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Basis Of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]      
Debt Issuance Cost   $ 6,300,000us-gaap_DebtIssuanceCosts  
Restricted cash 26,065,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 36,074,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue  
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Deferred Finance Costs, Gross 1,100,000us-gaap_DeferredFinanceCostsGross 2,300,000us-gaap_DeferredFinanceCostsGross 100,000us-gaap_DeferredFinanceCostsGross
Advertising Expense 9,900,000us-gaap_AdvertisingExpense 9,500,000us-gaap_AdvertisingExpense 6,900,000us-gaap_AdvertisingExpense
Advanced Sales of Personal Seat Licenses, Contractual Life, Term One 1 year    
Advanced Sales of Personal Seat Licenses, Contractual Life, Term Two 2 years    
Advanced Sales of Personal Seat Licenses, Contractual Life, Term Three 3 years    
Advanced Sales of Personal Seat Licenses, Contractual Life, Term Four 5 years    
Advanced Sales of Personal Seat Licenses, Contractual Life, Term Five 30 years    
HRE Trust Fund      
Variable Interest Entity [Line Items]      
Restricted cash   $ 8,800,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_LitigationCaseAxis
= chdn_HreTrustFundMember
 
Minimum      
Variable Interest Entity [Line Items]      
Pari-Mutuel Tax Rate 0.50%chdn_PariMutuelTaxRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Gaming Tax Rate 1.50%chdn_GamingTaxRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Variable Interest Entity [Line Items]      
Pari-Mutuel Tax Rate 10.00%chdn_PariMutuelTaxRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Gaming Tax Rate 46.00%chdn_GamingTaxRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember