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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of property and equipment [Abstract]    
Property and equipment, gross $ 74,155 $ 75,639
Less accumulated depreciation and amortization (70,618) (72,028)
Property and equipment, net 3,537 3,611
Construction in progress 777 1,012
Total 4,314 4,623
Office furniture and equipment    
Summary of property and equipment [Abstract]    
Property and equipment, gross 7,648 7,791
Computer hardware    
Summary of property and equipment [Abstract]    
Property and equipment, gross 5,209 7,100
Computer software    
Summary of property and equipment [Abstract]    
Property and equipment, gross 49,687 48,316
Automobiles    
Summary of property and equipment [Abstract]    
Property and equipment, gross 81 81
Leasehold improvements    
Summary of property and equipment [Abstract]    
Property and equipment, gross $ 11,530 $ 12,351