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Income Taxes - Schedule of Income Tax Exepnse (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ 34,941us-gaap_CurrentFederalTaxExpenseBenefit $ 30,757us-gaap_CurrentFederalTaxExpenseBenefit $ 18,458us-gaap_CurrentFederalTaxExpenseBenefit
State 4,928us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4,533us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,818us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current 39,869us-gaap_CurrentIncomeTaxExpenseBenefit 35,290us-gaap_CurrentIncomeTaxExpenseBenefit 21,276us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 4,870us-gaap_DeferredFederalIncomeTaxExpenseBenefit 10,056us-gaap_DeferredFederalIncomeTaxExpenseBenefit 7,697us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 475us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,220us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,065us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred 5,345us-gaap_DeferredIncomeTaxExpenseBenefit 11,276us-gaap_DeferredIncomeTaxExpenseBenefit 8,762us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 45,214us-gaap_IncomeTaxExpenseBenefit $ 46,566us-gaap_IncomeTaxExpenseBenefit $ 30,038us-gaap_IncomeTaxExpenseBenefit