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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment

5. Property and Equipment

Property and equipment consist of the following:

 

     As of December 31,  
     2017      2016  

Land

    $ 160,126      $ 127,769  

Land improvements

      25,630        23,158  

Buildings

      595,384        559,791  

Building and leasehold improvements

      117,460        105,168  

Equipment under capital leases

      5,937        5,943  

Computer equipment

      116,477        108,551  

Furniture, fixtures and equipment

      63,470        59,300  

Internally developed software

      36,173        30,407  

Other

      1,176        1,176  

Construction in progress

      32,390        19,112  
  

 

 

     

 

 

  
     1,154,223        1,040,375  

Less accumulated depreciation and amortization

      (231,939 )       (184,847 ) 
  

 

 

     

 

 

  

Property and equipment, net

    $ 922,284      $ 855,528  
  

 

 

     

 

 

  

 

Depreciation and amortization expense associated with property and equipment, including assets under capital lease, totaled $53,607, $44,829, and $34,821 for the years ended December 31, 2017, 2016, and 2015, respectively.