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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - Commodity Contracts - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Gross Recognized Derivatives | $ 44,653 | $ 53,356
Amounts Offset | (23,220) | (26,017)
Net Recognized Derivatives | 21,433 | 27,339
Other | 707 | 672
Amount Reported on Balance Sheet | 22,140 | 28,011
Liabilities |  |
Gross Recognized Derivatives | (126,440) | (207,387)
Amounts Offset | 23,220 | 44,077
Net Recognized Derivatives | (103,220) | (163,310)
Other | (4,330) | (4,379)
Amount Reported on Balance Sheet | (107,550) | (167,689)
Assets and Liabilities |  |
Gross Recognized Derivatives | (81,787) | (154,031)
Amounts Offset | 0 | 18,060
Net Recognized Derivatives | (81,787) | (135,971)
Other | (3,623) | (3,707)
Amount Reported on Balance Sheet | (85,410) | (139,678)
Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 30,393 | 37,396
Amounts Offset | (14,424) | (22,163)
Net Recognized Derivatives | 15,969 | 15,233
Other | 707 | 672
Amount Reported on Balance Sheet | 16,676 | 15,905
Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 14,260 | 15,960
Amounts Offset | (8,796) | (3,854)
Net Recognized Derivatives | 5,464 | 12,106
Other | 0 | 0
Amount Reported on Balance Sheet | 5,464 | 12,106
Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (65,432) | (113,560)
Amounts Offset | 14,424 | 40,223
Net Recognized Derivatives | (51,008) | (73,337)
Other | (4,330) | (4,379)
Amount Reported on Balance Sheet | (55,338) | (77,716)
Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (61,008) | (93,827)
Amounts Offset | 8,796 | 3,854
Net Recognized Derivatives | (52,212) | (89,973)
Other | 0 | 0
Amount Reported on Balance Sheet | $ (52,212) | $ (89,973)

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