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Derivative Accounting - Derivative Instruments in the Balance Sheet (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Amount Reported on Balance Sheet | $ 1,113,000 | $ 1,982,000
Liabilities |  |
Amount Reported on Balance Sheet | (60,037,000) | (96,422,000)
Commodity Contracts |  |
Assets |  |
Gross Recognized Derivatives | 3,142,000 | 6,719,000
Amounts Offset | (2,185,000) | (5,037,000)
Net Recognized Derivatives | 957,000 | 1,682,000
Other | 156,000 | 300,000
Amount Reported on Balance Sheet | 1,113,000 | 1,982,000
Liabilities |  |
Gross Recognized Derivatives | (60,912,000) | (97,938,000)
Amounts Offset | 2,185,000 | 5,037,000
Net Recognized Derivatives | (58,727,000) | (92,901,000)
Other | (1,310,000) | (3,521,000)
Amount Reported on Balance Sheet | (60,037,000) | (96,422,000)
Assets and Liabilities |  |
Gross Recognized Derivatives | (57,770,000) | (91,219,000)
Amounts Offset | 0 | 0
Net Recognized Derivatives | (57,770,000) | (91,219,000)
Other | (1,154,000) | (3,221,000)
Amount Reported on Balance Sheet | (58,924,000) | (94,440,000)
Commodity Contracts | Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 3,106,000 | 5,427,000
Amounts Offset | (2,149,000) | (3,796,000)
Net Recognized Derivatives | 957,000 | 1,631,000
Other | 156,000 | 300,000
Amount Reported on Balance Sheet | 1,113,000 | 1,931,000
Commodity Contracts | Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 36,000 | 1,292,000
Amounts Offset | (36,000) | (1,241,000)
Net Recognized Derivatives | 0 | 51,000
Other | 0 | 0
Amount Reported on Balance Sheet | 0 | 51,000
Commodity Contracts | Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (36,345,000) | (59,527,000)
Amounts Offset | 2,149,000 | 3,796,000
Net Recognized Derivatives | (34,196,000) | (55,731,000)
Other | (1,310,000) | (3,521,000)
Amount Reported on Balance Sheet | (35,506,000) | (59,252,000)
Commodity Contracts | Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (24,567,000) | (38,411,000)
Amounts Offset | 36,000 | 1,241,000
Net Recognized Derivatives | (24,531,000) | (37,170,000)
Other | 0 | 0
Amount Reported on Balance Sheet | $ (24,531,000) | $ (37,170,000)

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