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Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | $ (5,996) | $ 22,285 | $ 68,244
Commodity derivative liabilities | 0 | 0 | 0
Commodity derivative assets - current | 233,015 | 51,421 | 54,259
Commodity derivative assets - noncurrent | 6,161 | 480 | 1,008
Commodity derivative liabilities - current | (69,369) | (32,647) | (85,160)
Commodity derivative liabilities - noncurrent | (3,985) | (889) | (3,202)
Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 176,817 | 44,658 | 125,601
Commodity derivative liabilities | (120,341) | (41,237) | (105,808)
Cash collateral paid (received) | 109,346 | 14,944 |
Cash collateral (received) |  |  | (52,888)
Total | 165,822 | 18,365 | (33,095)
Commodity | Commodity Derivative Assets - Current |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 166,652 | 43,463 | 123,917
Commodity derivative liabilities | (42,983) | (6,986) | (16,770)
Cash collateral paid (received) | 109,346 | 14,944 |
Cash collateral (received) |  |  | (52,888)
Commodity derivative assets - current | 233,015 | 51,421 | 54,259
Commodity | Commodity Derivative Assets - Noncurrent |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 6,748 | 484 | 1,022
Commodity derivative liabilities | (587) | (4) | (14)
Cash collateral paid (received) | 0 | 0 |
Cash collateral (received) |  |  | 0
Commodity derivative assets - noncurrent | 6,161 | 480 | 1,008
Commodity | Commodity Derivative Liabilities - Current |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 3,360 | 706 | 626
Commodity derivative liabilities | (72,729) | (33,353) | (85,786)
Cash collateral paid (received) | 0 | 0 |
Cash collateral (received) |  |  | 0
Commodity derivative liabilities - current | (69,369) | (32,647) | (85,160)
Commodity | Commodity Derivative Liabilities - Noncurrent |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 57 | 5 | 36
Commodity derivative liabilities | (4,042) | (894) | (3,238)
Cash collateral paid (received) | 0 | 0 |
Cash collateral (received) |  |  | 0
Commodity derivative liabilities - noncurrent | $ (3,985) | $ (889) | $ (3,202)

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