Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Fixed rate	$ 112,524	$ 80,164
Variable rate	190,493	194,279
Other	12,274	5,866
Total	315,291	280,309
Electricity [Member]
Disaggregation of Revenue [Line Items]
Fixed rate	108,523	77,383
Variable rate	154,568	150,500
Other
Total	263,091	227,883
Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Fixed rate	4,001	2,781
Variable rate	35,925	43,779
Other
Total	39,926	46,560
Others [Member]
Disaggregation of Revenue [Line Items]
Fixed rate
Variable rate
Other	12,274	5,866
Total	$ 12,274	$ 5,866