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ACQUISITION Acquisition (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 12, 2018
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Business Acquisition [Line Items]            
Acquisition-related costs     $ 673 $ 457 $ 1,250 $ 457
Revenue from services     588,594 614,301 1,140,946 1,168,689
TMP            
Business Acquisition [Line Items]            
Cash purchase price, net of cash acquired $ 22,742          
Cash acquired from acquisition $ 7,000          
Acquisition-related costs       $ 500   $ 500
Revenue from services   $ 2,900 $ 12,600   $ 26,900