Dispositions (Details) $ in Thousands				1 Months Ended			3 Months Ended				9 Months Ended
	Sep. 16, 2021 USD ($) hotel_room	May 07, 2021 USD ($) a	Jul. 16, 2020 USD ($) hotel_room	Jul. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) ft² a parking_space	Nov. 30, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) hotel_room	Mar. 31, 2020 USD ($) parking_space	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Carrying value							$ 6,865,357				$ 6,865,357		$ 6,685,069
Operating losses							(49,135)	$ 14,009			(39,718)	$ 151,640
Net investment in lease receivable							2,915				2,915		$ 2,926
Proceeds from the sale of lease receivable											0	64,155
Mr. C Seaport
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage									35.00%
Equity method investment, proceeds from sale									$ 800
Equity Method Investments | Mr. C Seaport
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of hotel rooms | hotel_room									66
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hotel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received	$ 252,000
Number of hotel rooms | hotel_room	909
Carrying value	$ 210,000
Gain on disposal	39,100
Transaction costs	2,900
Repayments of debt	$ 132,300
Operating losses							$ 1,200	$ 3,100			$ 6,300	8,400
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Equity Method Investments | Mr. C Seaport
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of hotel rooms | hotel_room			66
Equity method investment, ownership percentage			35.00%
Equity method investment, proceeds from sale			$ 800
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Monarch City
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received		$ 51,400
Carrying value		28,700
Gain on disposal		$ 21,300
Area of land sold | a		229
Transaction costs on sales of investments real estate		$ 1,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West Windsor New Jersey
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal				$ 8,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lakeside Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received					$ 115,000					$ 115,000
Gain on disposal										$ 38,300
Area of land sold | a					13.5
Transaction costs on sales of investments real estate					$ 200
Square footage of buildings sold (in sqft) | ft²					203,257
Number of parking spaces | parking_space					550					550
Sales-type lease, derecognized developments						$ 63,700
Net investment in lease receivable					$ 76,100	75,900				$ 76,100
Selling profit from sales-type leases						$ 13,500
Payments to acquire real estate					$ 600
Proceeds from the sale of lease receivable												$ 64,200