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Overview and Summary Of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
The following table summarizes our accounts receivable balances at March 31, 2024 and December 31, 2023:
 March 31,December 31,
 20242023
 (In Thousands)
Accounts receivable, net
     Customer receivables$166,812 $125,715 
     Unbilled revenue
108,806 91,463 
     Amounts due from related parties6,434 5,178 
     Other15,373 13,848 
     Allowance for credit losses(3,765)(2,283)
           Total accounts receivable, net$293,660 $233,921 
Allowance for Credit Losses [Table Text Block]
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the periods indicated:
For the Three Months Ended March 31,
$ in Thousands20242023
Allowance for credit losses:
     Beginning balance$2,283 $1,117 
     Current period provision1,022 983 
     Write-offs charged against allowance
(159)(1,522)
     Recoveries collected619 485 
           Ending Balance$3,765 $1,063 
Schedule of Inventory, Current [Table Text Block]
The following table summarizes our inventories balances at March 31, 2024 and December 31, 2023:
 March 31,December 31,
 20242023
 (In Thousands)
Inventories
     Fuel$69,185 $77,198 
     Materials and supplies, net67,820 66,392 
          Total inventories$137,005 $143,590 
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table provides a summary of cash, cash equivalents and restricted cash amounts reported within the Condensed Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Condensed Consolidated Statements of Cash Flows:
 March 31,December 31,
 20242023
 (In Thousands)
Cash, cash equivalents and restricted cash
     Cash and cash equivalents$435,217 $28,579 
     Restricted cash (included in Prepayments and other current assets)5 5 
          Total cash, cash equivalents and restricted cash$435,222 $28,584 
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of AOCI by component during the three months ended March 31, 2024 and 2023 are as follows (in Thousands):

Details about AOCI components
Affected line item in the Condensed Consolidated Statements of OperationsThree Months Ended March 31,
20242023
Net losses on cash flow hedges (Note 4):Interest expense$1,012 $1,807 
Income tax effect(252)(449)
Total reclassifications for the period, net of income taxes$760 $1,358 
Schedule of Asset Retirement Obligations [Table Text Block]
For the Three Months Ended March 31,
 20242023
 (In Thousands)
Balance as of January 1$249,930 $218,729 
Liabilities incurred7,778 69 
Liabilities settled(1,098)(3,025)
Revisions to cash flow and timing estimates8,525 — 
Accretion expense2,737 2,639 
Balance as of March 31$267,872 $218,412