Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized discount	$ (2,152)	$ (2,702)
Unamortized Debt Issuance Expense	53,786	50,224
Current maturities of long-term debt	29,750	29,750
Long-term debt, gross, excluding current maturities	3,684,050	3,292,725
Long-term debt, net of current maturities and debt issuance costs	$ 3,628,112	3,239,799
Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%
Parent
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,753,275	2,309,725
Unamortized discount	(2,152)	(2,702)
Unamortized Debt Issuance Expense	39,025	29,724
Long-term debt, net	2,712,098	2,277,299
Current maturities of long-term debt	21,500	21,500
Long-term debt, net of current maturities and debt issuance costs	2,690,598	2,255,800
Parent \| Bank Credit Facility
Debt Instrument [Line Items]
Amount outstanding	903,275	$ 1,209,725
Remaining borrowing capacity	$ 592,900
Parent \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate at period end	3.885%	3.75%
Unamortized discount	$ (2,152)	$ (2,702)
Unamortized Debt Issuance Expense	8,134	9,746
Parent \| Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Unamortized discount	0	0
Unamortized Debt Issuance Expense	$ (6,250)	$ 7,044
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%
Parent \| Senior Notes \| 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Unamortized discount	$ 0	$ 0
Unamortized Debt Issuance Expense	$ 12,554	$ 12,934
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Parent \| Senior Notes \| 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 12,087
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Subsidiary, Peninsula Gaming [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 960,525	$ 1,012,750
Unamortized discount	0	0
Unamortized Debt Issuance Expense	14,761	20,500
Long-term debt, net	945,764	992,250
Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility
Debt Instrument [Line Items]
Amount outstanding	610,525	$ 662,750
Remaining borrowing capacity	$ 31,100
Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate at period end	4.25%	4.25%
Unamortized discount	$ 0	$ 0
Unamortized Debt Issuance Expense	(9,788)	14,143
Subsidiary, Peninsula Gaming [Member] \| Senior Notes \| Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Unamortized discount	0	0
Unamortized Debt Issuance Expense	$ (4,973)	$ 6,357
Debt Instrument, Interest Rate, Stated Percentage	8.38%	8.38%
Consolidated, Excluding Borgata [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 3,713,800	$ 3,322,475
Unamortized discount	(2,152)	(2,702)
Unamortized Debt Issuance Expense	53,786	50,224
Long-term debt, net	3,657,862	3,269,549
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Parent \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	903,275	1,209,725
Long-term debt, net	892,989	1,197,277
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Subsidiary, Peninsula Gaming [Member] \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	610,525	662,750
Long-term debt, net	600,737	648,607
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Subsidiary, Peninsula Gaming [Member] \| Senior Notes \| Peninsula Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	350,000	350,000
Long-term debt, net	345,027	343,643
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	350,000	350,000
Long-term debt, net	343,750	342,956
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000	750,000
Long-term debt, net	737,913	737,066
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross	750,000
Long-term debt, net	737,446
Fair Value, Measurements, Nonrecurring [Member] \| Level 3 \| Parent
Debt Instrument [Line Items]
Commitments, Fair Value Disclosure	34,301	35,126
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 3 \| Parent
Debt Instrument [Line Items]
Commitments, Fair Value Disclosure	28,371	28,381
Carrying Value \| Parent
Debt Instrument [Line Items]
Long-term debt, net	2,712,098	2,277,299
Carrying Value \| Subsidiary, Peninsula Gaming [Member]
Debt Instrument [Line Items]
Long-term debt, net	945,764	992,250
Carrying Value \| Consolidated, Excluding Borgata [Member]
Debt Instrument [Line Items]
Long-term debt, net	3,657,862	3,269,549
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 \| Parent \| Bank Credit Facility \| Bank Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, net		1,197,277
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term debt, net		342,956
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 \| Parent \| Senior Notes \| 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term debt, net		737,066
Carrying Value \| Fair Value, Measurements, Nonrecurring [Member] \| Level 3 \| Parent
Debt Instrument [Line Items]
Commitments, Fair Value Disclosure	$ 27,168	$ 27,660

Long-term Debt, Gross, Excluding Current Maturities

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Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate at the end of the reporting period.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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