Segment Information (Geographic Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Revenues	$ 3,828,007	$ 3,795,357	$ 3,872,750
Net real estate property:
Net real estate property	21,816,838	20,550,035
United States
Revenue
Revenues	3,363,197	3,381,357	3,578,341
Net real estate property:
Net real estate property	18,562,738	17,303,816
Canada
Revenue
Revenues	434,862	389,205	266,946
Net real estate property:
Net real estate property	3,007,008	2,983,924
United Kingdom
Revenue
Revenues	29,948	24,795	$ 27,463
Net real estate property:
Net real estate property	$ 247,092	$ 262,295