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Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative liabilities | $ (14,100) | $ (157,301) | $ (58,495)
Commodity derivative assets - current | 409,647 | 320,706 | 140,065
Commodity derivative liabilities - current | (78,702) | (146,990) | (79,159)
Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 419,591 | 328,261 | 170,483
Commodity derivative liabilities | (221,473) | (359,464) | (177,413)
Cash collateral paid | 136,977 | 208,670 |
Cash collateral paid |  |  | 70,446
Total | 335,095 | 177,467 | 63,516
Commodity | Commodity Derivative Assets - Current |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 380,391 | 304,533 | 159,553
Commodity derivative liabilities | (107,721) | (192,023) | (89,933)
Cash collateral paid | 136,977 | 208,196 |
Cash collateral paid |  |  | 70,446
Commodity derivative assets - current | 409,647 | 320,706 | 140,066
Commodity | Commodity Derivative Assets - Noncurrent |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 11,704 | 4,328 | 3,565
Commodity derivative liabilities | (370) | (348) | (508)
Cash collateral paid | 0 | 0 |
Cash collateral paid |  |  | 0
Commodity derivative assets - noncurrent | 11,334 | 3,980 | 3,057
Commodity | Commodity Derivative Liabilities - Current |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 27,035 | 19,386 | 7,323
Commodity derivative liabilities | (105,737) | (166,850) | (86,482)
Cash collateral paid | 0 | 474 |
Cash collateral paid |  |  | 0
Commodity derivative liabilities - current | (78,702) | (146,990) | (79,159)
Commodity | Commodity Derivative Liabilities - Noncurrent |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 461 | 14 | 42
Commodity derivative liabilities | (7,645) | (243) | (490)
Cash collateral paid | 0 | 0 |
Cash collateral paid |  |  | 0
Commodity derivative liabilities - noncurrent | $ (7,184) | $ (229) | $ (448)

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