BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)						1 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Aug. 16, 2024 USD ($)	Dec. 11, 2023 USD ($)	Oct. 19, 2023	Jul. 11, 2023 USD ($)	Mar. 14, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) performanceObligation $ / shares	Feb. 28, 2025 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) powerPlant $ / shares shares	Dec. 31, 2023 USD ($) performanceObligation $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Oct. 23, 2023 USD ($)	Jun. 27, 2022 USD ($)	Jun. 22, 2022 USD ($) $ / shares
Business and Significant Accounting Policies [Line Items]
Cash, FDIC insured amount						$ 43,200,000				$ 31,200,000	$ 43,200,000
Cash, uninsured amount						57,500,000				73,900,000	57,500,000
Trade allowance for credit losses						208,704,000				164,050,000	208,704,000
Interest costs capitalized										14,723,000	17,261,000	$ 18,727,000
Write-off of unsuccessful exploration activities										3,930,000	3,733,000	828,000
Amortization of debt issuance costs										5,900,000	5,900,000	4,200,000
Write off of deferred debt issuance cost										0	0	0
Impairment of long-lived assets to be disposed of										0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, ending balance						$ 2,300,000				9,300,000	2,300,000
Change in foreign currency translation adjustments										$ (8,232,000)	$ 1,257,000	$ (2,486,000)
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | shares										38,500	82,500	29,200
Cash dividends paid										$ 29,109,000	$ 28,412,000	$ 27,143,000
Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares										$ 0.48	$ 0.48	$ 0.48
Common stock, par or stated value per share (in dollars per share) | $ / shares					$ 0.001	$ 0.001				$ 0.001	$ 0.001				$ 0.001
Proceeds from issuance of common stock, net of stock issuance costs										$ 0	$ 341,671,000	$ 0
Payments for repurchase of common stock									$ 18,000,000	0	0	17,964,000
Treasury stock, shares, acquired (in shares) | shares									258,667
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares									$ 69.45
Payments to noncontrolling interests										6,373,000	9,856,000	$ 5,880,000
Litigation settlement, gain										9,400,000
Gain on Business Interruption Insurance Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]												Total revenues
Fire
Business and Significant Accounting Policies [Line Items]
Insurance recoveries												$ 21,800,000
Increase (decrease) in insurance settlements receivable												8,000,000
Gain on business interruption insurance recovery												13,800,000
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
Loss contingency, purchase agreement, reduction to the cost of good purchased	$ 10,000,000
Commercial paper
Business and Significant Accounting Policies [Line Items]
Debt instrument, face amount		$ 26,800,000											$ 73,200,000
Debt instrument, issuance period			90 days
Debt instrument, issuance, extension period			90 days
Debt instrument, basis spread on variable rate			1.10%
Debt instrument, frequency of periodic payment		ninety days
Debt instrument, base rate		4.60%
ORPD LLC
Business and Significant Accounting Policies [Line Items]
Subsidiary, ownership percentage, noncontrolling owner (in percentage)				63.25%
ORPD LLC | Northleaf Geothermal Holdings Northleaf
Business and Significant Accounting Policies [Line Items]
Subsidiary, ownership percentage, noncontrolling owner (in percentage)				36.75%
Goldman Sachs & Co. LLC
Business and Significant Accounting Policies [Line Items]
Proceeds from issuance of common stock, net of stock issuance costs					$ 341,700,000
Goldman Sachs & Co. LLC | Public Offering
Business and Significant Accounting Policies [Line Items]
Stock issued during period, shares, new issues (in shares) | shares					3,600,000
Shares issued, price per share (in dollars per share) | $ / shares					$ 82.60
Public offering, purchase option, period					30 days
Goldman Sachs & Co. LLC | Over-Allotment Option
Business and Significant Accounting Policies [Line Items]
Stock issued during period, shares, new issues (in shares) | shares					540,000
Northleaf Geothermal Holdings Northleaf | ORPD LLC
Business and Significant Accounting Policies [Line Items]
Payments to noncontrolling interests				$ 30,000,000
Convertible Senior Notes
Business and Significant Accounting Policies [Line Items]
Amortization of debt issuance costs										$ 2,300,000	$ 2,300,000	1,100,000
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares						$ 90.27				$ 90.27	$ 90.27				$ 90.27
Debt instrument, face amount														$ 431,250,000	$ 375,000,000
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]
Long-term purchase commitment, period						25 years
Number of performance obligations | performanceObligation						2					2
Product | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Business and Significant Accounting Policies [Line Items]
Revenue, remaining performance obligation, amount										$ 338,300,000
Revenue, remaining performance obligation, (in percentage)										100.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period (month)										24 months
North Brawley Geothermal Power Plant
Business and Significant Accounting Policies [Line Items]
Asset impairment charges, total								$ 30,500,000
Energy storage
Business and Significant Accounting Policies [Line Items]
Write-off of unsuccessful exploration activities										$ 2,000,000.0
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)										17 years
Lessee, finance lease, term of contract (year)										5 years
Standard product warranty, term (year)										2 years
Maximum | Commercial paper
Business and Significant Accounting Policies [Line Items]
Debt instrument, issuance, extension period			5 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						$ 161,000,000.0				$ 99,700,000	$ 161,000,000.0
Primary Customers | Accounts Receivable | Customer Concentration Risk
Business and Significant Accounting Policies [Line Items]
Concentration risk (in percentage)										57.00%	57.00%
Kenya Power and Lighting Co Limited
Business and Significant Accounting Policies [Line Items]
Accounts receivable, past due										$ 38,300,000
Kenya Power and Lighting Co Limited | Subsequent Event
Business and Significant Accounting Policies [Line Items]
Proceeds, overdue accounts receivable							$ 20,000,000.0
ENEE
Business and Significant Accounting Policies [Line Items]
Accounts receivable, past due										16,200,000
ENEE | Subsequent Event
Business and Significant Accounting Policies [Line Items]
Proceeds, overdue accounts receivable							$ 2,500,000
Non-US
Business and Significant Accounting Policies [Line Items]
Trade allowance for credit losses						$ 152,200,000				$ 105,200,000	$ 152,200,000