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Income Taxes (Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Document Fiscal Year Focus	2014
Income tax provision at the statutory rate	$ 43,768us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 30,694us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 20,862us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit	4,674us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3,807us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	2,357us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Permanent difference – non deductible items	1,608us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	1,592us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	1,681us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Other	1,507us-gaap_IncomeTaxReconciliationOtherReconcilingItems	465us-gaap_IncomeTaxReconciliationOtherReconcilingItems	1,242us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total	$ 51,557us-gaap_IncomeTaxExpenseBenefit	$ 36,558us-gaap_IncomeTaxExpenseBenefit	$ 26,142us-gaap_IncomeTaxExpenseBenefit

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Section S99

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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 exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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