Income Taxes Income Taxes - Income Tax Reconcilation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory tax on earnings before income taxes	$ 29,928	$ 31,929	$ 33,280
State income taxes, net of federal income tax benefit	1,514	2,185	3,283
Non-deductible lobbying and contributions	723	946	517
Tax credits and incentives	(663)	(494)	(775)
Tax adjustments	(174)	(1,093)	(434)
Accruals and settlements related to tax audits	(395)	(686)	(426)
Valuation allowance	(220)	0	105
Change in effective state tax rates	(383)	197	(714)
Other permanent differences	143	91	(547)
Income Tax Expense (Benefit), Continuing Operations	$ 30,473	$ 33,075	$ 34,289

Income Tax Reconcilation, Deductions, Non-deductible Lobbying and Contributions

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Income Tax Reconciliation, Deductions, Tax Adjustments

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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 increase (decrease) in the valuation allowance for deferred tax assets.

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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 increase (decrease) in the income tax rates.

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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