
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 41,315 | 13,295
Derivative liabilities - Fair Value | $ 38,377 | $ 381
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 36 | 524
Derivative assets - Fair value | $ 29 | $ 2,251
Derivative liabilities - Fair Value | $ 0 | $ 0
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 3,630 | 872
Derivative assets - Fair value | $ 677 | $ 3,225
Derivative liabilities - Fair Value | $ 2,815 | $ 0
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,721 | 1,111
Derivative assets - Fair value | $ 4,516 | $ 5,799
Derivative liabilities - Fair Value | $ 5,215 | $ 0
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Crude Oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 8,387 | 2,507
Derivative assets - Fair value | $ 5,222 | $ 11,275
Derivative liabilities - Fair Value | $ 8,030 | $ 0
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 530 |
Derivative assets - Fair value | $ 21 |
Derivative liabilities - Fair Value | $ 0 |
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 14,517 | 3,063
Derivative assets - Fair value | $ 471 | $ 151
Derivative liabilities - Fair Value | $ 150 | $ 64
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 48,779 | 11,659
Derivative assets - Fair value | $ 35,601 | $ 1,869
Derivative liabilities - Fair Value | $ 30,197 | $ 317
Commodity contracts | Derivative instruments not designated as hedging instruments | Financial Counterparty | Natural Gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 63,826 | 14,722
Derivative assets - Fair value | $ 36,093 | $ 2,020
Derivative liabilities - Fair Value | $ 30,347 | $ 381

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