ACQUISITION AND DIVESTITURES - Property, Plant, and Equipment Acquired (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Feb. 26, 2025
Business Combination [Line Items]
Property, plant, and equipment, net	$ 3,135,540	$ 4,581,771
Power and Gas
Business Combination [Line Items]
Property, plant, and equipment, net			$ 1,516,873
Power and Gas \| Construction in progress
Business Combination [Line Items]
Property, plant, and equipment, net			476
Power and Gas \| Unproved properties
Business Combination [Line Items]
Property, plant, and equipment, net			216,776
Power and Gas \| Proved developed properties
Business Combination [Line Items]
Property, plant, and equipment, net			168,045
Power and Gas \| Power generation
Business Combination [Line Items]
Property, plant, and equipment, net			850,121
Power and Gas \| Computer software
Business Combination [Line Items]
Property, plant, and equipment, net			70
Power and Gas \| Land and improvements
Business Combination [Line Items]
Property, plant, and equipment, net			166,454
Power and Gas \| Buildings
Business Combination [Line Items]
Property, plant, and equipment, net			48,665
Power and Gas \| Machinery & equipment
Business Combination [Line Items]
Property, plant, and equipment, net			62,015
Power and Gas \| Track and track related assets
Business Combination [Line Items]
Property, plant, and equipment, net			4,212
Power and Gas \| Vehicles [Member]
Business Combination [Line Items]
Property, plant, and equipment, net			$ 39
Minimum \| Power and Gas \| Power generation
Business Combination [Line Items]
Estimated remaining useful life in years			12 years
Minimum \| Power and Gas \| Buildings
Business Combination [Line Items]
Estimated remaining useful life in years			10 years
Minimum \| Power and Gas \| Machinery & equipment
Business Combination [Line Items]
Estimated remaining useful life in years			2 years
Minimum \| Power and Gas \| Track and track related assets
Business Combination [Line Items]
Estimated remaining useful life in years			8 years
Minimum \| Power and Gas \| Vehicles [Member]
Business Combination [Line Items]
Estimated remaining useful life in years			2 years
Maximum \| Power and Gas \| Power generation
Business Combination [Line Items]
Estimated remaining useful life in years			37 years
Maximum \| Power and Gas \| Computer software
Business Combination [Line Items]
Estimated remaining useful life in years			2 years
Maximum \| Power and Gas \| Buildings
Business Combination [Line Items]
Estimated remaining useful life in years			39 years
Maximum \| Power and Gas \| Machinery & equipment
Business Combination [Line Items]
Estimated remaining useful life in years			37 years
Maximum \| Power and Gas \| Track and track related assets
Business Combination [Line Items]
Estimated remaining useful life in years			34 years
Maximum \| Power and Gas \| Vehicles [Member]
Business Combination [Line Items]
Estimated remaining useful life in years			3 years