Significant Accounting Policies (Notes)	3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	3. SIGNIFICANT ACCOUNTING POLICIES Except for the accounting policies for revenue recognition, casino and pari-mutuel taxes, and restricted cash, all of which were updated as a result of our recently adopted accounting pronouncements on January 1, 2018, as described in Note 2, there have been no changes to our significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2017, that have had a material impact on our condensed consolidated financial statements and related notes. Revenue Recognition Racing Racing revenue is generated by pari-mutuel wagering transactions with customers on live and simulcast racing content as well as simulcast host fees earned from other wagering sites. Additionally, we generate revenue through sponsorships, admissions (including luxury suites), personal seat licenses (“PSLs”), television rights, concessions, programs and parking. Our Racing revenue and income are influenced by our racing calendar. Therefore, revenue and operating results for any interim quarter are not generally indicative of the revenue and operating results for the year and may not be comparable with results for the corresponding period of the previous year. We historically have had fewer live racing days during the first quarter of each year, and the majority of our live racing revenue occurs during the second quarter with the running of the Kentucky Oaks and Kentucky Derby. For live races we present at our racetracks, we recognize revenue on wagers we accept from customers at our racetrack (“on-track revenue”) and revenue we earn from exporting our live racing signals to other race tracks, off-track betting facilities ("OTBs"), and advance deposit wagering providers (“export revenue”). For simulcast races we display at our racetracks, OTBs, and TwinSpires, we recognize revenue we earn from providing a wagering service to our customers on these imported live races (“import revenue”). Each wagering contract for on-track revenue and import revenue contains a single performance obligation and our export revenue contracts contain a series of distinct services that form a single performance obligation. The transaction price for on-track revenue and import revenue is fixed based on the established commission rate we are entitled to retain. The transaction price for export revenue is variable based on the simulcast host fee we charge our customers for exporting our signal. Our export revenue contracts generally have a duration of one year or less. These arrangements are licenses of intellectual property containing a usage based royalty. As a result, we have elected to use the practical expedient to omit disclosure related to remaining performance obligations for our export revenue contracts. We recognize on-track revenue, export revenue, and import revenue once the live race event is made official by the relevant racing regulatory body. We evaluate our on-track revenue, export revenue, and import revenue contracts in order to determine whether we are acting as the principal or as the agent when providing services, which we consider in determining if revenue should be reported gross or net. An entity is a principal if it controls the specified service before that service is transferred to a customer. The revenue we recognize for on-track revenue and import revenue is the commission we are entitled to retain for providing a wagering service to our customers. For these arrangements, we are the principal as we control the wagering service; therefore, any charges, including simulcast fees, we incur for delivering the wagering service are presented as operating expenses. For export revenue, our customer is the third party wagering site such as a race track, OTB, or advance deposit wagering provider. Therefore, the revenue we recognize for export revenue is the simulcast host fee we earn for exporting our racing signal to the third party wagering site. Our admission contracts are either for a single live racing event day or multiple days. Our PSLs, sponsorships, and television rights contracts generally relate to multiple live racing event days. Multiple day admission, PSLs, sponsorships, and television rights contracts contain a distinct series of services that form single performance obligations. Sponsorships contracts generally include performance obligations related to admissions and advertising rights at our racetracks. Television rights contracts contain a performance obligation related to the rights to distribute certain live racing events on media platforms. The transaction prices for our admissions, PSLs, sponsorships, and television rights contracts are fixed. We allocate the transaction price to our sponsorship contract performance obligations based on the estimated relative standalone selling price of each distinct service. The revenue we recognize for admissions to a live racing event day is recognized once the related event is complete. For admissions, PSLs, sponsorships, and television rights contracts that relate to multiple live racing event days, we recognize revenue over time using an output method of each completed live racing event day as our measure of progress. Each completed live racing event day corresponds with the transfer of the relevant service to a customer and therefore is considered a faithful depiction of our efforts