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Derivative Accounting - Derivative Instruments in the Balance Sheet (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Commodity Contracts |  |
Assets |  |
Gross Recognized Derivatives | $ 54,798,000 | $ 53,356,000
Amounts Offset | (35,103,000) | (26,017,000)
Net Recognized Derivatives | 19,695,000 | 27,339,000
Other | 0 | 672,000
Amount Reported on Balance Sheet | 19,695,000 | 28,011,000
Liabilities |  |
Gross Recognized Derivatives | (104,123,000) | (207,387,000)
Amounts Offset | 35,103,000 | 44,077,000
Net Recognized Derivatives | (69,020,000) | (163,310,000)
Other | (4,054,000) | (4,379,000)
Amount Reported on Balance Sheet | (73,074,000) | (167,689,000)
Assets and Liabilities |  |
Gross Recognized Derivatives | (49,325,000) | (154,031,000)
Amounts Offset | 0 | 18,060,000
Net Recognized Derivatives | (49,325,000) | (135,971,000)
Other | (4,054,000) | (3,707,000)
Amount Reported on Balance Sheet | (53,379,000) | (139,678,000)
Commodity Contracts | Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 48,094,000 | 37,396,000
Amounts Offset | (28,400,000) | (22,163,000)
Net Recognized Derivatives | 19,694,000 | 15,233,000
Other | 0 | 672,000
Amount Reported on Balance Sheet | 19,694,000 | 15,905,000
Commodity Contracts | Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 6,704,000 | 15,960,000
Amounts Offset | (6,703,000) | (3,854,000)
Net Recognized Derivatives | 1,000 | 12,106,000
Other | 0 | 0
Amount Reported on Balance Sheet | 1,000 | 12,106,000
Commodity Contracts | Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (50,182,000) | (113,560,000)
Amounts Offset | 28,400,000 | 40,223,000
Net Recognized Derivatives | (21,782,000) | (73,337,000)
Other | (4,054,000) | (4,379,000)
Amount Reported on Balance Sheet | (25,836,000) | (77,716,000)
Commodity Contracts | Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (53,941,000) | (93,827,000)
Amounts Offset | 6,703,000 | 3,854,000
Net Recognized Derivatives | (47,238,000) | (89,973,000)
Other | 0 | 0
Amount Reported on Balance Sheet | (47,238,000) | (89,973,000)
Designated as Hedging Instruments |  |
Liabilities |  |
Amount Reported on Balance Sheet | $ (2,000,000) | $ (3,000,000)

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