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ACQUISITIONS (Fair Value of Net Assets Acquired) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Unbilled revenues $ 129,683   $ 86,422 $ 86,500
Goodwill 144,987     $ 119,531
Continuum        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Cash and cash equivalents 2,251 $ 2,251    
Accounts receivable 6,676 6,676    
Unbilled revenues 2,463 2,463    
Prepaid and other current assets 942 942    
Goodwill 26,693 29,805    
Intangible assets 14,450 16,600    
Property and equipment and other noncurrent assets 8,902 8,902    
Total assets acquired 62,377 67,639    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Accounts payable, accrued expenses and other current liabilities 2,751 2,991    
Due to employees 1,001 1,001    
Long-term debt (Note 6) 3,220 3,220    
Other noncurrent liabilities 490 5,412    
Total liabilities assumed 7,462 12,624    
Net assets acquired $ 54,915 $ 55,015