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Shareholders Equity (Details) (USD $)
0 Months Ended 12 Months Ended
Mar. 13, 2008
firm
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 23, 2013
Stock Repurchase Program, Authorized Amount         $ 100,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of investment banking firms consulting with company 1chdn_ClassOfWarrantOrRightTriggerEventRepurchaseNumberOfConsultingBanks        
Percent of common stock issued 200.00%chdn_ClassOfWarrantOrRightValueCommonStockIssuedAsPercentOrExercisePrice        
Maximum percentage of companies assets, cash flow or earnings power before shareholders will lose right to exercise shares 50.00%chdn_ClassOfWarrantOrRightTriggeringEventRepurchaseReductionInQualifyingAccountsEarningsOrCashFlows        
Class of Warrant or Right, Triggering Event, Repurchase, Beneficial Owner, Percentage 50.00%chdn_ClassOfWarrantOrRightTriggeringEventRepurchaseBeneficialOwnerPercentage        
Stock Repurchased During Period, Shares   691,000us-gaap_StockRepurchasedDuringPeriodShares      
Stock Repurchased and Retired During Period, Value   61,561,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 38,400,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1      
Preferred Stock          
Conversion of Stock, Shares Issued 0.0001us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
       
Minimum          
Beneficial ownership percentage 15.00%chdn_ClassOfWarrantOrRightTriggeringEventIssuanceBeneficialOwnerPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Common Stock | Common Stock          
Class or Warrant or Right, Percent of Common Stock Issued 200.00%chdn_ClassOrWarrantOrRightPercentOfCommonStockIssued
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Class of Warrant or Right, Repurchase Rate 1chdn_ClassOfWarrantOrRightRepurchaseRate
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Series A Preferred Stock [Member] | Common Stock          
Class of Warrant or Right, Issuance Rate 1chdn_ClassOfWarrantOrRightIssuanceRate
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember