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Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross Asset $ 36,581 $ 24,702
Liability 74,940 83,280
Fair Value, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 13,460 10,222
Financial Liabilities Fair Value Disclosure 33,327 51,435
Counterparty and Cash Collateral Netting, Assets (32,524) (23,179)
Counterparty and Cash Collateral Netting, Liabilities (41,613) (31,845)
Fair Value, Recurring [Member] | Fixed Income Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets: [1] 1,809 2,471
Fair Value, Recurring [Member] | Equity Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets: [1] 7,594 6,228
Fair Value, Recurring [Member] | Energy commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Counterparty and Cash Collateral Netting, Assets (40,300) (22,152)
Derivative Asset 1,433 1,493
Counterparty and Cash Collateral Netting, Liabilities (31,211) (22,768)
Derivative Liability 2,908 262
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 (143) (75)
Counterparty and Cash Collateral Netting, Liabilities (143) (75)
Derivative Liability 7,771 8,410
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset 19 30
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Counterparty and Cash Collateral Netting, Assets (1,170) (952)
Derivative Asset 1,149  
Counterparty and Cash Collateral Netting, Liabilities (1,170) (9,002)
Derivative Liability 24,104 42,763
Fair Value, Recurring [Member] | Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 9,403 8,699
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] 1,809 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: [1] 7,594 6,228
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 36,438 24,627
Financial Liabilities Fair Value Disclosure 67,026 74,795
Fair Value, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross Asset 41,733 23,645
Liability 34,119 23,030
Fair Value, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross Asset 19 30
Fair Value, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross Asset 2,319 952
Liability 25,274 51,765
Fair Value, Recurring [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 143 75
Financial Liabilities Fair Value Disclosure 7,914 8,485
Fair Value, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross Asset 143 75
Liability $ 7,914 $ 8,485
[1] These assets are included in other property and investments-net and other non-current assets on the Consolidated Balance Sheets