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Acquisitions And New Ventures Acquisitions And New Ventures - Pro Forma Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Acquisitions and New Ventures [Abstract]    
Business Acquisition, Non-recurring Acquisition Costs   $ 23,100,000chdn_BusinessAcquisitionNonrecurringAcquisitionCosts
Business Acquisition, Pro Forma Information [Abstract]    
Net revenues 1,126,592,000us-gaap_BusinessAcquisitionsProFormaRevenue 1,085,518,000us-gaap_BusinessAcquisitionsProFormaRevenue
Earnings from continuing operations $ 64,145,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax $ 11,182,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax