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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Commodity Contracts |  |
Assets |  |
Gross Recognized Derivatives | $ 46,045 | $ 53,372
Amounts Offset | (17,712) | (22,317)
Net Recognized Derivatives | 28,333 | 31,055
Other | 4,902 | 350
Amount Reported on Balance Sheet | 33,235 | 31,405
Liabilities |  |
Gross Recognized Derivatives | (175,678) | (169,052)
Amounts Offset | 35,412 | 66,217
Net Recognized Derivatives | (140,266) | (102,835)
Other | (8,096) | (7,443)
Amount Reported on Balance Sheet | (148,362) | (110,278)
Assets and Liabilities |  |
Gross Recognized Derivatives | (129,633) | (115,680)
Amounts Offset | 17,700 | 43,900
Net Recognized Derivatives | (111,933) | (71,780)
Other | (3,194) | (7,093)
Amount Reported on Balance Sheet | (115,127) | (78,873)
Commodity Contracts | Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 25,485 | 28,562
Amounts Offset | (12,925) | (15,127)
Net Recognized Derivatives | 12,560 | 13,435
Other | 2,162 | 350
Amount Reported on Balance Sheet | 14,722 | 13,785
Commodity Contracts | Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 20,560 | 24,810
Amounts Offset | (4,787) | (7,190)
Net Recognized Derivatives | 15,773 | 17,620
Other | 2,740 | 0
Amount Reported on Balance Sheet | 18,513 | 17,620
Commodity Contracts | Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (83,203) | (86,062)
Amounts Offset | 30,626 | 33,829
Net Recognized Derivatives | (52,577) | (52,233)
Other | (8,096) | (7,443)
Amount Reported on Balance Sheet | (60,673) | (59,676)
Assets and Liabilities |  |
Amounts Offset |  | 43,900
Commodity Contracts | Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (92,475) | (82,990)
Amounts Offset | 4,786 | 32,388
Net Recognized Derivatives | (87,689) | (50,602)
Other | 0 | 0
Amount Reported on Balance Sheet | (87,689) | (50,602)
Designated as Hedging Instruments |  |
Liabilities |  |
Gross Recognized Derivatives | $ (4,000) | $ (4,000)

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