Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 33,237 $ 30,258  
Less - accumulated depreciation (27,934) (25,240)  
Property and equipment, net 5,303 5,018  
Depreciation of property and equipment 2,394 3,020 $ 3,263
Furniture and office equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 5,846 5,429  
Computer equipment and software costs      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 21,457 19,475  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3,255 2,819  
Automobiles      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,181 1,156  
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,498 $ 1,379