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Property and equipment
12 Months Ended
Dec. 31, 2015
Property Plant And Equipment [Abstract]  
Property and equipment

6.

Property and equipment

Property and equipment were comprised of the following:

 

 

 

December 31,

 

 

 

2015

 

 

2014

 

Land

 

$

42,080

 

 

$

35,885

 

Buildings

 

 

437,283

 

 

 

387,621

 

Leasehold improvements

 

 

2,289,425

 

 

 

2,002,735

 

Equipment and information systems, including internally

   developed software

 

 

2,080,446

 

 

 

1,836,704

 

New center and capital asset projects in progress

 

 

336,513

 

 

 

235,660

 

 

 

 

5,185,747

 

 

 

4,498,605

 

Less accumulated depreciation

 

 

(2,397,007

)

 

 

(2,029,506

)

 

 

$

2,788,740

 

 

$

2,469,099

 

 

Depreciation expense on property and equipment was $475,484, $428,309 and $373,107 for 2015, 2014 and 2013, 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 $9,723, $7,888 and $6,408 for 2015, 2014 and 2013, respectively.