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New Accounting Pronouncements - Cumulative Effect on Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cumulative effect of adoption
Revenues	$ 826,913		$ 1,642,998
Less promotional allowances		$ (45,983)		$ (87,841)
Net revenues	826,913	796,463	1,642,998	1,572,687
Operating expenses
General and administrative	132,659	130,096	253,922	255,911
Depreciation and amortization	58,559	68,969	118,949	139,205
(Recovery) provision for loan loss and unfunded loan commitments to the JIVDC and impairment losses	(16,985)	5,635	(16,367)	5,635
Insurance recoveries	(68)		(68)
Total operating expenses	645,158	661,474	1,289,109	1,297,411
Income from operations	181,755	134,989	353,889	275,276
Income from operations before income taxes	69,230	23,304	130,356	30,606
Income tax provision (benefit)	15,242	6,225	30,931	8,423
Net income	53,988	17,079	99,425	22,183
Gaming
Cumulative effect of adoption
Revenues	665,094		1,319,588
Operating expenses
Operating expenses	350,694	345,156	691,210	677,209
Food, beverage, hotel and other
Cumulative effect of adoption
Revenues	133,664		264,633
Operating expenses
Operating expenses	95,112	105,231	188,092	206,306
Management service fees
Cumulative effect of adoption
Revenues	2,968		5,406
Reimbursable management costs
Cumulative effect of adoption
Revenues	25,187		53,371
Operating expenses
Operating expenses	25,187	$ 6,387	53,371	$ 13,145
Balances Without Adoption of ASC 606
Cumulative effect of adoption
Revenues	857,273		1,699,249
Less promotional allowances	(42,154)		(82,417)
Net revenues	815,119		1,616,832
Operating expenses
General and administrative	132,659		253,922
Depreciation and amortization	58,559		118,949
(Recovery) provision for loan loss and unfunded loan commitments to the JIVDC and impairment losses	(16,985)		(16,367)
Insurance recoveries	(68)		(68)
Total operating expenses	633,548		1,263,587
Income from operations	181,571		353,245
Income from operations before income taxes	69,046		129,712
Income tax provision (benefit)	15,202		30,778
Net income	53,844		98,934
Balances Without Adoption of ASC 606 \| Gaming
Cumulative effect of adoption
Revenues	699,955		1,386,669
Operating expenses
Operating expenses	350,286		689,774
Balances Without Adoption of ASC 606 \| Food, beverage, hotel and other
Cumulative effect of adoption
Revenues	150,231		296,715
Operating expenses
Operating expenses	104,978		206,918
Balances Without Adoption of ASC 606 \| Management service fees
Cumulative effect of adoption
Revenues	2,968		5,406
Balances Without Adoption of ASC 606 \| Reimbursable management costs
Cumulative effect of adoption
Revenues	4,119		10,459
Operating expenses
Operating expenses	4,119		10,459
ASU 2014-09 \| Effect of Change Higher / (Lower)
Cumulative effect of adoption
Revenues	(30,360)		(56,251)
Less promotional allowances	42,154		82,417
Net revenues	11,794		26,166
Operating expenses
Total operating expenses	11,610		25,522
Income from operations	184		644
Income from operations before income taxes	184		644
Income tax provision (benefit)	40		153
Net income	144		491
ASU 2014-09 \| Effect of Change Higher / (Lower) \| Gaming
Cumulative effect of adoption
Revenues	(34,861)		(67,081)
Operating expenses
Operating expenses	408		1,436
ASU 2014-09 \| Effect of Change Higher / (Lower) \| Food, beverage, hotel and other
Cumulative effect of adoption
Revenues	(16,567)		(32,082)
Operating expenses
Operating expenses	(9,866)		(18,826)
ASU 2014-09 \| Effect of Change Higher / (Lower) \| Reimbursable management costs
Cumulative effect of adoption
Revenues	21,068		42,912
Operating expenses
Operating expenses	21,068		42,912
ASU 2014-09 \| Loyalty Point Impact
Cumulative effect of adoption
Revenues	(592)		(2,080)
Net revenues	(592)		(2,080)
Operating expenses
Total operating expenses	(408)		(1,436)
Income from operations	(184)		(644)
Income from operations before income taxes	(184)		(644)
Income tax provision (benefit)	(40)		(153)
Net income	(144)		(491)
ASU 2014-09 \| Loyalty Point Impact \| Gaming
Cumulative effect of adoption
Revenues	(563)		(1,982)
Operating expenses
Operating expenses	(408)		(1,436)
ASU 2014-09 \| Loyalty Point Impact \| Food, beverage, hotel and other
Cumulative effect of adoption
Revenues	(29)		(98)
ASU 2014-09 \| Promotional Allowance Discretionary Complimentaries Impact
Cumulative effect of adoption
Revenues	35,424		69,063
Less promotional allowances	(35,424)		(69,063)
ASU 2014-09 \| Promotional Allowance Discretionary Complimentaries Impact \| Gaming
Cumulative effect of adoption
Revenues	35,424		69,063
ASU 2014-09 \| Promotional Allowance Point Redemption Impact
Cumulative effect of adoption
Revenues	6,730		13,354
Less promotional allowances	(6,730)		(13,354)
ASU 2014-09 \| Promotional Allowance Point Redemption Impact \| Food, beverage, hotel and other
Cumulative effect of adoption
Revenues	6,730		13,354
ASU 2014-09 \| Reimbursable Expense - Casino Rama Impact
Cumulative effect of adoption
Revenues	(21,068)		(42,912)
Net revenues	(21,068)		(42,912)
Operating expenses
Total operating expenses	(21,068)		(42,912)
ASU 2014-09 \| Reimbursable Expense - Casino Rama Impact \| Reimbursable management costs
Cumulative effect of adoption
Revenues	(21,068)		(42,912)
Operating expenses
Operating expenses	(21,068)		(42,912)
ASU 2014-09 \| Racing Revenue Impact
Cumulative effect of adoption
Revenues	9,866		18,826
Net revenues	9,866		18,826
Operating expenses
Total operating expenses	9,866		18,826
ASU 2014-09 \| Racing Revenue Impact \| Food, beverage, hotel and other
Cumulative effect of adoption
Revenues	9,866		18,826
Operating expenses
Operating expenses	$ 9,866		$ 18,826