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Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | $ 68,244 | $ 17,252 | $ (12,835)
Commodity derivative liabilities | 0 | 0 | 0
Commodity derivative assets - current | 54,259 | 30,702 | 11,619
Commodity derivative assets - noncurrent | 1,008 | 310 | 1,191
Commodity derivative liabilities - current | (85,160) | (29,651) | (18,104)
Commodity derivative liabilities - noncurrent | (3,202) | (825) | (334)
Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 125,601 | 37,730 | 31,708
Commodity derivative liabilities | (105,808) | (38,545) | (52,788)
Cash collateral | (52,888) | 1,351 | 15,452
Total | (33,095) | 536 | (5,628)
Commodity Derivative Assets - Current | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 123,917 | 36,929 | 26,101
Commodity derivative liabilities | (16,770) | (7,578) | (29,934)
Cash collateral | (52,888) | 1,351 | 15,452
Commodity derivative assets - current | 54,259 | 30,702 | 11,619
Commodity Derivative Assets - Noncurrent | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 1,022 | 311 | 1,201
Commodity derivative liabilities | (14) | (1) | (10)
Cash collateral | 0 | 0 | 0
Commodity derivative assets - noncurrent | 1,008 | 310 | 1,191
Commodity Derivative Liabilities - Current | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 626 | 489 | 4,404
Commodity derivative liabilities | (85,786) | (30,140) | (22,508)
Cash collateral | 0 | 0 | 0
Commodity derivative liabilities - current | (85,160) | (29,651) | (18,104)
Commodity Derivative Liabilities - Noncurrent | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 36 | 1 | 2
Commodity derivative liabilities | (3,238) | (826) | (336)
Cash collateral | 0 | 0 | 0
Commodity derivative liabilities - noncurrent | $ (3,202) | $ (825) | $ (334)

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