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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - Commodity Contracts - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets |  |
Gross Recognized Derivatives | $ 50,547 | $ 53,372
Amounts Offset | (23,225) | (22,317)
Net Recognized Derivatives | 27,322 | 31,055
Other | 1,640 | 350
Amount Reported on Balance Sheet | 28,962 | 31,405
Liabilities |  |
Gross Recognized Derivatives | (200,001) | (169,052)
Amounts Offset | 37,125 | 66,217
Net Recognized Derivatives | (162,876) | (102,835)
Other | (8,121) | (7,443)
Amount Reported on Balance Sheet | (170,997) | (110,278)
Assets and Liabilities |  |
Gross Recognized Derivatives | (149,454) | (115,680)
Amounts Offset | 13,900 | 43,900
Net Recognized Derivatives | (135,554) | (71,780)
Other | (6,481) | (7,093)
Amount Reported on Balance Sheet | (142,035) | (78,873)
Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 32,129 | 28,562
Amounts Offset | (18,885) | (15,127)
Net Recognized Derivatives | 13,244 | 13,435
Other | 410 | 350
Amount Reported on Balance Sheet | 13,654 | 13,785
Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 18,418 | 24,810
Amounts Offset | (4,340) | (7,190)
Net Recognized Derivatives | 14,078 | 17,620
Other | 1,230 | 0
Amount Reported on Balance Sheet | 15,308 | 17,620
Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (99,301) | (86,062)
Amounts Offset | 32,785 | 33,829
Net Recognized Derivatives | (66,516) | (52,233)
Other | (8,121) | (7,443)
Amount Reported on Balance Sheet | (74,637) | (59,676)
Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (100,700) | (82,990)
Amounts Offset | 4,340 | 32,388
Net Recognized Derivatives | (96,360) | (50,602)
Other | 0 | 0
Amount Reported on Balance Sheet | $ (96,360) | $ (50,602)

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