Leases - Two Creeks Solar Project (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) a extension	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 45,900,000	$ 23,300,000
Two Creeks Solar Project
Lessee, Lease, Description [Line Items]
Solar land lease acreage | a	600
Lease initial term	30 years
Number of contract extensions | extension	2
Renewal term	10 years
Lease extended term	50 years
Finance lease obligation	$ 7,700,000
Finance lease obligation at end of life of solar land contract	$ 0