Income Taxes Income Taxes - Income Tax Reconcilation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory tax on earnings before income taxes	$ 26,782	$ 29,928	$ 31,929
State income taxes, net of federal income tax benefit	1,388	1,514	2,185
Non-deductible lobbying and contributions	999	723	946
Tax credits and incentives	(1,209)	(663)	(494)
Tax adjustments	(485)	(174)	(1,093)
Accruals and settlements related to tax audits	529	(395)	(686)
Valuation allowance	0	(220)	0
Change in effective state tax rates	(401)	(383)	197
Income Tax Reconcilation, Deductions, Non-deductible Transaction Costs	947	0	0
Income Tax Reconcilation, Deductions, Non-deductible Acquisition Related Charges	1,339	0	0
Other permanent differences	272	143	91
Income Tax Expense (Benefit), Continuing Operations	$ 30,161us-gaap_IncomeTaxExpenseBenefit	$ 30,473us-gaap_IncomeTaxExpenseBenefit	$ 33,075us-gaap_IncomeTaxExpenseBenefit

Income Tax Reconcilation, Deductions, Non-deductible Acquisition Related Charges

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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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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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