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ACQUISITION (Fair Value of the Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Apr. 30, 2019
Business Acquisition [Line Items]        
Goodwill   $ 207,764 $ 195,043  
test IO        
Business Acquisition [Line Items]        
Cash and cash equivalents       $ 663
Trade receivables and contract assets       621
Prepaid and other current assets       150
Goodwill       11,926
Intangible assets       6,219
Property and equipment and other noncurrent assets       305
Total assets acquired       19,884
Accounts payable, accrued expenses and other current liabilities       993
Other noncurrent liabilities       1,568
Total liabilities assumed       2,561
Net assets acquired       $ 17,323
Decrease to goodwill $ 226 $ 226