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Derivatives and Risk Management - Schedules of Fair Values and Locations of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross Asset | $ 44,788 | $ 24,702
Gross Liability | (86,787) | (83,280)
Collateral Netted | 12,016 | 8,666
Net Asset (Liability) on Balance Sheet | (29,983) | (49,912)
Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | 6,166 | 616
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 0 |
Gross Liability | (88) |
Collateral Netted | 0 |
Net Asset (Liability) on Balance Sheet | (88) |
Other Current Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 1,966 | 0
Gross Liability | (38,135) | (19,575)
Collateral Netted | 5,850 | 8,050
Net Asset (Liability) on Balance Sheet | (30,319) | (11,525)
Other Current Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 32,554 | 11,037
Gross Liability | (41,589) | (14,007)
Collateral Netted | 6,166 | 487
Net Asset (Liability) on Balance Sheet | (2,869) | (2,483)
Other Current Assets [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 30
Gross Liability |  | 0
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | 30
Other Current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 3,430 | 9,203
Gross Liability | (46) | (8,306)
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | 3,384 | 897
Other Property And Investments Net And Other Non-current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 1,318 |
Gross Liability | 0 |
Collateral Netted | 0 |
Net Asset (Liability) on Balance Sheet | 1,318 |
Other Property And Investments Net And Other Non-current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 5,442 | 1,755
Gross Liability | (2,425) | (1,159)
Collateral Netted | 0 | 0
Net Asset (Liability) on Balance Sheet | 3,017 | 596
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 952
Gross Liability |  | (32,190)
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | (31,238)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 78 | 1,725
Gross Liability | (4,504) | (8,043)
Collateral Netted | 0 | 129
Net Asset (Liability) on Balance Sheet | $ (4,426) | $ (6,189)

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