Joint Ventures - Unconsolidated JV - Watersound Fountains Independent Living JV (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2021 USD ($) item	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Investments
Net income (loss)		$ 24,024	$ 19,219	$ 26,981	$ 17,884
Summarized financial information
Investment in real estate		601,589		601,589			$ 551,653
Cash and cash equivalents		33,336	106,039	33,336	106,039		106,794
Other assets		73,001		73,001			65,866
Total assets		1,102,005		1,102,005			1,037,324
Other liabilities		87,514		87,514			72,035
Equity		588,515	$ 542,650	588,515	$ 542,650	$ 568,104	568,170	$ 520,910	$ 529,670
Total liabilities and equity		1,102,005		1,102,005			$ 1,037,324
Watersound Fountains Independent Living JV
Investments
Value of land contributed	$ 3,200
Cash contributed				4,300
Cash contributed by JV partner		6,400		6,400
Net income (loss)		$ 0		$ 0
Ownership percentage		53.80%		53.80%
Watersound Fountains Independent Living JV
Investments
Number of JV partners | item	3
Summarized financial information
Investment in real estate		$ 7,517		$ 7,517
Cash and cash equivalents		6,740		6,740
Other assets		208		208
Total assets		14,465		14,465
Other liabilities		509		509
Equity		13,956		13,956
Total liabilities and equity		$ 14,465		$ 14,465
Watersound Fountains Independent Living JV | Senior living community
Investments
Number of units to be developed | item	148