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Fair Value - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | $ 34,903 | $ 43,222
Liability | 112,098 | 82,203
Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 8,967 | 10,283
Financial Liabilities Fair Value Disclosure | 70,128 | 30,613
Counterparty and Cash Collateral Netting, Assets | (33,959) | (41,442)
Counterparty and Cash Collateral Netting, Liabilities | (41,970) | (51,590)
Fair Value, Recurring [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 2,559 | 2,232
Fair Value, Recurring [Member] | Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 5,464 | 6,271
Fair Value, Recurring [Member] | Energy commodity derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Counterparty and Cash Collateral Netting, Assets | (33,952) | (40,452)
Derivative Asset | 944 | 1,094
Counterparty and Cash Collateral Netting, Liabilities | (30,983) | (43,830)
Derivative Liability | 444 | 1,314
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Counterparty and Cash Collateral Netting, Assets | (7) |
Derivative Asset |  | 97
Counterparty and Cash Collateral Netting, Liabilities | (7) |
Derivative Liability | 18 |
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 |  | (27)
Counterparty and Cash Collateral Netting, Liabilities |  | (27)
Derivative Liability | 2,628 | 2,976
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Counterparty and Cash Collateral Netting, Assets |  | (963)
Derivative Asset |  | 589
Counterparty and Cash Collateral Netting, Liabilities | (10,980) | (7,733)
Derivative Liability | 67,038 | 26,323
Fair Value, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 8,023 | 8,503
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed Income Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 2,559 | 2,232
Fair Value, Recurring [Member] | Level 1 [Member] | Equity Funds [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Deferred compensation assets: | 5,464 | 6,271
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure | 34,903 | 43,195
Financial Liabilities Fair Value Disclosure | 109,470 | 79,200
Fair Value, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 34,896 | 41,546
Liability | 31,427 | 45,144
Fair Value, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset | 7 | 97
Liability | 25 |
Fair Value, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset |  | 1,552
Liability | 78,018 | 34,056
Fair Value, Recurring [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets, Fair Value Disclosure |  | 27
Financial Liabilities Fair Value Disclosure | 2,628 | 3,003
Fair Value, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Asset |  | 27
Liability | $ 2,628 | $ 3,003

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