SEGMENT INFORMATION - Revenue and Net Real Estate Property (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenues:
Total revenues	$ 1,037,276	$ 976,078	$ 3,077,768	$ 2,805,563
Net Real Estate Property:
Total net real estate property	21,277,933		21,277,933		$ 21,816,838
United States
Revenues:
Total revenues	918,106	859,524	2,719,097	2,460,534
Net Real Estate Property:
Total net real estate property	18,345,417		18,345,417		18,562,738
Canada
Revenues:
Total revenues	112,550	109,046	337,503	322,422
Net Real Estate Property:
Total net real estate property	2,736,339		2,736,339		3,007,008
United Kingdom
Revenues:
Total revenues	6,620	$ 7,508	21,168	$ 22,607
Net Real Estate Property:
Total net real estate property	$ 196,177		$ 196,177		$ 247,092