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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, 2019 USD ($) Boe MMBTU | Dec. 31, 2018 USD ($) Boe MMBTU
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 358,639 | $ 107,816
Derivative liabilities - Fair value | $ 263,734 | $ 118,305
Customer Counterparty | Crude oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 7,166 | 2,507
Customer Counterparty | Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 33,089 | 14,722
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 358,639 | $ 107,816
Derivative liabilities - Fair value | 260,499 | 111,828
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 32,978 | 14,422
Derivative liabilities - Fair value | 41,867 | 23,068
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 4,289 | 1,127
Derivative liabilities - Fair value | $ 36,147 | $ 22,687
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 148 | 524
Derivative assets - Fair value | $ 0 | $ 0
Derivative liabilities - Fair value | $ 305 | $ 2,628
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,838 | 872
Derivative assets - Fair value | $ 19 | $ 0
Derivative liabilities - Fair value | $ 5,523 | $ 3,772
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,180 | 1,111
Derivative assets - Fair value | $ 1,454 | $ 0
Derivative liabilities - Fair value | $ 22,806 | $ 14,278
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 7,166 | 2,507
Derivative assets - Fair value | $ 1,473 | $ 0
Derivative liabilities - Fair value | $ 28,634 | $ 20,678
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Written options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 570 |
Derivative assets - Fair value | $ 0 |
Derivative liabilities - Fair value | $ 42 |
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 10,742 | 3,063
Derivative assets - Fair value | $ 228 | $ 78
Derivative liabilities - Fair value | $ 447 | $ 152
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 21,777 | 11,659
Derivative assets - Fair value | $ 2,588 | $ 1,049
Derivative liabilities - Fair value | $ 7,024 | $ 1,857
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 33,089 | 14,722
Derivative assets - Fair value | $ 2,816 | $ 1,127
Derivative liabilities - Fair value | 7,513 | 2,009
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 28,689 | 13,295
Derivative liabilities - Fair value | $ 5,720 | $ 381
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 148 | 524
Derivative assets - Fair value | $ 225 | $ 2,251
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 | 3,384 | 872
Derivative assets - Fair value | $ 6,141 | $ 3,225
Derivative liabilities - Fair value | $ 713 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 4,299 | 1,111
Derivative assets - Fair value | $ 14,922 | $ 5,799
Derivative liabilities - Fair value | $ 1,939 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 7,831 | 2,507
Derivative assets - Fair value | $ 21,288 | $ 11,275
Derivative liabilities - Fair value | $ 2,652 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Purchased options |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 560 |
Derivative assets - Fair value | $ 35 |
Derivative liabilities - Fair value | $ 0 |
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 10,672 | 3,063
Derivative assets - Fair value | $ 387 | $ 151
Derivative liabilities - Fair value | $ 183 | $ 64
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 22,938 | 11,659
Derivative assets - Fair value | $ 6,979 | $ 1,869
Derivative liabilities - Fair value | $ 2,885 | $ 317
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 34,170 | 14,722
Derivative assets - Fair value | $ 7,401 | $ 2,020
Derivative liabilities - Fair value | $ 3,068 | $ 381

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