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Income Taxes - Federal Statutory Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income before income taxes	$ 69,895	$ 32,081	$ 48,832
Income Tax Statutory Rate Reconciliation [Abstract]
Income tax at federal statutory rate	14,678	6,737	10,255
Increase (decrease) in taxes attributable to:
State taxes, net of federal income tax benefit	4,142	2,251	3,420
Uncertain tax positions	1,351	323	24
Property flow-through	(9,215)	(2,054)	(839)
Capitalized merger costs	(296)	5,350	0
Tax reform - rate change impact on deferred taxes	0	77	0
Reversal of excess deferred taxes recognized in regulatory liability	(2,912)	(2,355)	(1,383)
Pension flow-through	92	(1,244)	0
Stock-based compensation	(333)	(223)	(1,602)
Other items, net	873	(408)	190
Income Tax Expense (Benefit)	$ 8,380	$ 8,454	$ 10,065

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