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Total Debt - Fiscal Year Maturities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 $ 11,250us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 16,250us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 21,250us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 421,605us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Thereafter 300,000chdn_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour  
Debt, Long-term and Short-term, Combined Amount $ 770,355us-gaap_DebtLongtermAndShorttermCombinedAmount $ 369,191us-gaap_DebtLongtermAndShorttermCombinedAmount