BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)		2 Months Ended	12 Months Ended
	Aug. 16, 2024 USD ($)	Feb. 28, 2026 USD ($)	Dec. 31, 2025 USD ($) financialInstitution facilities powerPlant $ / shares shares	Dec. 31, 2024 USD ($) financialInstitution $ / shares shares	Dec. 31, 2023 USD ($) performanceObligation $ / shares shares
Business and Significant Accounting Policies [Line Items]
Cash, FDIC insured amount			$ 83,600,000	$ 31,200,000
Number of financial institutions | financialInstitution			10	10
Cash, uninsured amount			$ 75,400,000	$ 73,900,000
Trade allowance for credit losses			164,772,000	164,050,000
Interest costs capitalized			28,116,000	14,723,000	$ 17,261,000
Write-off of unsuccessful exploration and storage activities			1,446,000	3,930,000	3,733,000
Amortization of debt issuance costs			6,400,000	5,900,000	5,900,000
Write off of deferred debt issuance cost			0	0	0
Impairment of long-lived assets to be disposed of			0
Impairment of long-lived assets			12,064,000	1,280,000	0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, ending balance			(1,900,000)	(9,300,000)
Change in foreign currency translation adjustments			$ 9,665,000	$ (8,232,000)	$ 1,257,000
Number of storage facilities | facilities			3
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | shares			2,100	38,500	82,500
Cash dividends paid			$ 29,072,000	$ 29,109,000	$ 28,412,000
Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares			$ 0.48	$ 0.48	$ 0.48
Litigation settlement, gain			$ 13,700,000	$ 9,400,000
Settlement Agreement
Business and Significant Accounting Policies [Line Items]
Loss contingency, receivable, proceeds	$ 35,000,000.0
Loss contingency, damages paid, value	25,000,000.0
Loss contingency, purchase agreement, reduction to the cost of good purchased	$ 10,000,000.0
Galena 2 Power Purchase Agreement
Business and Significant Accounting Policies [Line Items]
Termination fees			0	0	$ 0
The Dominica Project
Business and Significant Accounting Policies [Line Items]
Number of performance obligations | performanceObligation					2
Product | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Business and Significant Accounting Policies [Line Items]
Revenue, remaining performance obligation, amount			$ 245,000,000.0
Revenue, remaining performance obligation, (in percentage)			100.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period (month)			24 months
Brawley Power Plant And OREG 2 Facility
Business and Significant Accounting Policies [Line Items]
Impairment of long-lived assets			$ 12,100,000
Energy storage
Business and Significant Accounting Policies [Line Items]
Write-off of unsuccessful exploration and storage activities			$ 1,400,000	2,000,000.0	$ 300,000
Electricity
Business and Significant Accounting Policies [Line Items]
Number of power plants not accounted as operating leases | powerPlant			13
Minimum
Business and Significant Accounting Policies [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (year)			4 years
Lessee, finance lease, term of contract (year)			4 years
Standard product warranty, term (year)			1 year
Minimum | Power Plants
Business and Significant Accounting Policies [Line Items]
Property, plant, and equipment estimated useful lives			15 years
Minimum | Viridity Energy, Inc.
Business and Significant Accounting Policies [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (year)			6 years
Maximum
Business and Significant Accounting Policies [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (year)			19 years
Lessee, finance lease, term of contract (year)			5 years
Standard product warranty, term (year)			2 years
Maximum | Power Plants
Business and Significant Accounting Policies [Line Items]
Property, plant, and equipment estimated useful lives			30 years
Maximum | Viridity Energy, Inc.
Business and Significant Accounting Policies [Line Items]
Acquired finite-lived intangible assets, weighted average useful life (year)			19 years
Total Receivables | Customer Concentration Risk
Business and Significant Accounting Policies [Line Items]
Financing receivable, after allowance for credit loss, total			$ 103,200,000	$ 99,700,000
Primary Customers | Accounts Receivable | Customer Concentration Risk
Business and Significant Accounting Policies [Line Items]
Concentration risk (in percentage)			56.00%	57.00%
Kenya Power and Lighting Co Limited
Business and Significant Accounting Policies [Line Items]
Accounts receivable, past due			$ 29,500,000
Kenya Power and Lighting Co Limited | Subsequent Event
Business and Significant Accounting Policies [Line Items]
Proceeds, overdue accounts receivable		$ 21,100,000
ENEE
Business and Significant Accounting Policies [Line Items]
Accounts receivable, past due			20,300,000
ENEE | Subsequent Event
Business and Significant Accounting Policies [Line Items]
Proceeds, overdue accounts receivable		$ 1,000,000.0
Foreign countries
Business and Significant Accounting Policies [Line Items]
Trade allowance for credit losses			$ 102,000,000.0	$ 105,200,000