Schedule III - Real Estate and Accumulated Depreciation - Activity in Real Estate Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real estate, gross:
Balance at end of year	$ 10,702,399
Accumulated depreciation:
Balance at end of year	1,867,750
Net real estate assets:
Net non-lease real estate assets	8,834,649	$ 7,893,802	$ 7,696,864
Aggregate cost of real estate for U.S. federal income tax purposes	8,865,491
Operating facilities
Real estate, gross:
Balance at beginning of year	9,507,788	9,129,558	8,709,315
Acquisitions	1,500,703	255,235	303,588
Improvements	80,131	66,693	68,459
Transfers from construction in progress (to operating facilities)	62,462	40,988	59,614
Dispositions and other	(507,362)	15,314	(11,418)
Balance at end of year	10,643,722	9,507,788	9,129,558
Accumulated depreciation:
Balance at beginning of year	1,681,429	1,473,851	1,262,438
Depreciation expense	230,445	217,364	212,202
Dispositions and other	(43,553)	(9,786)	(789)
Balance at end of year	1,868,321	1,681,429	1,473,851
Real estate under development/redevelopment
Real estate, gross:
Balance at beginning of year	67,443	41,157	44,954
Current development	54,267	67,274	55,817
Transfers from construction in progress (to operating facilities)	(62,462)	(40,988)	(59,614)
Dispositions and other	0	0	0
Balance at end of year	59,248	$ 67,443	$ 41,157
Right of use asset - finance lease
Real estate, gross:
Balance at end of year	117,718
Accumulated depreciation:
Balance at end of year	$ 3,049