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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - Commodity Contracts - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Gross Recognized Derivatives | $ 29,040,000 | $ 53,356,000
Amounts Offset | (22,962,000) | (26,017,000)
Net Recognized Derivatives | 6,078,000 | 27,339,000
Other | 157,000 | 672,000
Amount Reported on Balance Sheet | 6,235,000 | 28,011,000
Liabilities |  |
Gross Recognized Derivatives | (122,075,000) | (207,387,000)
Amounts Offset | 22,962,000 | 44,077,000
Net Recognized Derivatives | (99,113,000) | (163,310,000)
Other | (4,405,000) | (4,379,000)
Amount Reported on Balance Sheet | (103,518,000) | (167,689,000)
Assets and Liabilities |  |
Gross Recognized Derivatives | (93,035,000) | (154,031,000)
Amounts Offset | 0 | 18,060,000
Net Recognized Derivatives | (93,035,000) | (135,971,000)
Other | (4,248,000) | (3,707,000)
Amount Reported on Balance Sheet | (97,283,000) | (139,678,000)
Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 24,894,000 | 37,396,000
Amounts Offset | (18,816,000) | (22,163,000)
Net Recognized Derivatives | 6,078,000 | 15,233,000
Other | 157,000 | 672,000
Amount Reported on Balance Sheet | 6,235,000 | 15,905,000
Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 4,146,000 | 15,960,000
Amounts Offset | (4,146,000) | (3,854,000)
Net Recognized Derivatives | 0 | 12,106,000
Other | 0 | 0
Amount Reported on Balance Sheet | 0 | 12,106,000
Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (59,586,000) | (113,560,000)
Amounts Offset | 18,816,000 | 40,223,000
Net Recognized Derivatives | (40,770,000) | (73,337,000)
Other | (4,405,000) | (4,379,000)
Amount Reported on Balance Sheet | (45,175,000) | (77,716,000)
Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (62,489,000) | (93,827,000)
Amounts Offset | 4,146,000 | 3,854,000
Net Recognized Derivatives | (58,343,000) | (89,973,000)
Other | 0 | 0
Amount Reported on Balance Sheet | $ (58,343,000) | $ (89,973,000)

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