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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 25, 2018 | Dec. 31, 2017 | Mar. 28, 2016 | May 21, 2015 | Aug. 16, 2012 | Nov. 10, 2010
--- | --- | --- | --- | --- | --- | --- | ---
For the year ending December 31, |  |  |  |  |  |  |
Unamortized discount | $ (1,286) |  | $ (1,556) |  |  |  |
Unamortized origination fees | (49,449) |  | (44,122) |  |  |  |
Current maturities of long-term debt | 24,181 |  | 23,981 |  |  |  |
Long-term debt, gross, excluding current maturities | 4,005,854 |  | 3,097,577 |  |  |  |
Long-term debt, net of current maturities and debt issuance costs | 3,955,119 |  | 3,051,899 |  |  |  |
Boyd |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Outstanding principal | 4,030,035 |  | 3,121,558 |  |  |  |
Current maturities of long-term debt | 23,895 |  | 23,895 |  |  |  |
Long-term debt, net of current maturities and debt issuance costs | $ 3,896,699 |  | $ 3,051,481 |  |  |  |
Boyd | Bank Credit Facility | Bank Credit Facility |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Blended interest rate at period end | 4.651% |  | 3.882% |  |  |  |
Unamortized discount | $ (1,286) |  | $ (1,556) |  |  |  |
Unamortized origination fees | (21,515) |  | (23,795) |  |  |  |
Long-term debt, net | 1,748,529 |  | 1,595,703 |  |  |  |
Boyd | Senior Notes | Senior Notes Due 2026 [Member] |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Unamortized discount | 0 |  | 0 |  |  |  |
Unamortized origination fees | (9,594) |  | $ (10,872) |  |  |  |
Long-term debt, net | $ 740,406 |  |  |  |  |  |
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 | (7,701) |  | (9,455) |  |  |  |
Long-term debt, net | $ 742,299 |  | $ 740,545 |  |  |  |
Debt instrument, stated interest rate | 6.875% |  | 6.875% |  | 6.875% |  | 6.875%
Boyd | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Unamortized discount | $ 0 |  |  |  |  |  |
Unamortized Debt Issuance Expense | $ (10,639) |  |  |  |  |  |
Debt instrument, stated interest rate | 6.00% | 6.00% |  |  |  |  |
Boyd | Other |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Blended interest rate at period end | 11.01% |  | 5.80% |  |  |  |
Unamortized discount | $ 0 |  | $ 0 |  |  |  |
Unamortized origination fees | 0 |  | 0 |  |  |  |
Long-term debt, net | 58,705 |  | 504 |  |  |  |
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 | 4,030,035 |  | 3,121,558 |  |  |  |
Unamortized discount | (1,286) |  | (1,556) |  |  |  |
Unamortized origination fees | (49,449) |  | (44,122) |  |  |  |
Long-term debt, net | 3,979,300 |  | 3,075,880 |  |  |  |
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 | 58,705 |  | 504 |  |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Boyd | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Long-term debt, net | 689,361 |  |  |  |  |  |
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 1 [Member] | Boyd | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |  |  |  |  |  |
For the year ending December 31, |  |  |  |  |  |  |
Outstanding principal | 700,000 |  |  |  |  |  |
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 | $ 1,771,330 |  | $ 1,621,054 |  |  |  |

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