Schedule III Real Estate and Accumulated Depreciation - Rollforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property
Balance, beginning of year	$ 2,083,205	$ 1,821,217	$ 1,643,576
Additions - property acquisitions	26,174	7,474	12,158
Additions - improvements	369,419	254,514	165,483
Balance, end of year	2,478,798	2,083,205	1,821,217
Accumulated Depreciation
Balance, beginning of year	590,784	473,141	369,303
Additions, net of disposals	129,714	117,643	103,838
Balance, end of year	$ 720,498	$ 590,784	$ 473,141