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Long-Term Debt (Interest and Fees - Narrative) (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Mar. 28, 2016 | May 21, 2015 | Aug. 16, 2012 | Nov. 10, 2010
Line of Credit Facility [Line Items] |  |  |  |  |  |
Prepayment fee, percentage | 1.00% |  |  |  |  |
Boyd | Bank Credit Facility | Federal Funds Rate | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate | 0.50% |  |  |  |  |
Boyd | Bank Credit Facility | Eurodollar | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate | 1.00% |  |  |  |  |
Boyd | Revolving Credit Facility, Swing Loan and Term Loan A | LIBOR | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 1.75% |  |  |  |  |
Boyd | Revolving Credit Facility, Swing Loan and Term Loan A | LIBOR | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 2.75% |  |  |  |  |
Boyd | Revolving Credit Facility, Swing Loan and Term Loan A | Base Rate | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 0.75% |  |  |  |  |
Boyd | Revolving Credit Facility, Swing Loan and Term Loan A | Base Rate | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 1.75% |  |  |  |  |
Boyd | Revolving Credit Facility [Member] | Bank Credit Facility | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee percentage on unused portion of credit facility | 0.25% |  |  |  |  |
Boyd | Revolving Credit Facility [Member] | Bank Credit Facility | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee percentage on unused portion of credit facility | 0.50% |  |  |  |  |
Boyd | Refinancing Term B Loans [Member] | LIBOR | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 2.25% |  |  |  |  |
Boyd | Refinancing Term B Loans [Member] | LIBOR | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 2.50% |  |  |  |  |
Boyd | Refinancing Term B Loans [Member] | Base Rate | Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 1.25% |  |  |  |  |
Boyd | Refinancing Term B Loans [Member] | Base Rate | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Applicable margin | 1.50% |  |  |  |  |
Senior Notes | Boyd | Senior Notes Due 2023 [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate | 6.875% | 6.875% |  | 6.875% |  | 6.875%
Senior Notes | Boyd | Senior Notes Due 2026 [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate | 6.375% | 6.375% | 6.375% | 6.375% |  |
Senior Notes | Peninsula | 8.375% Senior Notes due 2018 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate |  |  |  |  | 8.375% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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