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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, 2019 USD ($) MMBTU Boe | Dec. 31, 2018 USD ($) MMBTU Boe
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 242,876 | $ 107,816
Derivative liabilities - Fair value | $ 172,923 | $ 118,305
Crude oil |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 5,646 | 2,507
Natural gas |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 30,775 | 14,722
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 242,824 | $ 107,816
Derivative liabilities - Fair value | 169,904 | 111,828
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 22,651 | 14,422
Derivative liabilities - Fair value | 25,906 | 23,068
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 6,004 | 1,127
Derivative liabilities - Fair value | $ 18,802 | $ 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 | 134 | 524
Derivative assets - Fair value | $ 231 | $ 0
Derivative liabilities - Fair value | $ 286 | $ 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 | 2,082 | 872
Derivative assets - Fair value | $ 752 | $ 0
Derivative liabilities - Fair value | $ 1,506 | $ 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 | 3,430 | 1,111
Derivative assets - Fair value | $ 1,985 | $ 0
Derivative liabilities - Fair value | $ 10,167 | $ 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 | 5,646 | 2,507
Derivative assets - Fair value | $ 2,968 | $ 0
Derivative liabilities - Fair value | $ 11,959 | $ 20,678
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 6,385 | 3,063
Derivative assets - Fair value | $ 9 | $ 78
Derivative liabilities - Fair value | $ 431 | $ 152
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 24,390 | 11,659
Derivative assets - Fair value | $ 3,027 | $ 1,049
Derivative liabilities - Fair value | $ 6,412 | $ 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 | 30,775 | 14,722
Derivative assets - Fair value | $ 3,036 | $ 1,127
Derivative liabilities - Fair value | 6,843 | 2,009
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative assets - Fair value | 16,647 | 13,295
Derivative liabilities - Fair value | $ 7,104 | $ 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 | 134 | 524
Derivative assets - Fair value | $ 189 | $ 2,251
Derivative liabilities - Fair value | $ 222 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 2,697 | 872
Derivative assets - Fair value | $ 1,752 | $ 3,225
Derivative liabilities - Fair value | $ 1,069 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 3,551 | 1,111
Derivative assets - Fair value | $ 7,622 | $ 5,799
Derivative liabilities - Fair value | $ 2,180 | $ 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 | 6,382 | 2,507
Derivative assets - Fair value | $ 9,563 | $ 11,275
Derivative liabilities - Fair value | $ 3,471 | $ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 6,315 | 3,063
Derivative assets - Fair value | $ 372 | $ 151
Derivative liabilities - Fair value | $ 9 | $ 64
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 26,807 | 11,659
Derivative assets - Fair value | $ 6,712 | $ 1,869
Derivative liabilities - Fair value | $ 3,624 | $ 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 | 33,122 | 14,722
Derivative assets - Fair value | $ 7,084 | $ 2,020
Derivative liabilities - Fair value | $ 3,633 | $ 381

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