Real Estate and Accumulated Depreciation - Notes to Schedule III (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate
Balance at beginning of period	$ 7,158,069	$ 4,121,286	$ 3,893,799
Additions during the period:
TIER merger	0	2,222,989	0
Acquisitions	286,252	542,502	48,920
Improvements and other capitalized costs	323,919	271,720	178,567
Total Additions	610,171	3,037,211	227,487
Deductions during the period:
Cost of real estate sold	(383,010)	(428)	0
Total Deductions	(383,010)	(428)	0
Balance at end of period	7,385,230	7,158,069	4,121,286
Cumulative impairment charges on real estate assets owned at end of period	(14,829)	0	0
Balance at end of period before impairment charges	7,370,401	7,158,069	4,121,286
Accumulated Depreciation
Balance at beginning of period	621,617	421,495	275,977
Additions during the period:
Depreciation expense	234,057	200,122	145,518
Total Additions	234,057	200,122	145,518
Deductions during the period:
Cost of real estate sold	(44,478)	0	0
Total Deductions	(44,478)	0	0
Balance at end of period before impairment charges	811,196	$ 621,617	$ 421,495
Aggregate cost for federal income tax, net of depreciation	$ 5,200,000
Buildings and Improvements | Minimum
Deductions during the period:
Useful life	30 years
Buildings and Improvements | Maximum
Deductions during the period:
Useful life	42 years