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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 28, 2016 | May 21, 2015 | Aug. 16, 2012 | Nov. 10, 2010
--- | --- | --- | --- | --- | --- | ---
For the year ending December 31, |  |  |  |  |  |
Unamortized discount | $ (1,556) | $ (1,888) |  |  |  |
Unamortized origination fees | (44,122) | (51,786) |  |  |  |
Current maturities of long-term debt | 23,981 | 30,336 |  |  |  |
Long-term debt, gross, excluding current maturities | 3,097,577 | 3,252,793 |  |  |  |
Long-term debt, net of current maturities and debt issuance costs | 3,051,899 | 3,199,119 |  |  |  |
Boyd |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Outstanding principal | 3,121,558 | 3,283,129 |  |  |  |
Current maturities of long-term debt | 23,895 | 30,250 |  |  |  |
Long-term debt, net of current maturities and debt issuance costs | $ 3,051,481 | $ 3,198,613 |  |  |  |
Boyd | Bank Credit Facility | Bank Credit Facility |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Blended interest rate at period end | 3.882% | 3.44% |  |  |  |
Unamortized discount | $ (1,556) | $ (1,888) |  |  |  |
Unamortized origination fees | (23,795) | (28,503) |  |  |  |
Long-term debt, net | 1,595,703 | 1,752,147 |  |  |  |
Boyd | Senior Notes | Senior Notes Due 2026 [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Unamortized discount | 0 | 0 |  |  |  |
Unamortized origination fees | (10,872) | $ (12,074) |  |  |  |
Long-term debt, net | $ 739,128 |  |  |  |  |
Debt instrument, stated interest rate | 6.375% | 6.375% | 6.375% | 6.375% |  |
Boyd | Senior Notes | Senior Notes Due 2023 [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Unamortized discount | $ 0 | $ 0 |  |  |  |
Unamortized origination fees | (9,455) | (11,209) |  |  |  |
Long-term debt, net | $ 740,545 | $ 738,791 |  |  |  |
Debt instrument, stated interest rate | 6.875% | 6.875% |  | 6.875% |  | 6.875%
Boyd | Other |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Blended interest rate at period end | 5.80% | 5.80% |  |  |  |
Unamortized discount | $ 0 | $ 0 |  |  |  |
Unamortized origination fees | 0 | 0 |  |  |  |
Long-term debt, net | 504 | 591 |  |  |  |
Peninsula | Senior Notes | 8.375% Senior Notes due 2018 |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Debt instrument, stated interest rate |  |  |  |  | 8.375% |
Eliminations [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Outstanding principal | 3,121,558 | 3,283,129 |  |  |  |
Unamortized discount | (1,556) | (1,888) |  |  |  |
Unamortized origination fees | (44,122) | (51,786) |  |  |  |
Long-term debt, net | 3,075,880 | 3,229,455 |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |  |  |
Long-term debt, net of current maturities and debt issuance costs | 0 | 0 |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Boyd | Other |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Outstanding principal | 504 | 591 |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Boyd | Senior Notes | Senior Notes Due 2026 [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Outstanding principal | 750,000 | 750,000 |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Boyd | Senior Notes | Senior Notes Due 2023 [Member] |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Outstanding principal | 750,000 | 750,000 |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Boyd | Bank Credit Facility | Bank Credit Facility |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |
Outstanding principal | $ 1,621,054 | $ 1,782,538 |  |  |  |

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