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Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | $ 38,580 | $ 22,285 | $ (18,874)
Commodity derivative liabilities | 0 | 0 | 0
Commodity derivative assets - current | 158,277 | 51,421 | 43,810
Commodity derivative assets - noncurrent | 3,757 | 480 | 1,739
Commodity derivative liabilities - current | (66,623) | (32,647) | (15,424)
Commodity derivative liabilities - noncurrent | (3,821) | (889) | (1,414)
Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 146,801 | 44,658 | 34,874
Commodity derivative liabilities | (76,962) | (41,237) | (60,925)
Cash collateral paid (received) | 21,751 | 14,944 | 54,762
Total | 91,590 | 18,365 | 28,711
Commodity | Commodity Derivative Assets - Current |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 142,262 | 43,463 | 29,861
Commodity derivative liabilities | (5,736) | (6,986) | (40,813)
Cash collateral paid (received) | 21,751 | 14,944 | 54,762
Commodity derivative assets - current | 158,277 | 51,421 | 43,810
Commodity | Commodity Derivative Assets - Noncurrent |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 3,781 | 484 | 1,851
Commodity derivative liabilities | (24) | (4) | (112)
Cash collateral paid (received) | 0 | 0 | 0
Commodity derivative assets - noncurrent | 3,757 | 480 | 1,739
Commodity | Commodity Derivative Liabilities - Current |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 665 | 706 | 3,115
Commodity derivative liabilities | (67,288) | (33,353) | (18,539)
Cash collateral paid (received) | 0 | 0 | 0
Commodity derivative liabilities - current | (66,623) | (32,647) | (15,424)
Commodity | Commodity Derivative Liabilities - Noncurrent |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 93 | 5 | 47
Commodity derivative liabilities | (3,914) | (894) | (1,461)
Cash collateral paid (received) | 0 | 0 | 0
Commodity derivative liabilities - noncurrent | $ (3,821) | $ (889) | $ (1,414)

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