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Commitments, Contingencies And Legal Proceedings Schedule of approximate minimum annual rental payments under non-cancelable leases (Details) (USD $)
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2013 $ 9,813,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2014 7,596,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2015 6,246,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2016 4,854,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2017 1,580,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 235,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total 30,324,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Future receipts from subleases, 2013 $ 200,000cdi_OperatingLeasesFutureMinimumPaymentsFutureReceiptsFromSubleasesDueInNextTwelveMonths