Schedule III Part II - Summary of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements [Abstract]
Balance at beginning of year	$ 7,819,472	$ 7,635,061	$ 6,759,073
Acquisitions	309,921	14,940	555,476
Improvements	441,703	407,225	492,541
Deduction during period—dispositions and retirements of property	(201,105)	(237,754)	(172,029)
Balance at end of year	8,298,132	7,819,472	7,635,061
Aggregate cost basis for Federal tax purposes	7,400,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	2,059,143	1,876,544	1,729,234
Additions during period—depreciation and amortization expense	215,382	215,969	193,340
Deductions during period—dispositions and retirements of property	(40,939)	(33,370)	(46,030)
Balance at end of year	2,215,413	$ 2,059,143	$ 1,876,544
Accounting Standards Update 2016-02
January 1, 2019 adoption of new accounting standard - See Note 2	(71,859)
January 1, 2019 adoption of new accounting standard - See Note 2	$ (18,173)