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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
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Stockholders' Equity Attributable to Parent, Beginning of Period at Dec. 31, 2011 | $ 584,030 us-gaap_StockholdersEquity | $ 260,199 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 323,831 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Shares, Outstanding, Beginning of Period at Dec. 31, 2011 |  | 17,178,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net earnings and comprehensive income | 58,276 us-gaap_NetIncomeLoss |  |  | 58,276 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Issuance of common stock for convertible note payable, shares |  | 155,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for convertible note payable, value | 5,663 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | 5,663 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for employee benefit plans, shares |  | 19,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for employee benefit plan, value | 714 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan | 714 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for long-term incentive plan, shares |  | 158,000 chdn_IssuanceOfCommonStockForLongTermIncentivePlanShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for long-term incentive plan, value | 4,207 chdn_IssuanceOfCommonStockForLongTermIncentivePlan | 4,207 chdn_IssuanceOfCommonStockForLongTermIncentivePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Tax windfall/(shortfall) provision from share-based compensation | 1,407 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 1,407 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock, shares |  | (84,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock repurchased during period, value | (5,094)us-gaap_StockRepurchasedDuringPeriodValue | (5,094)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock Repurchased and Retired During Period, Value | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |
Restricted stock forfeitures | 0 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited | (1,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Grant of restricted stock, shares |  | 23,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Amortization of restricted stock, value | 6,377 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross | 6,377 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends | (12,351)us-gaap_DividendsCommonStockCash |  |  | (12,351)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Restricted dividends | (170)us-gaap_DividendsShareBasedCompensationCash |  |  | (170)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock option plan expense | 1,236 us-gaap_StockOptionPlanExpense | 1,236 us-gaap_StockOptionPlanExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Foreign currency translation adjustment, net of ($70) tax effect | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |
Stockholders' Equity Attributable to Parent, End of Period at Dec. 31, 2012 | 644,295 us-gaap_StockholdersEquity | 274,709 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 369,586 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Shares, Outstanding, End of Period at Dec. 31, 2012 |  | 17,448,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net earnings and comprehensive income | 54,900 us-gaap_NetIncomeLoss |  |  | 54,900 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Issuance of common stock, stock option exercises, shares |  | 7,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock, stock option exercises, value | 330 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 330 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for employee benefit plans, shares |  | 17,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for employee benefit plan, value | 805 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan | 805 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for long-term incentive plan, shares |  | 174,000 chdn_IssuanceOfCommonStockForLongTermIncentivePlanShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for long-term incentive plan, value | 6,371 chdn_IssuanceOfCommonStockForLongTermIncentivePlan | 6,371 chdn_IssuanceOfCommonStockForLongTermIncentivePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Tax windfall/(shortfall) provision from share-based compensation | 2,981 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 2,981 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock, shares |  | (133,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock repurchased during period, value | (10,723)us-gaap_StockRepurchasedDuringPeriodValue | (10,723)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock Repurchased and Retired During Period, Value | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |
Restricted stock forfeitures |  | (1,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Grant of restricted stock, shares |  | 436,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Amortization of restricted stock, value | 20,525 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross | 20,525 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends | (15,186)us-gaap_DividendsCommonStockCash |  |  | (15,186)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Restricted dividends | (466)us-gaap_DividendsShareBasedCompensationCash |  |  | (466)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock option plan expense | 957 us-gaap_StockOptionPlanExpense | 957 us-gaap_StockOptionPlanExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Foreign currency translation adjustment, net of ($70) tax effect | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |
Stockholders' Equity Attributable to Parent, End of Period at Dec. 31, 2013 | 704,789 us-gaap_StockholdersEquity | 295,955 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 408,834 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Shares, Outstanding, End of Period at Dec. 31, 2013 |  | 17,948,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net earnings and comprehensive income | 46,357 us-gaap_NetIncomeLoss |  |  | 46,357 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Issuance of common stock, stock option exercises, shares |  | 186,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock, stock option exercises, value | 6,417 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 6,417 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for employee benefit plans, shares |  | 15,000 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock for employee benefit plan, value | 1,058 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan | 1,058 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Tax windfall/(shortfall) provision from share-based compensation | 7,708 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 7,708 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock, shares | (691,000)us-gaap_StockRepurchasedDuringPeriodShares | (160,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock repurchased during period, value | (15,021)us-gaap_StockRepurchasedDuringPeriodValue | (15,021)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock Repurchased and Retired During Period, Shares | (691,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |
Stock Repurchased and Retired During Period, Value | (61,561)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |
Restricted stock forfeitures |  | (9,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Grant of restricted stock, shares |  | 26,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Amortization of restricted stock, value | 11,527 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross | 11,527 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Cash dividends | (17,026)us-gaap_DividendsCommonStockCash |  |  | (17,026)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Restricted dividends | (319)us-gaap_DividendsShareBasedCompensationCash |  |  | (319)us-gaap_DividendsShareBasedCompensationCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock option plan expense | 404 us-gaap_StockOptionPlanExpense | 404 us-gaap_StockOptionPlanExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock Issued During Period, Shares, Acquisitions | 157,000 us-gaap_StockIssuedDuringPeriodSharesAcquisitions |  |  |
Stock Issued During Period, Value, Acquisitions | 15,793 us-gaap_StockIssuedDuringPeriodValueAcquisitions |  |  |
Foreign currency translation adjustment, net of ($70) tax effect | (125)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  | (125)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Stockholders' Equity Attributable to Parent, End of Period at Dec. 31, 2014 | $ 700,001 us-gaap_StockholdersEquity | $ 262,280 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (125)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 437,846 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Shares, Outstanding, End of Period at Dec. 31, 2014 |  | 17,472,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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