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Derivatives and Risk Management - Schedules of Fair Values and Locations of Derivative Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross Asset | $ 24,702 | $ 43,222
Gross Liability | (83,280) | (82,203)
Collateral Netting | 8,666 | 10,148
Net Asset (Liability) on Balance Sheet | (49,912) | (28,833)
Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netting | 616 | 3,378
Other Current Assets [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 30 | 97
Net Asset (Liability) on Balance Sheet | 30 | 97
Other Current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 589
Net Asset (Liability) on Balance Sheet |  | 589
Other Current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 9,203 | 416
Gross Liability | (8,306) | (245)
Net Asset (Liability) on Balance Sheet | 897 | 171
Other Current Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 238
Gross Liability | (19,575) | (9,379)
Collateral Netting | 8,050 | 1,316
Net Asset (Liability) on Balance Sheet | (11,525) | (7,825)
Other Current Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 11,037 | 34,760
Gross Liability | (14,007) | (41,241)
Collateral Netting | 487 | 3,378
Net Asset (Liability) on Balance Sheet | (2,483) | (3,103)
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 952 | 725
Gross Liability | (32,190) | (24,677)
Collateral Netting |  | 5,454
Net Asset (Liability) on Balance Sheet | (31,238) | (18,498)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 1,725 | 28
Gross Liability | (8,043) | (1,215)
Collateral Netting | 129 |
Net Asset (Liability) on Balance Sheet | (6,189) | (1,187)
Other Property And Investments Net And Other Non-current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 1,755 | 6,369
Gross Liability | (1,159) | (5,446)
Net Asset (Liability) on Balance Sheet | $ 596 | $ 923

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