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Fair Value Disclosures (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Charges $ 47,000us-gaap_RestructuringCharges $ 370,000us-gaap_RestructuringCharges    
Fair value of assets 8,577,000us-gaap_AssetsFairValueDisclosure [1]   8,786,000us-gaap_AssetsFairValueDisclosure [2]  
Prepaid Expenses and Other Current Assets [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Deferred compensation plan assets 800,000us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember		   700,000us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember		  
Other Non-Current Assets [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Deferred compensation plan assets 7,800,000us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember		 [1]   8,100,000us-gaap_DeferredCompensationPlanAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember		 [1]  
Bond Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 1,710,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		   1,879,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		  
Large Cap Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 2,739,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		   2,852,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		  
International Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 1,441,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		   1,405,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		  
Mid Cap Mutual Cap [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 604,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		   606,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		  
Small Cap Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 483,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		   470,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		  
Balanced Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 353,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		   339,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		  
Money Market Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 1,247,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		   1,235,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		  
Level 1 [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 8,577,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]   8,786,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2]  
Level 1 [Member] | Bond Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 1,710,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		   1,879,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		  
Level 1 [Member] | Large Cap Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 2,739,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		   2,852,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		  
Level 1 [Member] | International Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 1,441,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		   1,405,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		  
Level 1 [Member] | Mid Cap Mutual Cap [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 604,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		   606,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		  
Level 1 [Member] | Small Cap Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 483,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		   470,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		  
Level 1 [Member] | Balanced Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 353,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		   339,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		  
Level 1 [Member] | Money Market Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 1,247,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		   1,235,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		  
Level 2 [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]  
Level 2 [Member] | Bond Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		  
Level 2 [Member] | Large Cap Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		  
Level 2 [Member] | International Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		  
Level 2 [Member] | Mid Cap Mutual Cap [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		  
Level 2 [Member] | Small Cap Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		  
Level 2 [Member] | Balanced Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		  
Level 2 [Member] | Money Market Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		  
Level 3 [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2]  
Level 3 [Member] | Bond Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BondMutualFundsMember		  
Level 3 [Member] | Large Cap Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_LargeCapMutualFundsMember		  
Level 3 [Member] | International Mutual Fund [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_InternationalMutualFundsMember		  
Level 3 [Member] | Mid Cap Mutual Cap [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_MidCapMutualFundsMember		  
Level 3 [Member] | Small Cap Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_SmallCapMutualFundsMember		  
Level 3 [Member] | Balanced Mutual Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= cdi_BalancedMutualFundsMember		  
Level 3 [Member] | Money Market Funds [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Fair value of assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		   0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_MoneyMarketFundsMember		  
Employee Severance [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve     2,031,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		  
Restructuring Charges 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		 37,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		    
Restructuring Reserve, Settled without Cash 0us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		 0us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		    
Employee Severance [Member] | Accrued Liabilities [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve 1,124,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		 3,436,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		   4,568,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Payments for Restructuring (907,000)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		 (1,169,000)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		    
Real estate exit and related costs        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve     2,600,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		  
Restructuring Charges 33,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		 303,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		    
Restructuring Reserve, Settled without Cash 0us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		 0us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		    
Real estate exit and related costs | Accrued Liabilities [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve 2,340,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		 984,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		   769,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Payments for Restructuring (293,000)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		 (88,000)us-gaap_PaymentsForRestructuring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember		    
Asset Write-offs [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve     0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AssetWriteOffsMember		  
Restructuring Charges 14,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AssetWriteOffsMember		 30,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AssetWriteOffsMember		    
Restructuring Reserve, Settled without Cash (14,000)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AssetWriteOffsMember		 (30,000)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AssetWriteOffsMember		    
Accrued restructuring liability        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve     4,631,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AccruedRestructuringLiabilityMember		  
Accrued restructuring liability | Accrued Liabilities [Member]        
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]        
Restructuring Reserve $ 3,464,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AccruedRestructuringLiabilityMember		 $ 4,420,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AccruedRestructuringLiabilityMember		   $ 5,337,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= cdi_AccruedRestructuringLiabilityMember
[1] As of March 31, 2015, $0.8 million and $7.8 million are included in “Prepaid expenses and other current assets” (liability offset in “Other accrued expenses and other current liabilities”) and “Other non-current assets” (liability offset in “Deferred compensation”), respectively, in the consolidated balance sheets reflecting the non-qualified Deferred Compensation Plan assets.
[2] (1) As of December 31, 2014, $0.7 million and $8.1 million are included in “Prepaid expenses and other current assets” (liability offset in “Other accrued expenses and other current liabilities”) and “Other non-current assets” (liability offset in “Deferred compensation”), respectively, in the consolidated balance sheets reflecting the non-qualified Deferred Compensation Plan assets.