Related Party Transaction Number of Companies Between which Assets and Liabilities Allocated Number of companies between which assets and liabilities are allocated Represents the number of companies, between which assets and liabilities are allocated as per various kind of agreements. Number of retail outlets Represents the number of retail outlets. Number of retail outlets Related Party Transaction Period for Payment Against Services Received Period for payment against services received Represents the period to pay for services received after receipt of an invoice at rates agreed upon as per the agreement. Related Party Transaction Agreement Termination Period by Recipient of Services Agreement termination period by recipient of services Represents the period to terminate the agreement after the request of the party receiving the services. Related Party Transaction Agreement Termination Period by Provider of Services Agreement termination period by provider of services Represents the period to terminate the agreement after the request of the party providing the services. Various Agreements [Member] Various agreements Represents the various agreements entered into by the entity. Award Type [Axis] Going Concern Transition Support Services Agreement [Member] Transition Support Services Agreement Represents the Transition Support Services Agreement, according to which each party has to provide each other with certain administrative and operational services. Casino Facility [Member] Casino facility Represents the structure used in providing the casino facility. Harness Racing Facilities [Member] Harness racing facilities Represents the structure used in providing the harness racing facilities. Amendment Description Entire disclosure for reporting when there is a substantial doubt about an entity's ability to continue as a going concern for a reasonable period of time (generally a year from the balance sheet date). Going Concern Note Disclosure [Text Block] Going Concern Amendment Flag General Facilities [Member] General facilities Represents the structure used in providing the general facilities. Document and Entity Information Other operating Other Operating Revenue Represents other operating revenues which consist of hotel rooms revenue, food and beverage sales and other miscellaneous income. Other operating Other Operating Expense Represents other operating expenses associated with hotel rooms, food and beverage sales and other miscellaneous expenses. Due from State Agency, Current Due from State of Delaware Amount due from state agencies, within one year of the balance sheet date (or the normal operating cycle, whichever is longer). Purses due horsemen Purses Due Horsemen, Current Carrying value as of the balance sheet date of obligations incurred and payable to horsemen for purses earned on harness races. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Increase (Decrease) in Due from State Agency, Current The increase (decrease) during the reporting period in amount due from the state agency within one year (or one business cycle). Due from State of Delaware Arrangements and Non-arrangement Transactions [Domain] Purses due horsemen Increase (Decrease) in Purses Due Horsemen Current The increase (decrease) during the reporting period in the carrying value as of the balance sheet date of obligations incurred and payable to horsemen for purses earned on harness races. Basis of Presentation Increase (Decrease) in Prepaid Taxes and Accrued Taxes Payable Income taxes receivable/payable The increase (decrease) during the reporting period in the amount of payments made in advance for income and other taxes, which will be charged against earnings in future periods and all taxes owed but not paid, including income, property and other taxes. Area of Casino Area of casino (in square feet) Represents the area of the casino. Number of Rooms in Hotel Number of rooms in AAA Four Diamond hotel Represents the number of rooms in the hotel operated by the entity. Number of Wholly Owned Subsidiaries Number of wholly owned subsidiaries Represents the number of wholly owned subsidiaries of the entity. Licensed Agents Number under Delaware State Lottery Code Number of Licensed Agents under Delaware State Lottery Code Represents the number of licensed agents under the Delaware State Lottery Code. Stockholders Equity Note Spinoff Transaction Percentage Contributed by Parent Percentage of the issued and outstanding common stock of Dover Downs, Inc. contributed by DVD Represents the percentage of issued and outstanding common stock contributed by parent as a result of a tax-free spin-off transaction. Percentage of Issued and Outstanding Common Stock Distributed to Parent Stockholders Percentage of issued and outstanding common stock distributed to parent stockholders Represents the percentage of issued and outstanding common stock distributed to parent stockholders. Current Fiscal Year End Date Number of Consecutive Years for which Annual License has been Received Number of consecutive years for which annual license has been received from the Harness Racing Commission Represents the number of consecutive years for which annual license has been received from the Delaware Harness Racing Commission. Gaming Sales [Member] Total gaming win Aggregate revenue during the period from total gaming sales in the normal course of business, after