Supplementary Condensed Consolidating Financial Information of Parent Guarantor and Subsidiary Issuers (Income Statement) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Rental income	$ 248,563,000				$ 496,241,000
Rental income			$ 169,865,000			$ 339,270,000
Income from direct financing lease			26,984,000			45,605,000
Interest income from mortgaged real estate	7,201,000		0		14,394,000	0
Real estate taxes paid by tenants			21,483,000			42,761,000
Total revenues	289,013,000		254,221,000		576,877,000	498,271,000
Operating expenses
Gaming, food, beverage and other	19,168,000		20,407,000		38,190,000	40,065,000
Real estate taxes			21,800,000			43,395,000
Land rights and ground lease expense	15,229,000		6,444,000		24,478,000	12,976,000
General and administrative	15,984,000		24,806,000		33,224,000	41,266,000
Depreciation	67,865,000		27,523,000		126,443,000	55,477,000
Loan impairment charges	0		0		13,000,000	0
Total operating expenses	118,246,000		100,980,000		235,335,000	193,179,000
Income from operations	170,767,000		153,241,000		341,542,000	305,092,000
Other income (expenses)
Interest expense	(76,523,000)		(57,055,000)		(153,251,000)	(111,123,000)
Interest income	248,000		891,000		337,000	1,372,000
Losses on debt extinguishment	0		(3,473,000)		0	(3,473,000)
Intercompany dividends and interest	0		0		0	0
Total other expenses	(76,275,000)		(59,637,000)		(152,914,000)	(113,224,000)
Income before income taxes	94,492,000		93,604,000		188,628,000	191,868,000
Income tax expense	1,459,000		1,606,000		2,585,000	3,098,000
Net income	93,033,000	$ 93,010,000	91,998,000	$ 96,772,000	186,043,000	188,770,000
Eliminations
Revenues
Rental income	0				0
Rental income			0			0
Income from direct financing lease			0			0
Interest income from mortgaged real estate	0				0
Real estate taxes paid by tenants			0			0
Total revenues	0		0		0	0
Operating expenses
Gaming, food, beverage and other	0		0		0	0
Real estate taxes			0			0
Land rights and ground lease expense	0		0		0	0
General and administrative	0		0		0	0
Depreciation	0		0		0	0
Loan impairment charges					0
Total operating expenses	0		0		0	0
Income from operations	0		0		0	0
Other income (expenses)
Interest expense	0		0		0	0
Interest income	0		0		0	0
Losses on debt extinguishment			0			0
Intercompany dividends and interest	(133,513,000)		(114,886,000)		(251,336,000)	(221,674,000)
Total other expenses	(133,513,000)		(114,886,000)		(251,336,000)	(221,674,000)
Income before income taxes	(133,513,000)		(114,886,000)		(251,336,000)	(221,674,000)
Income tax expense	0		0		0	0
Net income	(133,513,000)		(114,886,000)		(251,336,000)	(221,674,000)
Parent Guarantor
Revenues
Rental income	0				0
Rental income			0			0
Income from direct financing lease			0			0
Interest income from mortgaged real estate	0				0
Real estate taxes paid by tenants			0			0
Total revenues	0		0		0	0
Operating expenses
Gaming, food, beverage and other	0		0		0	0
Real estate taxes			0			0
Land rights and ground lease expense	0		0		0	0
General and administrative	0		0		0	0
Depreciation	0		0		0	0
Loan impairment charges					0
Total operating expenses	0		0		0	0
Income from operations	0		0		0	0
Other income (expenses)
Interest expense	0		0		0	0
Interest income	0		0		0	0
Losses on debt extinguishment			0			0
Intercompany dividends and interest	0		0		0	0
Total other expenses	0		0		0	0
Income before income taxes	0		0		0	0
Income tax expense	0		0		0	0
Net income	0		0		0	0
Subsidiary Issuers
Revenues
Rental income	138,135,000				276,388,000
Rental income			101,767,000			203,587,000
Income from direct financing lease			0			0
