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Fixed Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Land $ 26,770,000us-gaap_Land $ 26,770,000us-gaap_Land  
Buildings and improvements 131,174,000us-gaap_BuildingsAndImprovementsGross 127,940,000us-gaap_BuildingsAndImprovementsGross  
Furniture and equipment 107,288,000us-gaap_FurnitureAndFixturesGross 108,819,000us-gaap_FurnitureAndFixturesGross  
Capitalized software 162,065,000us-gaap_CapitalizedComputerSoftwareGross 147,140,000us-gaap_CapitalizedComputerSoftwareGross  
Leasehold improvements 8,991,000us-gaap_LeaseholdImprovementsGross 8,610,000us-gaap_LeaseholdImprovementsGross  
Fixed assets, gross 436,288,000us-gaap_PropertyPlantAndEquipmentGross 419,279,000us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation and amortization (277,312,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (262,563,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Fixed assets, net 158,976,000us-gaap_PropertyPlantAndEquipmentNet 156,716,000us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense $ 22,100,000us-gaap_Depreciation $ 24,600,000us-gaap_Depreciation $ 30,800,000us-gaap_Depreciation