deducting returns, allowances and discounts, when it serves as a benchmark in a concentration of risk calculation. Sales from Capital Club Member Gaming [Member] Capital Club member gaming win Aggregate revenue during the period from Capital Club member gaming sales in the normal course of business, after deducting returns, allowances and discounts, when it serves as a benchmark in a concentration of risk calculation. Out of State [Member] Out of state patrons Represents information pertaining to the geographic area which is out of a specific state. Point Loyalty Program [Policy Text Block] Point loyalty program Disclosure of accounting policy related to the point loyalty program for the entity's customers. Maryland patrons MARYLAND Disclosure of the entity's accounting policy for revenue and expense recognition. Revenue and expense recognition Revenue and Expense Recognition [Policy Text Block] Point loyalty program Point Loyalty Program [Abstract] Revenue and Expense Recognition [Abstract] Revenue and expense recognition Represents the casino operations revenue, expressed as a percentage of the total revenues. Casino Operations [Member] Casino operations Business Concentration Risk [Member] Business concentration risk Reflects the percentage that a specified dollar value on the balance sheet or income statement in the period from one or more specified lines of business is to a corresponding consolidated, segment, or product line amount. Accounting for Stock Based Compensation [Abstract] Accounting for stock-based compensation Document Period End Date Accumulated Other Comprehensive Income (Loss) , Defined Benefit Pension and Other Postretirement Plans Tax Income tax benefit of net actuarial loss and prior service cost not yet recognized in net periodic benefit cost Tax effect of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges Tax Effect Income tax benefit of unrealized loss on interest rate swap Tax effect of accumulated change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes the entity's share of an equity investee's increase (decrease) in deferred hedging gains (losses). Accumulated Other Comprehensive Income (Loss) Available For Sale Securities Adjustment Tax Income tax benefit of accumulated unrealized gain on available-for-sale securities Tax effect of accumulated appreciation (loss) in value of the total of available-for-sale securities at the end of an accounting period. Related Party Transaction, Harness Racing Track Length Harness racing track length (in miles) Represents the length of the harness racing track, located on the related party's property used by the entity during its harness racing season. Related Party Transaction, Motorsports Superspeedway Length Motorsports superspeedway length (in miles) Represents the length of the motorsports superspeedway used by the entity. Related Party Transaction Period for Set Up and Tear Down Rights Period for set up and tear down rights Represents the period of set up and tear down rights granted by the related party, before and after the period beginning from November 1 of each year and ending on April 30 of the following year, covered by the perpetual easement. Represents the number of annual motorsports weekends for which the entity allows related party to use indoor grandstands. Related Party Transaction, Number of Annual Motorsports Weekends Number of annual motorsports weekends Related Party Transaction, Minimum Ownership Percentage in Voting Power Minimum ownership percentage of voting power Represents the minimum ownership percentage of voting power. Common Stock Quarterly Dividends Per Share Declared Quarterly cash dividend (in dollars per share) Dividends declared during the quarter for each share of common stock outstanding. Entity [Domain] State Wide Net Proceeds of Internet Versions to be Retained in Lottery State-wide net proceeds to be retained in lottery Represents the state-wide net proceeds to be retained in lottery before its distribution. Dover International Speedway Dover International Speedway Facility [Member] Represents the information pertaining to the Dover International Speedway facility. Payments for Gaming License Fee Gaming license fee paid The amount of cash paid for gaming license fee during the period. Payments For Table Game License Fee Table game license fee paid The amount of cash paid for table game license fee during the period. Estimated Payment For Table Game License Fee For Next Delaware Lottery Fiscal Year Estimated table game license fee for next Delaware Lottery fiscal year Amount of table game license fee for next Delaware Lottery fiscal year, which begins six months after end of entity's fiscal year. Business Interruption Period Number of days the casino was closed due to a natural disaster. Number of days the casino was closed due to Hurricane Sandy Amended Credit Agreement Estimated Period Anticipated minimum number of months lenders would amend the credit agreement to maintain compliance with financial covenants. Anticipated length of amended credit agreement Facilities [Member] Facilities Represents the structure used in providing different kind of facilities. Win due to Delaware State Lottery Office Due to State Agency, Current Represents the amount of payable due to the state agency. