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Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ 16,838	$ 11,961
Tax effect of regulatory treatment of utility plant differences	(3,240)	(2,402)
State income tax expense	552	1,227
Settlement of equity awards	930	165
Other	(2,916)	(2,419)
Total income tax expense	$ 12,164	$ 8,532
Federal income taxes at statutory rates	21.00%	21.00%
Tax effect of regulatory treatment of utility plant differences	(4.00%)	(4.20%)
State income tax expense	0.70%	2.10%
Settlement of equity awards	1.10%	0.30%
Other	(3.60%)	(4.20%)
Total income tax expense	15.20%	15.00%

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