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INTANGIBLE ASSETS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets, Gross $ 77,254 $ 68,408
Finite-Lived Intangible Assets, Accumulated Amortization 47,593 41,007
Intangible assets, net 29,661 27,401
Capitalized software costs [Member]
    
Finite-Lived Intangible Assets, Gross 54,599 49,723
Finite-Lived Intangible Assets, Accumulated Amortization 41,191 37,370
Customer relationships [Member]
    
Finite-Lived Intangible Assets, Gross 19,405 15,435
Finite-Lived Intangible Assets, Accumulated Amortization 5,756 3,606
Backlog and non-compete agreement [Member]
    
Finite-Lived Intangible Assets, Gross 1,112 1,112
Finite-Lived Intangible Assets, Accumulated Amortization 472 31
Acquired technology [Member]
    
Finite-Lived Intangible Assets, Gross 2,138 2,138
Finite-Lived Intangible Assets, Accumulated Amortization $ 174 $ 0