to satisfy the promises in these contracts. This output method results in measuring the value transferred to date to the customer relative to the remaining services promised under the contracts. Certain premium live racing event days such as the Kentucky Derby and Oaks result in a higher value of revenue allocated relative to other live racing event days due to, among other things, the quality of thoroughbreds racing, higher levels of on-track attendance, national broadcast audience, local and national media coverage, and overall entertainment value of the event. Timing of revenue recognition may differ from the timing of invoicing to customers for our long-term contracts in our Racing segment. We generally invoice customers prior to delivery of services for our admissions, PSLs, sponsorships, and television rights contracts. Accordingly, we recognize a receivable and a contract liability at the time we have an unconditional right to receive payment. When cash is received in advance of delivering services under our contracts, we defer revenue and recognize it in accordance with our policies for that type of contract. In situations where the timing of revenue recognition differs from the timing of invoicing, we have determined our contracts do not include a significant financing component. The primary purpose of our invoicing terms is to allow our customers to secure the right to the specific services provided under our contracts, not to receive financing from our customers. Concessions, programs, and parking revenue is recognized once the good or service is delivered. TwinSpires TwinSpires revenue is generated through pari-mutuel wagering transactions with customers on simulcast racing content through advance deposit wagering. Advance deposit wagering consists of patrons wagering through an advance deposit account. Our TwinSpires revenue and income are influenced by racing calendars similar to our Racing segment. Therefore, revenue and operating results for any interim quarter are not generally indicative of the revenue and operating results for the year and may not be comparable with results for the corresponding period of the previous year. We recognize import revenue in our TwinSpires segment consistent with our policy described in Racing. We may provide cash incentives in conjunction with wagering transactions we accept from customers. These cash incentives represent consideration payable to a customer and therefore are treated as a reduction of the transaction price for the wagering transaction. Casino Casino revenue primarily consists of gaming wager transactions. Other operating revenue, such as food and beverage or hotel revenue, is recognized once delivery of the product or service has occurred. The transaction price for gaming wager transactions is the difference between gaming wins and losses. The majority of our casinos offer loyalty programs that enable customers to earn loyalty points based on their gaming play. Gaming wager transactions involve two performance obligations for those customers earning loyalty points under the Company’s loyalty programs and a single performance obligation for customers who do not participate in the program. Loyalty points are primarily redeemable for free gaming activities and food and beverage. For purposes of allocating the transaction price in a wagering transaction between the wagering performance obligation and the obligation associated with the loyalty points earned, the Company allocates an amount to the loyalty point contract liability based on the stand-alone selling price of the points earned, which is determined by the value of a loyalty point that can be redeemed for gaming activities or food and beverage. An amount is allocated to the gaming wager performance obligation using the residual approach as the stand-alone price for wagers is highly variable and no set established price exists for such wagers. The allocated revenue for gaming wagers is recognized when the wagers occur as all such wagers settle immediately. The loyalty point contract liability amount is deferred and recognized as revenue when the customer redeems the points for a gaming wagering transaction or food and beverage and such goods or services are delivered to the customer. Casino and Pari-mutuel Taxes We recognize casino and pari-mutuel tax expense based on the statutory requirements of the state and local jurisdictions in which we conduct business. All of our casino taxes and the majority of our pari-mutuel taxes are gross receipts taxes levied on the gaming entity. We recognize these taxes as Racing, TwinSpires and Casino operating expenses in our consolidated statements of comprehensive income. In certain jurisdictions governing our Racing and TwinSpires pari-mutuel contracts with customers, there are specific pari-mutuel taxes that are assessed on winning wagers from our customers, which we collect and remit to the government. These taxes are presented on a net basis. Restricted Cash and Account Wagering Deposit Liabilities Amounts included in restricted cash represent amounts due to horsemen for purses, stakes and awards that are paid in accordance with the terms of our contractual agreements or statutory requirements. Restricted cash also includes deposits collected from our TwinSpires segment customers for account wagering that are paid when customers withdraw cash from their account.

