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INTERNALLY DEVELOPED SOFTWARE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Capitalized software development costs      
Amounts capitalized, beginning of year $ 75,972 $ 68,862  
Development costs capitalized 9,544 7,154  
Dispositions (1,974) (44)  
Amounts capitalized, end of year 83,542 75,972 $ 68,862
Accumulated amortization, end of year (67,571) (61,259)  
Internally developed software, net 15,971 14,713  
Capitalized software development costs for projects in progress 4,700 1,000  
Amortization expense recognized related to capitalized software development costs $ 8,300 $ 8,600 $ 8,800