Property and Equipment

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment

Property and equipment were comprised of the following:

	December 31,
	2020		2019
Land	$	37,924	$	36,480
Buildings	400,616		392,256
Leasehold improvements	3,865,729		3,545,224
Equipment and information systems, including internally developed software	3,081,298		2,880,645
New center and capital asset projects in progress	616,686		588,345
	8,002,253		7,442,950
Less accumulated depreciation	(4,480,429)		(3,969,566)
	$	3,521,824	$	3,473,384

Depreciation and amortization expenses are computed using the straight-line method over the useful lives of the assets estimated as follows: buildings, 25 years to 40 years; leasehold improvements, the shorter of ten years or the expected lease term; and equipment and information systems, principally three years to 15 years. Depreciation expense on property and equipment was $616,626, $600,905, and $574,799 for 2020, 2019 and 2018, respectively.

Interest on debt incurred during the development of new centers and other capital asset projects is capitalized as a component of the asset cost based on the respective in-process capital asset balances. Interest capitalized was $17,944, $27,322 and $25,978 for 2020, 2019 and 2018, respectively.

During 2018, the Company recognized asset impairment charges of $17,338 related to the restructuring of its pharmacy business.