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Accrued Gaming License Fees, Current Gaming license fees Carrying value, as of the balance sheet date, of obligations incurred through that date and payable for gaming license fees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Commitments and Contingencies [Table] Tabular disclosure of components of commitments and contingencies. Commitments and Contingencies [Line Items] Commitments and Contingencies Represents the estimated contingent amount related to employment, severance and noncompete agreements, which is liable to the entity in the event of a change in control and the subsequent termination of employment of all employees. Estimated Contingent Liability Related to Employment Severance and Noncompete Agreements Estimated contingent liability related to employment, severance and noncompete agreements Estimated Tax Gross Ups Payable as Per Agreement Estimated tax gross ups payable under the agreement, due to change in control Represents the estimated amount of tax gross ups payable under the agreements in the event the agreements were triggered due to a change of control. Represents the percentage of monthly amount paid to employees in consideration of noncompete covenants as per the agreement. Monthly amount paid to an executive officer in consideration of noncompete covenants (as a percent) Percentage of Monthly Amount Paid to Employee in Consideration of Noncompete Covenants Passively Managed Exchange Traded Funds [Member] Equities - passively managed securities using ETFs Represents the investment that follows an index, commodity or basket of assets that trades similar to a stock on an exchange, which are passively managed. Actively Managed Exchange Traded Funds [Member] Represents the investment that follows an index, commodity or basket of assets that trades similar to a stock on an exchange, which are actively managed. Equities - actively managed investment vehicles Equity and Exchange Traded Funds [Member] Mutual funds/ETFs An investment that pools funds from many investors to invest in a combination of underlying investments, primarily equity investments as well as which follows an index, commodity or basket of assets that trades similar to a stock on an exchange. Contracts in which the counterparties exchange a series of cash payments based on (a) an equity index and (b) a fixed or floating interest rate on a notional principal amount. Equity-mid cap contracts typically are tied to a stock index, but sometimes they relate to a particular stock or a defined basket of stocks. Equity-mid cap Equity Mid Cap [Member] Equity-large cap Contracts in which the counterparties exchange a series of cash payments based on (a) an equity index and (b) a fixed or floating interest rate on a notional principal amount. Equity-large cap contracts typically are tied to a stock index, but sometimes they relate to a particular stock or a defined basket of stocks. Equity Large Cap [Member] Contracts in which the counterparties exchange a series of cash payments based on (a) an equity index and (b) a fixed or floating interest rate on a notional principal amount. Equity-small cap contracts typically are tied to a stock index, but sometimes they relate to a particular stock or a defined basket of stocks. Equity Small Cap [Member] Equity-small cap Equity Funds Foreign [Member] Represents the investments held in equity funds, which are primarily invested in foreign companies. Equity-international The maximum number of total capital shares permitted to be issued by the entity's charter and bylaws. Shares of authorized capital stock Total Shares Authorized Represents the number of votes to which the holders of common stock are entitled for each share held. Number of votes per common share held Number of Votes Per Common Share Held Termination period of license after change of ownership of the licensed agent Period after Change of Ownership of Licensed Agent to Terminate License Represents the period after a change of ownership of licensed agent after which, the license will automatically terminate. Represents the minimum percentage of acquisition of the interest in the licensed agent directly or indirectly by any individual or the entity due to which, the change of ownership may occur. Minimum acquisition percentage of the licensed agent to effect change of ownership Minimum Acquisition Percentage of Interest in Licensed Agent to Effect Change of Ownership Represents the minimum percentage of transfer of the legal or beneficial interest in the Licensed Agent due to which, the change of ownership may occur. Minimum transfer percentage of legal or beneficial interest in the licensed agent Minimum Transfer Percentage of Legal or Beneficial Interest in Licensed Agent to Effect Change of Ownership Represents the minimum acquisition percentage of outstanding common stock by stockholder for which, prior written approval must be obtained from the Delaware State Lottery Office. Minimum acquisition percentage of outstanding common stock by stockholder for which a prior written approval is needed Minimum Acquisition Percentage of Outstanding Common Stock by Stockholder for which Prior Written Approval Needed Number of shares of common stock to be purchased for each right held by the registered holder Number of shares of common stock to be purchased by registered holders for each right held by them under the stockholder rights plan. Number of Shares of Common Stock to be Purchased