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6. PROPERTY AND EQUIPMENT
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT

Property and equipment and accumulated depreciation and amortization are as follows (in thousands):

 

   December 31, 
   2017   2016 
Land  $250   $250 
Medical equipment   380,439    393,001 
Computer and office equipment, furniture and fixtures   96,382    99,434 
Software development costs   6,391    6,391 
Leasehold improvements   273,436    252,595 
Equipment under capital lease   17,180    26,758 
Total property and equipment cost   774,078    778,429 
Accumulated depreciation   (529,511)   (529,648)
Total net property and equipment   244,567    248,781 
Equipment transferred to other assets   (266)   (1,056)
Total property and equipment  $244,301   $247,725 

 

Depreciation and amortization expense of property and equipment, including amortization of equipment under capital leases, for the years ended December 31, 2017, 2016 and 2015 was $64.2 million, $64.0 million, and $57.6 million, respectively.