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Long-Term Debt (Boyd Senior and Senior Subordinated Notes Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2016 | Jun. 08, 2012 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 06, 2016 | Sep. 02, 2016 | Mar. 28, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt financing costs, net |  |  |  |  | $ 40,718 | $ 14,001 |  |  |  |
Loss on early extinguishments and modifications of debt |  |  | $ 41,518 | $ 863 | 42,364 | 32,333 |  |  |  |
Premium and consent fees paid |  |  |  |  | (15,750) | (24,246) |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Additional Interest Per Annum, Percent of Principal |  |  |  |  |  |  |  |  | 0.25% |
Debt Instrument, Maximum Additional Interest Per Annum, Percent of Principal |  |  |  |  |  |  |  |  | 1.00% |
Parent |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Subsidiaries, Ownership Percentage |  |  |  |  |  |  |  |  | 100.00% |
Debt financing costs, net |  |  |  |  | 40,718 | 14,001 |  |  |  |
Loss on early extinguishments and modifications of debt |  |  | 28,356 | 444 | 28,356 | 30,452 |  |  |  |
Premium and consent fees paid |  |  |  |  | $ (15,750) | (24,246) |  |  |  |
Parent | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 101.00% |  |  |  |  |
Loss on early extinguishments and modifications of debt |  |  | $ (4,497) | 0 | $ (4,497) | 0 |  |  |  |
Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.375% |  | 6.375% |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.00% |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 750,000 |
Debt financing costs, net | $ 13,000 |  |  |  |  |  |  |  |  |
Parent | Senior Notes | 9.00% Senior Notes Due 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 9.00% |  |  | 9.00%
Loss on early extinguishments and modifications of debt |  |  | $ (5,976) | $ 0 | $ (5,976) | $ 0 |  |  |  |
Subsidiary, Peninsula Gaming [Member] | Senior Notes | Peninsula Senior Notes due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 8.375% |  | 8.38%
After July 1, 2016 and Prior to 2018 [Member] | Parent | Senior Notes | 9.00% Senior Notes Due 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 104.50% |  |  |  |  |  |  |  |
After Apr 1, 2021 and Prior to 2024 [Member] | Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 103.188% |  |  |  |  |
Prior to August 15, 2014 [Member] | Subsidiary, Peninsula Gaming [Member] | Senior Notes | Peninsula Senior Notes due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percent of Principal, Subject to Make-whole Premium |  |  |  |  |  |  |  | 100.00% |  |

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