Credit Facilities, Net (Narrative) (Details)							1 Months Ended	12 Months Ended
	Nov. 12, 2021	Oct. 06, 2021	Oct. 04, 2021 $ / shares	Dec. 16, 2020 USD ($)	Aug. 10, 2020 USD ($)	Mar. 13, 2019 USD ($)	Nov. 30, 2020 USD ($) property	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Nov. 01, 2019 USD ($) property	Oct. 31, 2016 property
Line of Credit Facility [Line Items]
Real estate investments, at cost								$ 2,612,660,000	$ 2,621,723,000
Credit facilities, net								502,051,000	$ 674,551,000
Minimum cash, cash equivalents, and borrowing capacity								$ 50,000,000
Effective interest rate								3.00%	3.29%
Percent distribution in excess of modified funds from operations					95.00%
Stock repurchased, authorized amount					$ 50,000,000
Notional amount											$ 88,700,000
Sale and transfer of SHOPs | property							4
Repayments of credit facility borrowings								$ 298,804,000	$ 26,091,000	$ 368,300,000
Series A Preferred Stock
Line of Credit Facility [Line Items]
Preferred stock, dividend rate, percentage								7.375%	7.375%
Preferred stock, par value (in usd per share) | $ / shares								$ 0.01	$ 0.01
Series B Preferred Stock
Line of Credit Facility [Line Items]
Preferred stock, dividend rate, percentage		7.125%	7.125%					7.125%
Preferred stock, par value (in usd per share) | $ / shares			$ 0.01					$ 0.01
Commencement Quarter
Line of Credit Facility [Line Items]
Current borrowing capacity, base percent								62.50%
Covenant Period July 1, 2020 through June 30, 2021
Line of Credit Facility [Line Items]
Current borrowing capacity, base percent					67.50%
Covenant Period From July 1, 2021 through Commencement Quarter
Line of Credit Facility [Line Items]
Current borrowing capacity, base percent					65.00%
Covenant Period After Commencement Quarter
Line of Credit Facility [Line Items]
Current borrowing capacity, base percent					62.50%
Minimum | Commencement Quarter | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Floor interest rate					0.00%
Minimum | Covenant Period July 1, 2020 through March 31, 2021
Line of Credit Facility [Line Items]
Fixed charge coverage ratio					1.50
Minimum | Covenant Period From April 1, 2021 through June 30, 2021
Line of Credit Facility [Line Items]
Fixed charge coverage ratio					1.55
Minimum | Covenant Period after June 30 2021
Line of Credit Facility [Line Items]
Fixed charge coverage ratio	1.50				1.60
Minimum | Covenant Period After November 12, 2021
Line of Credit Facility [Line Items]
Fixed charge coverage ratio								1.50
Maximum | Commencement Quarter | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Floor interest rate					0.25%
Unencumbered Properties
Line of Credit Facility [Line Items]
Real estate investments, at cost								$ 110,400,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Repayments of credit facility borrowings				$ 17,600,000
Secured Debt
Line of Credit Facility [Line Items]
Remaining borrowing capacity								236,600,000
Secured Debt | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, increase limit						$ 370,000,000
Secured Debt | Maximum
Line of Credit Facility [Line Items]
Line of credit facility, increase limit						$ 1,000,000,000
Credit Facilities
Line of Credit Facility [Line Items]
Credit facilities, net								147,006,000	$ 319,376,000
Fannie Mae Master Credit Facilities
Line of Credit Facility [Line Items]
Real estate investments, at cost								600,000,000
Repayments of credit facility borrowings							$ 4,200,000
Fannie Mae Master Credit Facilities | Credit Facilities
Line of Credit Facility [Line Items]
Credit facilities, net								355,045,000	$ 355,175,000
New Credit Facilities
Line of Credit Facility [Line Items]
Real estate investments, at cost								1,000,000,000
New Credit Facilities | Day Prior to Commencement Quarter
Line of Credit Facility [Line Items]
Minimum cash, cash equivalents, and borrowing capacity								100,000,000
New Credit Facilities | Commencement Quarter
Line of Credit Facility [Line Items]
Minimum cash, cash equivalents, and borrowing capacity					$ 30,000,000
New Credit Facilities | Minimum | Commencement Quarter
Line of Credit Facility [Line Items]
Current borrowing capacity, base percent					55.00%
Fannie Credit Facility | Interest rate caps
Line of Credit Facility [Line Items]
Number of instruments | property											2	2
Interest rate cap												3.50%
Mortgage Notes Payable
Line of Credit Facility [Line Items]
Real estate investments pledged as collateral								$ 925,300,000
Effective interest rate								3.82%	3.94%
Term Loan
Line of Credit Facility [Line Items]
Extension period						1 year
Maximum borrowing capacity						$ 480,000,000
Term Loan | Minimum | Covenant Period August 10 2020 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					1.80%
Term Loan | Revolving Credit Facility | Minimum | Commencement Quarter | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					1.55%
Term Loan | Revolving Credit Facility | Minimum | Commencement Quarter | Base Rate
Line of Credit Facility [Line Items]
Interest rate					0.30%
Term Loan | Revolving Credit Facility | Minimum | Covenant Period August 10 2020 | Base Rate
Line of Credit Facility [Line Items]
Interest rate					0.55%
Term Loan | Revolving Credit Facility | Maximum | Commencement Quarter | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					2.30%
Term Loan | Revolving Credit Facility | Maximum | Commencement Quarter | Base Rate
Line of Credit Facility [Line Items]
Interest rate					1.05%
Term Loan | Revolving Credit Facility | Maximum | Covenant Period August 10 2020 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					2.55%
Term Loan | Revolving Credit Facility | Maximum | Covenant Period August 10 2020 | Base Rate
Line of Credit Facility [Line Items]
Interest rate					1.30%
Term Loan | Credit Facilities
Line of Credit Facility [Line Items]
Credit facilities, net								$ 150,000,000	$ 150,000,000
Effective interest rate								4.11%	4.95%
Credit Facilities
Line of Credit Facility [Line Items]
Minimum net worth required for compliance					$ 1,200,000
Net offering proceeds, percent					75.00%
Consolidated tangible net worth								$ 1,600,000
Credit Facilities | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity						$ 630,000,000
Credit facilities, net								$ 0	$ 173,674,000
Effective interest rate								0.00%	3.21%
Credit Facilities | Revolving Credit Facility | Minimum | Commencement Quarter | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					1.60%
Credit Facilities | Revolving Credit Facility | Minimum | Commencement Quarter | Base Rate
Line of Credit Facility [Line Items]
Interest rate					0.35%
Credit Facilities | Revolving Credit Facility | Minimum | Covenant Period August 10 2020 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					1.85%
Credit Facilities | Revolving Credit Facility | Minimum | Covenant Period August 10 2020 | Base Rate
Line of Credit Facility [Line Items]
Interest rate					0.60%
Credit Facilities | Revolving Credit Facility | Maximum | Commencement Quarter | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					2.35%
Credit Facilities | Revolving Credit Facility | Maximum | Commencement Quarter | Base Rate
Line of Credit Facility [Line Items]
Interest rate					1.10%
Credit Facilities | Revolving Credit Facility | Maximum | Covenant Period August 10 2020 | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Interest rate					2.60%
Credit Facilities | Revolving Credit Facility | Maximum | Covenant Period August 10 2020 | Base Rate
Line of Credit Facility [Line Items]
Interest rate					1.35%