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Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) - Commodity Contracts - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Gross Recognized Derivatives | $ 36,613 | $ 53,356
Amounts Offset | (11,904) | (26,017)
Net Recognized Derivatives | 24,709 | 27,339
Other | (8) | 672
Amount Reported on Balance Sheet | 24,701 | 28,011
Liabilities |  |
Gross Recognized Derivatives | (204,061) | (207,387)
Amounts Offset | 29,504 | 44,077
Net Recognized Derivatives | (174,557) | (163,310)
Other | (4,329) | (4,379)
Amount Reported on Balance Sheet | (178,886) | (167,689)
Assets and Liabilities |  |
Gross Recognized Derivatives | (167,448) | (154,031)
Amounts Offset | 17,600 | 18,060
Net Recognized Derivatives | (149,848) | (135,971)
Other | (4,337) | (3,707)
Amount Reported on Balance Sheet | (154,185) | (139,678)
Current Assets |  |
Assets |  |
Gross Recognized Derivatives | 25,365 | 37,396
Amounts Offset | (9,268) | (22,163)
Net Recognized Derivatives | 16,097 | 15,233
Other | (8) | 672
Amount Reported on Balance Sheet | 16,089 | 15,905
Investments and Other Assets |  |
Assets |  |
Gross Recognized Derivatives | 11,248 | 15,960
Amounts Offset | (2,636) | (3,854)
Net Recognized Derivatives | 8,612 | 12,106
Other | 0 | 0
Amount Reported on Balance Sheet | 8,612 | 12,106
Current Liabilities |  |
Liabilities |  |
Gross Recognized Derivatives | (115,822) | (113,560)
Amounts Offset | 26,868 | 40,223
Net Recognized Derivatives | (88,954) | (73,337)
Other | (4,329) | (4,379)
Amount Reported on Balance Sheet | (93,283) | (77,716)
Deferred Credits and Other |  |
Liabilities |  |
Gross Recognized Derivatives | (88,239) | (93,827)
Amounts Offset | 2,636 | 3,854
Net Recognized Derivatives | (85,603) | (89,973)
Other | 0 | 0
Amount Reported on Balance Sheet | $ (85,603) | $ (89,973)

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