Property and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment

Property and equipment were comprised of the following:

	December 31,
	2018			2017
Land	$	37,384		$	33,814
Buildings	467,181			473,489
Leasehold improvements	3,164,943			2,816,675
Equipment and information systems, including internally developed software	2,586,564			2,352,246
New center and capital asset projects in progress	661,695			576,651
	6,917,767			6,252,875
Less accumulated depreciation	(3,524,098		)	(3,103,662		)
	$	3,393,669		$	3,149,213

Depreciation expense on property and equipment was $574,799, $544,129, and $494,945 for 2018, 2017 and 2016, respectively.

During 2018 and 2017, the Company recognized asset impairment charges of $17,338 and $15,168, respectively, related to the restructuring of its pharmacy business.

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 $25,978, $19,176 and $12,990 for 2018, 2017 and 2016, respectively.