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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - Commodity Contracts - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Gross Recognized Derivatives | $ 29,847,000 | $ 54,798,000
Amounts Offset | (25,637,000) | (35,103,000)
Net Recognized Derivatives | 4,210,000 | 19,695,000
Other | 12,000 | 0
Derivative assets | 4,222,000 | 19,695,000
Liabilities |  |
Gross Recognized Derivatives | (126,728,000) | (104,123,000)
Amounts Offset | 25,637,000 | 35,103,000
Other | (4,054,000) | (4,054,000)
Net Recognized Derivatives | (101,091,000) | (69,020,000)
Amount Reported on Balance Sheet | (105,145,000) | (73,074,000)
Assets and Liabilities |  |
Gross Recognized Derivatives | (96,881,000) | (49,325,000)
Amounts Offset | 0 | 0
Net Recognized Derivatives | (96,881,000) | (49,325,000)
Other | (4,042,000) | (4,054,000)
Amount Reported on Balance Sheet | (100,923,000) | (53,379,000)
Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 28,193,000 | 48,094,000
Amounts Offset | (23,983,000) | (28,400,000)
Net Recognized Derivatives | 4,210,000 | 19,694,000
Other | 12,000 | 0
Derivative assets | 4,222,000 | 19,694,000
Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 1,654,000 | 6,704,000
Amounts Offset | (1,654,000) | (6,703,000)
Net Recognized Derivatives | 0 | 1,000
Other | 0 | 0
Derivative assets | 0 | 1,000
Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (61,861,000) | (50,182,000)
Amounts Offset | 23,983,000 | 28,400,000
Other | (4,054,000) | (4,054,000)
Net Recognized Derivatives | (37,878,000) | (21,782,000)
Amount Reported on Balance Sheet | (41,932,000) | (25,836,000)
Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (64,867,000) | (53,941,000)
Amounts Offset | 1,654,000 | 6,703,000
Other | 0 | 0
Net Recognized Derivatives | (63,213,000) | (47,238,000)
Amount Reported on Balance Sheet | $ (63,213,000) | $ (47,238,000)

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