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Income Taxes Federal Statutory Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income before income taxes	$ 86,381	$ 61,154	$ 76,777
Income Tax Statutory Rate Reconciliation [Abstract]
“Expected” federal income tax	30,233	21,404	26,872
Increase (decrease) in taxes attributable to:
State taxes, net of federal income tax benefit	4,874	3,332	4,155
Dividend received deduction	(21)	(43)	(46)
Uncertain tax positions	16	3	0
Sales & Use Enterprise Zone Credit	(117)	0	(880)
Tangible Property Regulations	(1,184)	(1,081)	(5,127)
Other items, net	(259)	(343)	(3)
Income Tax Expense (Benefit)	$ 33,542	$ 23,272	$ 24,971

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Effective Income Tax Rate Reconciliation, Uncertain Tax Positions

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Increase (Decrease) in Tax Expense [Abstract]

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend.

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