3. SIGNIFICANT ACCOUNTING POLICIES

Except for the accounting policies for revenue recognition, casino and pari-mutuel taxes, and restricted cash, all of which were updated as a result of our recently adopted accounting pronouncements on January 1, 2018, as described in Note 2, there have been no changes to our significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2017, that have had a material impact on our condensed consolidated financial statements and related notes.

Revenue Recognition

Racing

Racing revenue is generated by pari-mutuel wagering transactions with customers on live and simulcast racing content as well as simulcast host fees earned from other wagering sites. Additionally, we generate revenue through sponsorships, admissions (including luxury suites), personal seat licenses (“PSLs”), television rights, concessions, programs and parking.

Our Racing revenue and income are influenced by our racing calendar. Therefore, revenue and operating results for any interim quarter are not generally indicative of the revenue and operating results for the year and may not be comparable with results for the corresponding period of the previous year. We historically have had fewer live racing days during the first quarter of each year, and the majority of our live racing revenue occurs during the second quarter with the running of the Kentucky Oaks and Kentucky Derby.

For live races we present at our racetracks, we recognize revenue on wagers we accept from customers at our racetrack (“on-track revenue”) and revenue we earn from exporting our live racing signals to other race tracks, off-track betting facilities ("OTBs"), and advance deposit wagering providers (“export revenue”). For simulcast races we display at our racetracks, OTBs, and TwinSpires, we recognize revenue we earn from providing a wagering service to our customers on these imported live races (“import revenue”). Each wagering contract for on-track revenue and import revenue contains a single performance obligation and our export revenue contracts contain a series of distinct services that form a single performance obligation. The transaction price for on-track revenue and import revenue is fixed based on the established commission rate we are entitled to retain. The transaction price for export revenue is variable based on the simulcast host fee we charge our customers for exporting our signal. Our export revenue contracts generally have a duration of one year or less. These arrangements are licenses of intellectual property containing a usage based royalty. As a result, we have elected to use the practical expedient to omit disclosure related to remaining performance obligations for our export revenue contracts. We recognize on-track revenue, export revenue, and import revenue once the live race event is made official by the relevant racing regulatory body.

We evaluate our on-track revenue, export revenue, and import revenue contracts in order to determine whether we are acting as the principal or as the agent when providing services, which we consider in determining if revenue should be reported gross or net. An entity is a principal if it controls the specified service before that service is transferred to a customer.

The revenue we recognize for on-track revenue and import revenue is the commission we are entitled to retain for providing a wagering service to our customers. For these arrangements, we are the principal as we control the wagering service; therefore, any charges, including simulcast fees, we incur for delivering the wagering service are presented as operating expenses.

For export revenue, our customer is the third party wagering site such as a race track, OTB, or advance deposit wagering provider. Therefore, the revenue we recognize for export revenue is the simulcast host fee we earn for exporting our racing signal to the third party wagering site.

Our admission contracts are either for a single live racing event day or multiple days. Our PSLs, sponsorships, and television rights contracts generally relate to multiple live racing event days. Multiple day admission, PSLs, sponsorships, and television rights contracts contain a distinct series of services that form single performance obligations. Sponsorships contracts generally include performance obligations related to admissions and advertising rights at our racetracks. Television rights contracts contain a performance obligation related to the rights to distribute certain live racing events on media platforms. The transaction prices for our admissions, PSLs, sponsorships, and television rights contracts are fixed. We allocate the transaction price to our sponsorship contract performance obligations based on the estimated relative standalone selling price of each distinct service.

The revenue we recognize for admissions to a live racing event day is recognized once the related event is complete. For admissions, PSLs, sponsorships, and television rights contracts that relate to multiple live racing event days, we recognize revenue over time using an output method of each completed live racing event day as our measure of progress. Each completed live racing event day corresponds with the transfer of the relevant service to a customer and therefore is considered a faithful depiction of our efforts to satisfy the promises in these contracts. This output method results in measuring the value transferred to date to the customer relative to the remaining services promised under the contracts. Certain premium live racing event days such as the Kentucky Derby and Oaks result in a higher value of revenue allocated relative to other live racing event days due to, among other things, the quality of thoroughbreds racing, higher levels of on-track attendance, national broadcast audience, local and national media coverage, and overall entertainment value of the event.

