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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and equipment
Property and equipment were comprised of the following:
 
December 31,
 
2017
 
2016
Land
$
33,814

 
$
26,339

Buildings
473,489

 
429,039

Leasehold improvements
2,816,675

 
2,495,070

Equipment and information systems, including internally developed software
2,352,246

 
2,182,912

New center and capital asset projects in progress
576,651

 
429,037

 
6,252,875

 
5,562,397

Less accumulated depreciation
(3,103,662
)
 
(2,698,276
)
 
$
3,149,213

 
$
2,864,121


Depreciation expense on property and equipment was $544,129, $494,945, and $444,720 for 2017, 2016 and 2015, respectively.
In addition, during the first quarter of 2017, the Company recognized an asset impairment charge of $15,168 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 $19,176, $12,990 and $9,723 for 2017, 2016 and 2015, respectively.