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Derivatives (Details 1) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | $ 13,491 | $ 25,356 | $ 0
Commodity derivative liabilities | (1,480) | 0 | 58,195
Commodity derivative assets - current | 115,924 | 49,826 | 39,860
Commodity derivative assets - noncurrent | 1,934 | 412 | 2,990
Commodity derivative liabilities - current | (43,183) | (37,387) | (42,622)
Commodity derivative liabilities - noncurrent | (2,182) | (1,063) | (2,177)
Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 142,608 | 52,432 | 59,476
Commodity derivative liabilities | (107,887) | (43,652) | (110,432)
Cash collateral | 37,772 | 3,008 | 49,007
Total | 72,493 | 11,788 | (1,949)
Commodity derivative assets - current | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 134,504 | 51,647 | 52,405
Commodity derivative liabilities | (56,832) | (4,829) | (61,552)
Cash collateral | 38,252 | 3,008 | 49,007
Commodity derivative assets - current | 115,924 | 49,826 | 39,860
Commodity derivative assets - noncurrent | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 2,095 | 412 | 3,072
Commodity derivative liabilities | (161) | 0 | (82)
Cash collateral | 0 | 0 | 0
Commodity derivative assets - noncurrent | 1,934 | 412 | 2,990
Commodity derivative liabilities - current | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 5,925 | 371 | 3,956
Commodity derivative liabilities | (48,628) | (37,758) | (46,578)
Cash collateral | (480) | 0 | 0
Commodity derivative liabilities - current | (43,183) | (37,387) | (42,622)
Commodity derivative liabilities - noncurrent | Commodity |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative assets | 84 | 2 | 43
Commodity derivative liabilities | (2,266) | (1,065) | (2,220)
Cash collateral | 0 | 0 | 0
Commodity derivative liabilities - noncurrent | $ (2,182) | $ (1,063) | $ (2,177)

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