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Fair Value Measurements (Fair Value Balance Sheet Long-Term Debt Grouping) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	May 21, 2015	Aug. 16, 2012	Nov. 10, 2010
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal		$ 3,322,475
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt		3,269,549
Fair Value, Measurements, Nonrecurring [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument		3,366,251
Parent Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal	$ 3,283,129	2,309,725
Long-term debt		2,277,299
Parent Company [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt		2,277,299
Parent Company [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument		2,348,120
Parent Company [Member] | Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	591
Parent Company [Member] | Other | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal	591
Parent Company [Member] | Bank Credit Facility | Bank Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal		1,209,725
Long-term debt	1,752,147	1,197,277
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	1,782,538
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	1,752,147	1,197,277
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	1,791,853	1,202,870
Parent Company [Member] | 9.125% Senior Notes Due 2018 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, stated interest rate					9.125%
Parent Company [Member] | 9.125% Senior Notes Due 2018 | 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	738,791	342,956
Parent Company [Member] | 9.125% Senior Notes Due 2018 | 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	$ 806,250	$ 372,750
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%	6.88%	6.875%		6.875%
Outstanding principal		$ 750,000
Long-term debt	$ 738,791	737,066
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
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	737,926
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	804,375
Parent Company [Member] | Holdco Note | 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	591
Parent Company [Member] | Holdco Note | 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	591
Consolidated, Excluding Borgata [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal	3,283,129	3,322,475
Long-term debt		3,269,549
Consolidated, Excluding Borgata [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,229,455
Consolidated, Excluding Borgata [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument	$ 3,403,069
Peninsula
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal		1,012,750
Long-term debt		992,250
Peninsula | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt		992,250
Peninsula | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument		1,018,131
Peninsula | Bank Credit Facility | Bank Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Outstanding principal		662,750
Long-term debt		648,607
Peninsula | 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		648,607
Peninsula | 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		$ 661,131
Peninsula | 8.375% Senior Notes due 2018 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, stated interest rate		8.38%		8.375%
Outstanding principal		$ 350,000
Long-term debt		343,643
Peninsula | 8.375% Senior Notes due 2018 | Senior Notes | 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		343,643
Peninsula | 8.375% Senior Notes due 2018 | Senior Notes | 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		$ 357,000

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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
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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