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Income Taxes Federal Statutory Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income before income taxes	$ 48,832	$ 96,493	$ 86,381
Income Tax Statutory Rate Reconciliation [Abstract]
“Expected” federal income tax	10,255	33,773	30,233
Increase (decrease) in taxes attributable to:
State taxes, net of federal income tax benefit	3,420	4,986	4,874
Dividend received deduction	(4)	(18)	(21)
Uncertain tax positions	24	12	16
Tangible Property Regulations	(899)	(1,159)	(1,184)
Tax reform - rate change impact on deferred taxes	0	(2,357)	0
Reversal of excess deferred taxes recognized in regulatory liability	(1,383)	0	0
Stock-based compensation	(1,602)	(552)	0
Noncontrolling interest income	0	(664)	0
Other items, net	254	1,372	(376)
Income Tax Expense (Benefit)	$ 10,065	$ 35,393	$ 33,542

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