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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 106,488 $ 96,363
Finite-Lived Intangible Assets, Accumulated Amortization 72,913 63,820
Intangible assets, net 33,575 32,543
Capitalized software costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 67,106 63,260
Finite-Lived Intangible Assets, Accumulated Amortization 53,096 49,072
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 31,936 26,618
Finite-Lived Intangible Assets, Accumulated Amortization 16,336 12,817
Backlog and non-compete agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 2,371 1,623
Finite-Lived Intangible Assets, Accumulated Amortization 2,039 1,142
Acquired technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 5,075 4,862
Finite-Lived Intangible Assets, Accumulated Amortization $ 1,442 $ 789