Income Taxes Income Taxes - Income Tax Reconcilation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory tax on earnings before income taxes	$ 32,000	$ 33,280	$ 9,765
State income taxes, net of federal income tax benefit	2,190	3,283	299
Non-deductible lobbying and contributions	946	517	439
Tax credits and incentives	(494)	(775)	(36)
Non-deductible transaction costs	0	0	531
Tax adjustments	(1,093)	(434)	(1,960)
Accruals and settlements related to tax audits	(686)	(426)	(853)
Valuation allowance	0	105	0
Change in effective state tax rates	197	(714)	32
Other permanent differences	92	(547)	124
Income Tax Expense (Benefit), Continuing Operations	$ 33,152	$ 34,289	$ 8,341

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

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Income Tax Reconciliation, Deductions, Tax Adjustments

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the income tax rates under enacted tax laws in the period.

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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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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles and enacted tax laws.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy.

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