for Each Right Held by Registered Holder Represents the unsolicited acquisition of beneficial ownership as a minimum percentage of outstanding combined common stock and Class A common stock. Unsolicited acquisition of beneficial ownership as a percentage of outstanding combined common stock and Class A common stock, minimum Unsolicited Acquisition of Beneficial Ownership as Percentage of Outstanding Stock Represents the tender or exchange offer as a minimum percentage of outstanding combined common stock and Class A common stock. Tender or exchange offer as a percentage of outstanding combined common stock and Class A common stock, minimum Tender or Exchange Offer as Percentage of Outstanding Stock Represents the minimum exercise price as a percentage of fair market value of underlying shares of common stock at the date of the grant. Minimum exercise price as a percentage of fair market value of underlying shares of common stock Share Based Compensation Arrangement by Share Based Payment Award Options Minimum Exercise Price as Percentage of Fair Market Value of Underlying Shares of Common Stock The period of time, from the grant date until the time at which the share-based (option) award expires. Expiration term of options Share Based Compensation Arrangements by Share Based Payment Award Options Expiration Term Share Based Compensation Arrangements by Share Based Payment Award Minimum Period to Retain Common Stock after Exercise of Options Represents the period up to which, the common stock should be held after exercise of options. Minimum period to retain common stock after exercise of options Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, shown as a percentage. Vesting percentage on each anniversary of the grant date Share Based Compensation Arrangement by Share Based Payment Award Vesting Rights Percentage Service period to amortize aggregate market value of the nonvested restricted stock Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Service Period Represents the service period over which, the aggregate market value of the nonvested restricted stock is to be amortized. Accounting Standards Update 2010-16 [Member] Cumulative effect of accounting change for adoption of ASU 2010-16 Summary of Significant Accounting Policies Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type Accounts Receivable, Net, Current Accounts receivable Accounts Payable, Current Accounts payable Payroll and related items Accrued Payroll Taxes, Current Income taxes payable Accrued Income Taxes, Current Accrued benefit cost Accrued Employee Benefits, Current Accrued Liabilities, Current Accrued liabilities Accrued liabilities Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Net actuarial loss and prior service cost not yet recognized in net periodic benefit cost, net of income tax benefit Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Unrealized loss on interest rate swap, net of income tax benefit Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated unrealized gain on available-for-sale securities, net of income tax expense Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Accumulated other comprehensive loss Additional Paid in Capital Additional paid-in capital Additional Paid-in Capital Additional Paid-in Capital [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net earnings to net cash provided by operating activities: Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Advertising costs Advertising Costs, Policy [Policy Text Block] Affiliated Entity [Member] DVD Stock-based compensation expense for restricted stock awards and stock options Allocated Share-based Compensation Expense Compensation Expense Amortization of Financing Costs Amortization of credit facility origination fees Net earnings allocated to nonvested restricted stock awards Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units Anti-dilutive securities not included in the computation of diluted EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Asset Impairment Charges Impairment charge Impairment Charge Asset Impairment Charges [Text Block] Assets, Current [Abstract] Current assets: Assets [Abstract] ASSETS Assets, Current Total current assets Assets Total assets Available-for-sale Securities, Fair Value Disclosure Available-for-sale securities Basis of Presentation Basis of Accounting [Text Block] Board of Directors Chairman [Member] Chairman of board of directors Capital Expenditures Incurred but Not yet Paid Change in accounts payable for capital expenditures Cash and Cash Equivalents, at Carrying Value Cash, beginning of year Cash, end of year Cash Casino Revenue Gaming Casino Expenses Gaming Class of Stock [Domain] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Commitments and Contingencies. Commitments and contingencies (see Notes to the Consolidated Financial Statements) Class A common stock Common Class A [Member] Class A Common Stock Common Stock Common Stock [Member] Corporate common stock Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Value, Issued Common stock Common Stock, Shares, Issued Common stock, shares issued Common stock Common Class B [Member] Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Dividend paid (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Pension Plans Components of deferred income tax assets and liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive earnings