Timing of revenue recognition may differ from the timing of invoicing to customers for our long-term contracts in our Racing segment. We generally invoice customers prior to delivery of services for our admissions, PSLs, sponsorships, and television rights contracts. Accordingly, we recognize a receivable and a contract liability at the time we have an unconditional right to receive payment. When cash is received in advance of delivering services under our contracts, we defer revenue and recognize it in accordance with our policies for that type of contract. In situations where the timing of revenue recognition differs from the timing of invoicing, we have determined our contracts do not include a significant financing component. The primary purpose of our invoicing terms is to allow our customers to secure the right to the specific services provided under our contracts, not to receive financing from our customers.

Concessions, programs, and parking revenue is recognized once the good or service is delivered.

TwinSpires

TwinSpires revenue is generated through pari-mutuel wagering transactions with customers on simulcast racing content through advance deposit wagering. Advance deposit wagering consists of patrons wagering through an advance deposit account.

Our TwinSpires revenue and income are influenced by racing calendars similar to our Racing segment. Therefore, revenue and operating results for any interim quarter are not generally indicative of the revenue and operating results for the year and may not be comparable with results for the corresponding period of the previous year.

We recognize import revenue in our TwinSpires segment consistent with our policy described in Racing.

We may provide cash incentives in conjunction with wagering transactions we accept from customers. These cash incentives represent consideration payable to a customer and therefore are treated as a reduction of the transaction price for the wagering transaction.

Casino

Casino revenue primarily consists of gaming wager transactions. Other operating revenue, such as food and beverage or hotel revenue, is recognized once delivery of the product or service has occurred.

The transaction price for gaming wager transactions is the difference between gaming wins and losses. The majority of our casinos offer loyalty programs that enable customers to earn loyalty points based on their gaming play. Gaming wager transactions involve two performance obligations for those customers earning loyalty points under the Company’s loyalty programs and a single performance obligation for customers who do not participate in the program. Loyalty points are primarily redeemable for free gaming activities and food and beverage. For purposes of allocating the transaction price in a wagering transaction between the wagering performance obligation and the obligation associated with the loyalty points earned, the Company allocates an amount to the loyalty point contract liability based on the stand-alone selling price of the points earned, which is determined by the value of a loyalty point that can be redeemed for gaming activities or food and beverage. An amount is allocated to the gaming wager performance obligation using the residual approach as the stand-alone price for wagers is highly variable and no set established price exists for such wagers. The allocated revenue for gaming wagers is recognized when the wagers occur as all such wagers settle immediately. The loyalty point contract liability amount is deferred and recognized as revenue when the customer redeems the points for a gaming wagering transaction or food and beverage and such goods or services are delivered to the customer.

Casino and Pari-mutuel Taxes

We recognize casino and pari-mutuel tax expense based on the statutory requirements of the state and local jurisdictions in which we conduct business. All of our casino taxes and the majority of our pari-mutuel taxes are gross receipts taxes levied on the gaming entity. We recognize these taxes as Racing, TwinSpires and Casino operating expenses in our consolidated statements of comprehensive income. In certain jurisdictions governing our Racing and TwinSpires pari-mutuel contracts with customers, there are specific pari-mutuel taxes that are assessed on winning wagers from our customers, which we collect and remit to the government. These taxes are presented on a net basis.

Restricted Cash and Account Wagering Deposit Liabilities

Amounts included in restricted cash represent amounts due to horsemen for purses, stakes and awards that are paid in accordance with the terms of our contractual agreements or statutory requirements. Restricted cash also includes deposits collected from our TwinSpires segment customers for account wagering that are paid when customers withdraw cash from their account.