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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Current Taxes:    
Federal $ 8,093us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations $ 12,882us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State, net of federal benefit 804us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,499us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total $ 8,897us-gaap_IncomeTaxExpenseBenefit $ 14,381us-gaap_IncomeTaxExpenseBenefit