Concentration Risk Type [Domain] Business operations Concentration Risk [Line Items] Revenue and expense recognition Concentration Risk Benchmark [Domain] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Estimated percentage of gaming win attributable to patrons Concentration Risk, Percentage Percentage of total revenue accounted by casino operations Basis of consolidation Consolidation, Policy [Policy Text Block] Construction in progress Construction in Progress [Member] Credit Facility [Domain] Credit Facility [Axis] State Current State and Local Tax Expense (Benefit) Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current income tax expense (benefit) Current Income Tax Expense (Benefit) Federal Current Federal Tax Expense (Benefit) Amount of liability for redeemable reward points Customer Loyalty Program Liability, Current Point loyalty program Variable interest rate base Debt Instrument, Description of Variable Rate Basis Converted amount of borrowings Debt Conversion, Original Debt, Amount Debt Disclosure [Text Block] Credit Facility Credit Facility Percentage points added to the reference rate Debt Instrument, Basis Spread on Variable Rate Federal Deferred Federal Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Total deferred income tax liabilities Deferred Tax Liabilities, Gross Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred income tax expense (benefit) Total deferred income tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred income tax assets: Deferred Tax Assets, Net [Abstract] Deferred Tax Assets, Net of Valuation Allowance, Current Deferred income taxes Current deferred income tax assets State Deferred State and Local Income Tax Expense (Benefit) Point loyalty program Deferred Tax Assets, Deferred Income Deferred Revenue, Current Deferred revenue Other Deferred Tax Assets, Other Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Net deferred income tax liabilities Deferred Tax Liabilities, Net Deferred Tax Liabilities, Net, Noncurrent Deferred income taxes Noncurrent deferred income tax liabilities Depreciation - property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Amounts recognized in the consolidated balance sheet: Deferred Tax Liabilities, Net, Classification [Abstract] Deferred income tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Actual gain (loss) on plan assets Defined Benefit Plan, Actual Return on Plan Assets Total Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Amounts recognized in consolidated balance sheets Defined Benefit Plan, Amounts Recognized in Balance Sheet Accumulated benefit obligation for all defined benefit pension plans Defined Benefit Plan, Accumulated Benefit Obligation Weighted-average rate of compensation increase (as a percent) Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Recognized prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Benefits paid Defined Benefit Plan, Benefits Paid 2015 Defined Benefit Plan, Expected Future Benefit Payments, Year Three Change in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Principal assumptions used to determine net periodic pension cost and actuarial value Defined Benefit Plan, Assumptions Used in Calculations [Abstract] Weighted-average rate of compensation increase (as a percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Net actuarial loss Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax Actuarial loss Defined Benefit Plan, Actuarial Gain (Loss) Amounts included in accumulated comprehensive loss which are expected to be recognized as components of net periodic benefit cost in next fiscal year Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract] Actuarial loss Defined Benefit Plan, Amortization of Net Gains (Losses) 2014 Defined Benefit Plan, Expected Future Benefit Payments, Year Two Assumed long-term return on plan assets (as a percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Expected long-term rate of return on plan assets (as a percent) 2017 Defined Benefit Plan, Expected Future Benefit Payments, Year Five Contributions to pension plans Defined Benefit Plan, Contributions by Employer Employer contribution Weighted-average discount rate (as a percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Obligations recognized in consolidated balance sheets Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract] 2016 Defined Benefit Plan, Expected Future Benefit Payments, Year Four Amounts recognized in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract] Curtailment Defined Benefit Plan, Curtailments Weighted-average discount rate (as a percent) Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Prior service cost Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost Credit, after Tax 2013 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months Recognized net actuarial loss Defined Benefit Plan, Amortization of Gains (Losses) Defined Benefit Plan Disclosure [Line Items] Pension Plans Other Defined Benefit Plan, Other Changes Benefit obligation at beginning of year Benefit obligation at end of year Defined Benefit Plan, Benefit Obligation Target allocations for plan assets (as a percent) Defined Benefit Plan, Target Plan Asset Allocations 2018-2022 Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Benefit Obligation Expected benefit payments to be paid Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Interest cost Defined