CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Construction work in progress	$ 749,572	$ 712,204
Assets, Current [Abstract]
Allowance for doubtful accounts	30,392	20,080
Common shareholder’s equity:
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	749,572	712,204
Allowance for doubtful accounts	$ 30,392	20,080
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	1,000
Common Stock, Shares, Outstanding	200
Subsidiaries [Member]
ASSETS
Construction work in progress	$ 749,572	712,204
Assets, Current [Abstract]
Allowance for doubtful accounts	30,392	20,080
Common shareholder’s equity:
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	749,572	712,204
Allowance for doubtful accounts	$ 30,392	$ 20,080
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common Stock, Shares, Outstanding	85,903,791	85,903,791