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Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | $ 44,788 | $ 24,702
Liability | 86,787 | 83,280
Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 17,267 | 10,222
Financial Liabilities Fair Value Disclosure | 37,702 | 51,435
Counterparty and Cash Collateral Netting, Assets | (37,069) | (23,179)
Counterparty and Cash Collateral Netting, Liabilities | (49,085) | (31,845)
Fair Value, Recurring [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 1,963 | 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: | 7,585 | 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 | (34,984) | (22,152)
Derivative Asset | 6,401 | 1,493
Counterparty and Cash Collateral Netting, Liabilities | (41,150) | (22,768)
Derivative Liability | 1,217 | 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 | (1,966) | (952)
Derivative Asset | 1,318 |
Counterparty and Cash Collateral Netting, Liabilities | (7,816) | (9,002)
Derivative Liability | 30,319 | 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 | (119) | (75)
Derivative Asset | 0 |
Counterparty and Cash Collateral Netting, Liabilities | (119) | (75)
Derivative Liability | 6,078 | 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 | 88 |
Fair Value, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 9,548 | 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: | 1,963 | 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: | 7,585 | 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 | 44,669 | 24,627
Financial Liabilities Fair Value Disclosure | 80,590 | 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 | 41,385 | 23,645
Liability | 42,367 | 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 | 3,284 | 952
Liability | 38,135 | 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 | 88 |
Fair Value, Recurring [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 119 | 75
Financial Liabilities Fair Value Disclosure | 6,197 | 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 | 119 | 75
Liability | 6,197 | $ 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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