Benefit Plan, Interest Cost Net Periodic Pension Cost Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Fair value of plan assets at beginning of year Fair value of plan assets at end of year Defined Benefit Plan, Fair Value of Plan Assets Fair values of pension assets Total net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost Curtailment gain Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Service cost Defined Benefit Plan, Service Cost Unfunded status Defined Benefit Plan, Funded Status of Plan Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Contributions under the defined contribution 401(k) plan Defined Contribution Plan, Cost Recognized Components of net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Expected contribution to the pension plan in the next fiscal year Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year Defined Benefit Pension Plan, Liabilities, Noncurrent Liability for pension benefits Liability for pension benefits Defined Benefit Plan, Asset Categories [Axis] Depreciation Depreciation Derivative Instrument Risk [Axis] Derivative Financial Instruments, Liabilities, Fair Value Disclosure Interest rate swap Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Abstract] Margin points added to reference rate, high end of the range (as a percent) Derivative, Higher Range of Basis Spread on Variable Rate Fixed interest rate (as a percent) Derivative, Fixed Interest Rate Margin points added to reference rate, low end of the range (as a percent) Derivative, Lower Range of Basis Spread on Variable Rate Derivative Contract Type [Domain] Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Dividends paid, $0.09 per share Dividends, Common Stock Dividends paid, $.12 per share Payable to Dover Motorsports, Inc. Due to Affiliate, Current Payable to DVD Due from Affiliate, Current Receivable from Dover Motorsports, Inc. Net earnings per common share - basic: Earnings Per Share, Basic [Abstract] Earnings Per Share, Diluted Diluted (in dollars per share) Net earnings per common share - diluted (in dollars per share) Net earnings per common share - diluted: Earnings Per Share, Diluted [Abstract] Earnings Per Share, Basic Basic (in dollars per share) Net earnings per common share - basic (in dollars per share) Net earnings per common share Earnings Per Share, Policy [Policy Text Block] Earnings Per Share [Abstract] Net earnings per common share (Note 2): Reconciliation of the effective income tax rate with the applicable statutory federal income tax rate Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] Effective income tax rate (as a percent) Effective Income Tax Rate, Continuing Operations Federal tax at statutory rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate State taxes, net of federal benefit (as a percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes Other (as a percent) Effective Income Tax Rate Reconciliation, Other Adjustments Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Weighted-average period to recognize deferred compensation cost related to nonvested restricted stock Income tax benefit related to restricted stock awards Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options Deferred compensation cost related to nonvested restricted stock Equity Component [Domain] Equities Equity Funds [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Total Fair Value, Hierarchy [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Financial Instruments Fair Value, Inputs, Level 3 [Member] Level 3 Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Financial Instruments Financial Instruments Disclosure [Text Block] Financial Instruments Fixed income Fixed Income Funds [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Gains (Losses) on Extinguishment of Debt Loss on extinguishment of debt General and Administrative Expense General and administrative Geographic concentration risk Geographic Concentration Risk [Member] Impairment Charge Hotel facility Hotel [Member] Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Earnings before income taxes CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE EARNINGS Income Taxes Income Tax Disclosure [Text Block] Income Taxes Income Tax Expense (Benefit), Continuing Operations [Abstract] Total Income Tax Expense (Benefit) Income taxes Total income taxes Income taxes Income Tax, Policy [Policy Text Block] Income Taxes Paid Income tax payments Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Increase (Decrease) in Due to Affiliates, Current Payable to/receivable from Dover Motorsports, Inc. Increase (Decrease) in Income Taxes Payable Income taxes payable Increase (Decrease) in Deferred Revenue Deferred revenue Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other Increase (Decrease) in Inventories Inventories Increase (Decrease) in Other Operating Liabilities Other liabilities Changes in the components of stockholders' equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Dilutive stock options (in shares) Incremental Common Shares Attributable to Share-based Payment Arrangements Interest Expense Interest expense Interest rate swap Interest Rate Swap [Member] Interest Paid Interest paid Inventories Inventory, Policy [Policy Text Block] Inventory, Net Inventories Investments Investment, Policy [Policy Text Block] Weighted average interest rate on the amount outstanding (as a percent) Long-term