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Derivatives and Risk Management - Schedules of Fair Values and Locations of Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross Asset | $ 35,669 | $ 43,222
Gross Liability | (97,348) | (82,203)
Collateral Netted | 4,477 | 10,148
Net Asset (Liability) on Balance Sheet | (57,202) | (28,833)
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | 10,100 | 6,770
Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Collateral Netted | (5,623) | 3,378
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 7 |
Gross Liability | (52) |
Collateral Netted | 0 |
Net Asset (Liability) on Balance Sheet | (45) |
Other Current Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 238
Gross Liability |  | (9,379)
Collateral Netted |  | 1,316
Net Asset (Liability) on Balance Sheet |  | (7,825)
Other Current Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 136 | 34,760
Gross Liability | (4,534) | (41,241)
Collateral Netted | 0 | 3,378
Net Asset (Liability) on Balance Sheet | (4,398) | (3,103)
Other Current Assets [Member] | Foreign Exchange Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 97
Gross Liability |  | 0
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | 97
Other Current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 589
Gross Liability |  | 0
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | 589
Other Current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 27,305 | 416
Gross Liability | (22,188) | (245)
Collateral Netted | (4,551) | 0
Net Asset (Liability) on Balance Sheet | 566 | 171
Other Property And Investments Net And Other Non-current Assets [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 8,221 | 6,369
Gross Liability | (3,976) | (5,446)
Collateral Netted | (1,072) | 0
Net Asset (Liability) on Balance Sheet | 3,173 | 923
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset | 0 | 725
Gross Liability | (66,598) | (24,677)
Collateral Netted | 10,100 | 5,454
Net Asset (Liability) on Balance Sheet | $ (56,498) | (18,498)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Asset |  | 28
Gross Liability |  | (1,215)
Collateral Netted |  | 0
Net Asset (Liability) on Balance Sheet |  | $ (1,187)

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