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Fair Value Measurements (Fair Value Balance Sheet Long-Term Debt Grouping) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 28, 2016 | May 21, 2015 | Aug. 16, 2012 | Nov. 10, 2010
--- | --- | --- | --- | --- | --- | ---
Parent Company [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding principal | $ 3,121,558 | $ 3,283,129 |  |  |  |
Parent Company [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt |  | 3,229,455 |  |  |  |
Parent Company [Member] | Estimated Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument |  | 3,403,069 |  |  |  |
Parent Company [Member] | Fixed Rate Debt | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 504 | 591 |  |  |  |
Parent Company [Member] | Fixed Rate Debt | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument | 504 | 591 |  |  |  |
Parent Company [Member] | Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 504 | 591 |  |  |  |
Parent Company [Member] | Other | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding principal | 504 | 591 |  |  |  |
Parent Company [Member] | Bank Credit Facility | Bank Credit Facility |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 1,595,703 | 1,752,147 |  |  |  |
Parent Company [Member] | Bank Credit Facility | Bank Credit Facility | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding principal | 1,621,054 | 1,782,538 |  |  |  |
Parent Company [Member] | Bank Credit Facility | Bank Credit Facility | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 1,595,703 | 1,752,147 |  |  |  |
Parent Company [Member] | Bank Credit Facility | Bank Credit Facility | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument | $ 1,625,178 | $ 1,791,853 |  |  |  |
Parent Company [Member] | Senior Notes Due 2023 [Member] | Senior Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate | 6.875% | 6.875% |  | 6.875% |  | 6.875%
Long-term Debt | $ 740,545 | $ 738,791 |  |  |  |
Parent Company [Member] | Senior Notes Due 2023 [Member] | Senior Notes | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding principal | 750,000 | 750,000 |  |  |  |
Parent Company [Member] | Senior Notes Due 2023 [Member] | Senior Notes | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 740,545 | 738,791 |  |  |  |
Parent Company [Member] | Senior Notes Due 2023 [Member] | Senior Notes | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Estimated Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument | $ 798,750 | $ 806,250 |  |  |  |
Parent Company [Member] | Senior Notes Due 2026 [Member] | Senior Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate | 6.375% | 6.375% | 6.375% | 6.375% |  |
Long-term Debt | $ 739,128 |  |  |  |  |
Parent Company [Member] | Senior Notes Due 2026 [Member] | Senior Notes | Fair Value, Inputs, Level 1 [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt |  | $ 737,926 |  |  |  |
Parent Company [Member] | Senior Notes Due 2026 [Member] | Senior Notes | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding principal | 750,000 | 750,000 |  |  |  |
Parent Company [Member] | Senior Notes Due 2026 [Member] | Senior Notes | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 739,128 |  |  |  |  |
Parent Company [Member] | Senior Notes Due 2026 [Member] | Senior Notes | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Estimated Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument | 810,000 | $ 804,375 |  |  |  |
Consolidated, Excluding Borgata [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Outstanding principal | 3,121,558 |  |  |  |  |
Consolidated, Excluding Borgata [Member] | Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Long-term Debt | 3,075,880 |  |  |  |  |
Consolidated, Excluding Borgata [Member] | Estimated Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument | $ 3,234,432 |  |  |  |  |
Peninsula | 8.375% Senior Notes due 2018 | Senior Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt instrument, stated interest rate |  |  |  |  | 8.375% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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