Debt, Weighted Average Interest Rate Land Land [Member] Liabilities, Current Total current liabilities Liabilities, Current [Abstract] Current liabilities: Liabilities Total liabilities Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Total liabilities and stockholders' equity Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Amount available for borrowing pursuant to the facility Line of Credit Facility, Remaining Borrowing Capacity Outstanding borrowings Line of Credit Facility, Amount Outstanding Amount outstanding under revolving credit agreement Credit facility Line of Credit [Member] Credit Facility Line of Credit Facility [Line Items] Amount available for borrowing subject to the required quarterly debt covenant Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility [Table] Long-term Line of Credit, Noncurrent Revolving line of credit Maximum Maximum [Member] Minimum Minimum [Member] Money market Money Market Funds [Member] Nature of Operations [Text Block] Business Operations Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating activities: Net Cash Provided by (Used in) Continuing Operations Net decrease in cash Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Income (Loss) Available to Common Stockholders, Basic Net earnings Net earnings Net (loss) earnings Net earnings available to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash used in financing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing activities: Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Amount of interest rate swap agreement Notional Amount of Interest Rate Derivatives Operating Expenses [Abstract] Expenses: Operating Expenses Total expenses Operating Income (Loss) Operating earnings Operating earnings Business Operations Other Assets, Noncurrent Other assets Change in net actuarial loss and prior service cost, net of income tax expense Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Increase in comprehensive earnings due to freeze of pension plans Income tax expense on change in pension net actuarial loss and prior service cost Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax Reclassification adjustment for loss realized on available-for-sale securities, net of income taxes Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax Change in pension net actuarial loss and prior service cost, net of income taxes Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Unrealized gain (loss) on interest rate swap, net of income taxes Unrealized gain on interest rate swap, net of income tax expense Unrealized gains on interest rate swap Unrealized gain (loss) on interest rate swap, net of income tax expense (benefit) Income tax expense on unrealized gain (loss) on interest rate swap Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Income tax expense on unrealized gain on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized gain (loss) on available-for-sale securities, net of income taxes Unrealized gain on available-for-sale securities, net of income tax expense Other Liabilities, Noncurrent Other liabilities Other Other Accrued Liabilities, Current Accrued Liabilities Payments for Repurchase of Common Stock Repurchase of common stock Payments to Acquire Property, Plant, and Equipment Capital expenditures Payments to Acquire Available-for-sale Securities Purchase of available-for-sale securities Payments of Ordinary Dividends, Common Stock Dividends paid Credit facility fees Payments of Financing Costs Excess plan Pension Plans, Defined Benefit [Member] Pension and Other Postretirement Benefits Disclosure [Text Block] Pension Plans Plan Asset Categories [Domain] Preferred Stock, Value, Issued Preferred stock, $.10 par value; 1,000,000 shares authorized; shares issued and outstanding: none Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Preferred stock Preferred Stock [Member] Prepaid Taxes Income taxes receivable Prepaid Expense and Other Assets, Current Prepaid expenses and other Proceeds from Long-term Lines of Credit Borrowings from revolving line of credit Proceeds from Sale of Available-for-sale Securities Proceeds from the sale of available-for-sale securities Goods and services provided without charge to customers as promotional items Promotional Allowances Estimated useful lives Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Type [Domain] Property and Equipment Property and equipment Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Property and equipment Property, Plant and Equipment [Line Items] Property and Equipment Property and equipment, gross Property, Plant and Equipment, Gross Schedule of estimated useful lives of property and equipment Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment, Type [Axis] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Quarterly Results (unaudited) Quarterly Financial Information [Text Block] Quarterly Results (unaudited) Range [Axis] Range [Domain] Real estate Real Estate Funds [Member] Related Party Transactions Disclosure [Text Block] Related Party Transactions Related Party Transaction [Line Items] Related Party Transactions Related Party [Domain] Related Party Transaction, Expenses from Transactions with Related Party Costs allocated to the entity by DVD Related Party Transactions Related Party [Axis] Repayments of Long-term Lines of Credit Repayments of revolving line of credit Restatement Adjustment [Member] Restatement