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Derivatives (Current and Noncurrent Derivative Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | $ 22,285 | $ 17,252
Commodity derivative liabilities | 0 | 0
Commodity derivative assets - current | 51,421 | 30,702
Commodity derivative assets - noncurrent | 480 | 310
Commodity derivative liabilities - current | (32,647) | (29,651)
Commodity derivative liabilities - noncurrent | (889) | (825)
Commodity Contract |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 44,658 | 37,730
Commodity derivative liabilities | (41,237) | (38,545)
Cash collateral | 14,944 | 1,351
Total | 18,365 | 536
Commodity Contract | Commodity derivative assets - current |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 43,463 | 36,929
Commodity derivative liabilities | (6,986) | (7,578)
Cash collateral | 14,944 | 1,351
Commodity derivative assets - current | 51,421 | 30,702
Commodity Contract | Commodity derivative assets - noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 484 | 311
Commodity derivative liabilities | (4) | (1)
Cash collateral | 0 | 0
Commodity derivative assets - noncurrent | 480 | 310
Commodity Contract | Commodity derivative liabilities - current |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 706 | 489
Commodity derivative liabilities | (33,353) | (30,140)
Cash collateral | 0 | 0
Commodity derivative liabilities - current | (32,647) | (29,651)
Commodity Contract | Commodity derivative liabilities - noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative assets | 5 | 1
Commodity derivative liabilities | (894) | (826)
Cash collateral | 0 | 0
Commodity derivative liabilities - noncurrent | $ (889) | $ (825)

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