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Reporting Segments Schedule of fixed assets by geographic area (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Property and equipment, net $ 20,350us-gaap_PropertyPlantAndEquipmentNet $ 20,528us-gaap_PropertyPlantAndEquipmentNet
US    
Segment Reporting Information [Line Items]    
Property and equipment, net 18,843us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 18,535us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
UK    
Segment Reporting Information [Line Items]    
Property and equipment, net 1,285us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 1,633us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB
Canada    
Segment Reporting Information [Line Items]    
Property and equipment, net 138us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 221us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA
Other    
Segment Reporting Information [Line Items]    
Property and equipment, net $ 84us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= cdi_OtherForeignCountriesMember		 $ 139us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= cdi_OtherForeignCountriesMember