Real Estate Properties - Allocation of Purchase Price (Details) $ in Thousands									12 Months Ended
	Mar. 12, 2020 USD ($) ft²	Oct. 09, 2019 USD ($) room	Sep. 20, 2019 USD ($) ft² industry brand state retailProperty tenant	Aug. 01, 2019 USD ($)	May 07, 2019 USD ($) room	Feb. 22, 2019 USD ($) room	Oct. 30, 2018 USD ($) room	Jun. 15, 2018 USD ($) room	Dec. 31, 2020 USD ($) ft² room	Dec. 31, 2019 USD ($) state	Dec. 31, 2018 USD ($)
Real Estate Properties [Line Items]
Square Feet | ft²									46,799
Purchase Price			$ 2,482,382								$ 127,597
Land											10,888
Land Improvements											1,006
Building and Improvements											107,128
Furniture, Fixtures and Equipment											8,575
Held For Sale											0
Intangible Assets											$ 0
Number of properties acquired | retailProperty			767
Rentable square feet | ft²			12,400,000
Number of states in which property is located | state			45							12
Cash consideration			$ 2,384,577
Prepayment penalties			82,069
Acquisition costs capitalized			$ 15,736
Number of tenants | tenant			279
Number of industries | industry			23
Number of brands | brand			163
Unspent leasing related obligations assumed									$ 4,399
Hotel
Real Estate Properties [Line Items]
Rooms | room									430
Square Feet | ft²	6,696
Purchase Price	$ 7,071									$ 2,711,985
Land	880									444,260
Land Improvements	0									1,204
Building and Improvements	5,363									1,365,525
Furniture, Fixtures and Equipment	0									8,593
Held For Sale	0									604,989
Intangible Assets	$ 828									$ 287,414
Washington, DC | Hotel
Real Estate Properties [Line Items]
Rooms | room						335
Purchase Price						$ 143,742
Land						44,972
Land Improvements						151
Building and Improvements						93,412
Furniture, Fixtures and Equipment						5,207
Held For Sale						0
Intangible Assets						$ 0
Milwaukee, WI | Hotel
Real Estate Properties [Line Items]
Rooms | room					198
Purchase Price					$ 30,235
Land					3,442
Land Improvements					1,053
Building and Improvements					25,132
Furniture, Fixtures and Equipment					608
Held For Sale					0
Intangible Assets					$ 0
Southington, CT | Hotel
Real Estate Properties [Line Items]
Purchase Price				$ 66
Land				66
Land Improvements				0
Building and Improvements				0
Furniture, Fixtures and Equipment				0
Held For Sale				0
Intangible Assets				$ 0
Various | Hotel
Real Estate Properties [Line Items]
Square Feet | ft²			12,372,762
Purchase Price			$ 2,482,382
Land			388,057
Land Improvements			0
Building and Improvements			1,201,922
Furniture, Fixtures and Equipment			0
Held For Sale			604,989
Intangible Assets			$ 287,414
Chicago, IL | Hotel
Real Estate Properties [Line Items]
Rooms | room		261
Purchase Price		$ 55,560
Land		7,723
Land Improvements		0
Building and Improvements		45,059
Furniture, Fixtures and Equipment		2,778
Held For Sale		0
Intangible Assets		$ 0
Minneapolis, MN | Hotel
Real Estate Properties [Line Items]
Rooms | room								360
Purchase Price								$ 75,576
Land								2,196
Land Improvements								0
Building and Improvements								68,388
Furniture, Fixtures and Equipment								4,992
Held For Sale								0
Intangible Assets								$ 0
Baton Rouge, LA | Hotel
Real Estate Properties [Line Items]
Rooms | room								117
Purchase Price								$ 16,022
Land								2,242
Land Improvements								173
Building and Improvements								12,842
Furniture, Fixtures and Equipment								765
Held For Sale								0
Intangible Assets								$ 0
Scottsdale, AZ | Hotel
Real Estate Properties [Line Items]
Rooms | room							164
Purchase Price							$ 35,999
Land							6,450
Land Improvements							833
Building and Improvements							25,898
Furniture, Fixtures and Equipment							2,818
Held For Sale							0
Intangible Assets							$ 0