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Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | $ 79,716 | $ 24,702
Liability | 105,998 | 83,280
Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 26,242 | 10,222
Financial Liabilities Fair Value Disclosure | 30,377 | 51,435
Counterparty and Cash Collateral Netting, Assets | (63,278) | (23,179)
Counterparty and Cash Collateral Netting, Liabilities | (75,621) | (31,845)
Fair Value, Recurring [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 1,888 | 2,471
Counterparty and Cash Collateral Netting, Assets | 0 |
Fair Value, Recurring [Member] | Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 7,916 | 6,228
Counterparty and Cash Collateral Netting, Assets | 0 |
Fair Value, Recurring [Member] | Energy Commodity Derivatives [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Counterparty and Cash Collateral Netting, Assets | (61,098) | (22,152)
Derivative Asset | 13,961 | 1,493
Counterparty and Cash Collateral Netting, Liabilities | (73,441) | (22,768)
Derivative Liability | 582 | 262
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Counterparty and Cash Collateral Netting, Assets | (2,072) | (952)
Derivative Asset | 2,477 |
Counterparty and Cash Collateral Netting, Liabilities | (2,072) | (9,002)
Derivative Liability | 18,660 | 42,763
Fair Value, Recurring [Member] | Natural Gas Exchange Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Counterparty and Cash Collateral Netting, Assets | (108) | (75)
Derivative Asset | 0 |
Counterparty and Cash Collateral Netting, Liabilities | (108) | (75)
Derivative Liability | 11,049 | 8,410
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative Asset |  | 30
Counterparty and Cash Collateral Netting, Liabilities | 0 |
Derivative Liability | 86 |
Fair Value, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 9,804 | 8,699
Financial Liabilities Fair Value Disclosure | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 1,888 | 2,471
Fair Value, Recurring [Member] | Level 1 [Member] | Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 7,916 | 6,228
Fair Value, Recurring [Member] | Level 1 [Member] | Energy Commodity Derivatives [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 0 |
Liability | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 0 |
Liability | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Natural Gas Exchange Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 0 |
Liability | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Foreign Exchange Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liability | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 79,608 | 24,627
Financial Liabilities Fair Value Disclosure | 94,841 | 74,795
Fair Value, Recurring [Member] | Level 2 [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | Energy Commodity Derivatives [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 75,059 | 23,645
Liability | 74,023 | 23,030
Fair Value, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 4,549 | 952
Liability | 20,732 | 51,765
Fair Value, Recurring [Member] | Level 2 [Member] | Natural Gas Exchange Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 0 |
Liability | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset |  | 30
Liability | 86 |
Fair Value, Recurring [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 108 | 75
Financial Liabilities Fair Value Disclosure | 11,157 | 8,485
Fair Value, Recurring [Member] | Level 3 [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Energy Commodity Derivatives [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 0 |
Liability | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 0 |
Liability | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 108 | 75
Liability | 11,157 | $ 8,485
Fair Value, Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liability | $ 0 |

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226049-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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