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Derivatives (Details 1) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | $ (999) | $ 1,599 | $ 16,258
Commodity derivative liabilities | 0 | 0 | 0
Commodity derivative assets - current | 45,202 | 45,447 | 59,837
Commodity derivative assets - noncurrent | 245 | 100 | 1,346
Commodity derivative liabilities - current | (38,578) | (23,167) | (59,770)
Commodity derivative liabilities - noncurrent | (902) | (339) | (1,954)
Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 34,842 | 37,739 | 65,104
Commodity derivative liabilities | (56,612) | (43,971) | (79,003)
Cash collateral | 27,737 | 28,273 | 13,358
Total | 5,967 | 22,041 | (541)
Commodity Derivative Assets - Current | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 33,804 | 36,146 | 60,372
Commodity derivative liabilities | (16,339) | (18,972) | (13,893)
Cash collateral | 27,737 | 28,273 | 13,358
Commodity derivative assets - current | 45,202 | 45,447 | 59,837
Commodity Derivative Assets - Noncurrent | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 288 | 140 | 1,356
Commodity derivative liabilities | (43) | (40) | (10)
Cash collateral | 0 | 0 | 0
Commodity derivative assets - noncurrent | 245 | 100 | 1,346
Commodity Derivative Liabilities - Current | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 676 | 1,447 | 3,318
Commodity derivative liabilities | (39,254) | (24,614) | (63,088)
Cash collateral | 0 | 0 | 0
Commodity derivative liabilities - current | (38,578) | (23,167) | (59,770)
Commodity Derivative Liabilities - Noncurrent | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 74 | 6 | 58
Commodity derivative liabilities | (976) | (345) | (2,012)
Cash collateral | 0 | 0 | 0
Commodity derivative liabilities - noncurrent | $ (902) | $ (339) | $ (1,954)

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