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Income Taxes Federal Statutory Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income before income taxes	$ 61,154	$ 76,777	$ 36,519
Income Tax Statutory Rate Reconciliation [Abstract]
“Expected” federal income tax	21,404	26,872	12,782
Increase (decrease) in taxes attributable to:
State taxes, net of federal income tax benefit	3,332	4,155	1,836
Dividend received deduction	(43)	(46)	(60)
Uncertain tax positions	3	0	(650)
Sales & Use Enterprise Zone Credit	0	(880)	0
Tangible Property Regulations	(1,081)	(5,127)	0
Other items, net	(343)	(3)	227
Income Tax Expense (Benefit)	$ 23,272	$ 24,971	$ 14,135

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Effective Income Tax Rate Reconciliation, Uncertain Tax Positions

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and 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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