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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 |

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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