Restricted Stock [Member] Nonvested restricted stock Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings Retained Earnings [Member] Revenue from Related Parties Costs allocated to DVD Revenues Total revenues Revenues Revenues [Abstract] Revenues: Revenues Sales [Member] Scenario, Unspecified [Domain] Schedule of nonvested restricted stock activity Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Schedule of current and deferred income tax provisions Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Summary of valuation of financial instrument Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of components of net periodic pension cost Schedule of Net Benefit Costs [Table Text Block] Schedule of the plan's funded status Schedule of Net Funded Status [Table Text Block] Schedule of changes in the components of stockholders' equity Schedule of Stockholders Equity [Table Text Block] Schedule of amounts recognized in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Schedule of fair values of the company's pension assets by asset category Schedule of Allocation of Plan Assets [Table Text Block] Schedule of computation of basic and diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of reconciliation of the effective income tax rate with the applicable statutory federal income tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of accrued liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of amounts included in accumulated comprehensive loss which are expected to be recognized as components of net periodic benefit cost in next fiscal year Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] Schedule of amounts recognized in the company's consolidated balance sheets Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Schedule of quarterly results Schedule of Quarterly Financial Information [Table Text Block] Schedule of components of deferred income tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of principal assumptions used to determine net periodic pension cost and actuarial value of the benefit obligation Schedule of Assumptions Used [Table Text Block] Schedule of accumulated other comprehensive loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of benefit payments expected to be paid Schedule of Expected Benefit Payments [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Property, Plant and Equipment [Table] Segment information Segment Reporting, Policy [Policy Text Block] Segment [Domain] Segment, Geographical [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of Shares Share-based Compensation Stock-based compensation Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Nonvested at the beginning of the period (in dollars per share) Nonvested at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Fair value of stock options vested Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stockholders' Equity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Nonvested at the end of the period (in shares) Nonvested at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Shares available for granting options or stock awards Common stock shares reserved for issuance under the 2012 Stock Incentive Plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Award Type [Domain] Accounting for stock-based compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Statement [Table] Scenario [Axis] Statement [Line Items] Statement Stockholders' Equity CONSOLIDATED STATEMENTS OF CASH FLOWS Business Segments [Axis] Equity Components [Axis] CONSOLIDATED BALANCE SHEETS Geographical [Axis] Class of Stock [Axis] Repurchase and retirement of common stock Amount of common stock purchased and retired Stock Repurchased and Retired During Period, Value Number of shares of outstanding common stock authorized to be repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Options [Member] Stock option Number of common stock shares purchased and retired Stock Repurchased and Retired During Period, Shares Number of remaining shares of common stock authorized to be repurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Issuance of nonvested stock awards, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Balance at the beginning of the period Balance at the end of the period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Stockholders' Equity Attributable to Parent Total stockholders' equity Stockholders' Equity Stockholders' Equity Note, Stock Split, Conversion Ratio Conversion ratio of shares Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Supplemental Cash Flow Elements [Abstract] Supplemental information: SERP Supplemental Employee Retirement Plans, Defined Benefit [Member] Type of Adoption [Domain] Type of Arrangement and Non-arrangement Transactions [Axis] Use of estimates Use of Estimates, Policy [Policy Text Block] Weighted-average shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted-average shares and dilutive shares outstanding Weighted Average Number of Shares Outstanding, Diluted Accounts receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Minimum Term for Compliance of Financial Covenants Minimum term for compliance of financial covenants Represents the minimum term for compliance of financial covenants. Schedule of Property, Plant and Equipment, Components [Table TextBlock] Tabular disclosure of the components of property, plant and equipment. Schedule of property and equipment