Interest income from mortgaged real estate	5,590,000				11,181,000
Real estate taxes paid by tenants			11,176,000			22,076,000
Total revenues	143,725,000		112,943,000		287,569,000	225,663,000
Operating expenses
Gaming, food, beverage and other	0		0		0	0
Real estate taxes			11,195,000			22,114,000
Land rights and ground lease expense	10,770,000		1,929,000		15,494,000	3,948,000
General and administrative	10,335,000		19,016,000		21,847,000	29,937,000
Depreciation	38,911,000		23,190,000		67,698,000	46,791,000
Loan impairment charges					0
Total operating expenses	60,016,000		55,330,000		105,039,000	102,790,000
Income from operations	83,709,000		57,613,000		182,530,000	122,873,000
Other income (expenses)
Interest expense	(76,523,000)		(57,055,000)		(153,251,000)	(111,123,000)
Interest income	248,000		404,000		337,000	404,000
Losses on debt extinguishment			(3,473,000)			(3,473,000)
Intercompany dividends and interest	128,514,000		109,988,000		247,908,000	217,091,000
Total other expenses	52,239,000		49,864,000		94,994,000	102,899,000
Income before income taxes	135,948,000		107,477,000		277,524,000	225,772,000
Income tax expense	196,000		228,000		265,000	399,000
Net income	135,752,000		107,249,000		277,259,000	225,373,000
Other Subsidiary Non-Issuers
Revenues
Rental income	110,428,000				219,853,000
Rental income			68,098,000			135,683,000
Income from direct financing lease			26,984,000			45,605,000
Interest income from mortgaged real estate	1,611,000				3,213,000
Real estate taxes paid by tenants			10,307,000			20,685,000
Total revenues	145,288,000		141,278,000		289,308,000	272,608,000
Operating expenses
Gaming, food, beverage and other	19,168,000		20,407,000		38,190,000	40,065,000
Real estate taxes			10,605,000			21,281,000
Land rights and ground lease expense	4,459,000		4,515,000		8,984,000	9,028,000
General and administrative	5,649,000		5,790,000		11,377,000	11,329,000
Depreciation	28,954,000		4,333,000		58,745,000	8,686,000
Loan impairment charges					13,000,000
Total operating expenses	58,230,000		45,650,000		130,296,000	90,389,000
Income from operations	87,058,000		95,628,000		159,012,000	182,219,000
Other income (expenses)
Interest expense	0		0		0	0
Interest income	0		487,000		0	968,000
Losses on debt extinguishment			0			0
Intercompany dividends and interest	4,999,000		4,898,000		3,428,000	4,583,000
Total other expenses	4,999,000		5,385,000		3,428,000	5,551,000
Income before income taxes	92,057,000		101,013,000		162,440,000	187,770,000
Income tax expense	1,263,000		1,378,000		2,320,000	2,699,000
Net income	90,794,000		99,635,000		160,120,000	185,071,000
Real Estate
Revenues
Total revenues	255,764,000		218,332,000		510,635,000	427,636,000
Real Estate | Eliminations
Revenues
Total revenues	0		0		0	0
Real Estate | Parent Guarantor
Revenues
Total revenues	0		0		0	0
Real Estate | Subsidiary Issuers
Revenues
Total revenues	143,725,000		112,943,000		287,569,000	225,663,000
Real Estate | Other Subsidiary Non-Issuers
Revenues
Total revenues	112,039,000		105,389,000		223,066,000	201,973,000
Gaming, food, beverage and other
Revenues
Total revenues	33,249,000		35,889,000		66,242,000	70,635,000
Gaming, food, beverage and other | Eliminations
Revenues
Total revenues	0		0		0	0
Gaming, food, beverage and other | Parent Guarantor
Revenues
Total revenues	0		0		0	0
Gaming, food, beverage and other | Subsidiary Issuers
Revenues
Total revenues	0		0		0	0
Gaming, food, beverage and other | Other Subsidiary Non-Issuers
Revenues
Total revenues	$ 33,249,000		$ 35,889,000		$ 66,242,000	$ 70,635,000