Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Property and Equipment, Net [Abstract]  
Property and Equipment, Net
Property and equipment, net as of December 31 are composed of the following:
  
2016
  
2015
 
       
Land
 
$
10,976
  
$
10,976
 
Buildings and leasehold improvements
  
64,828
   
63,967
 
Office furniture and equipment
  
24,234
   
22,869
 
Computer equipment and software
  
114,749
   
113,223
 
Automobiles
  
593
   
494
 
   
215,380
   
211,529
 
Less accumulated depreciation and amortization
  
149,011
   
137,576
 
Property and equipment, net
 
$
66,369
  
$
73,953