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BUSINESS SEGMENT INFORMATION - Revenues by major service lines (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment information: |  |  |  |
Revenues | $ 358,516 | $ 467,926 | $ 693,172 | $ 904,260
Technical Services |  |  |  |
Segment information: |  |  |  |
Revenues | 338,034 | 449,852 | 652,113 | 868,915
Technical Services | Pressure Pumping |  |  |  |
Segment information: |  |  |  |
Revenues | 170,066 | 269,040 | 317,825 | 525,195
Technical Services | Downhole Tools |  |  |  |
Segment information: |  |  |  |
Revenues | 112,763 | 107,521 | 222,434 | 200,562
Technical Services | Coiled Tubing |  |  |  |
Segment information: |  |  |  |
Revenues | 21,284 | 27,404 | 41,462 | 52,600
Technical Services | Nitrogen |  |  |  |
Segment information: |  |  |  |
Revenues | 12,219 | 11,784 | 23,527 | 23,215
Technical Services | Snubbing |  |  |  |
Segment information: |  |  |  |
Revenues | 4,355 | 6,055 | 7,818 | 10,027
Technical Services | All other |  |  |  |
Segment information: |  |  |  |
Revenues | 17,347 | 28,048 | 39,047 | 57,316
Support Services |  |  |  |
Segment information: |  |  |  |
Revenues | 20,482 | 18,074 | 41,059 | 35,345
Support Services | Rental Tools |  |  |  |
Segment information: |  |  |  |
Revenues | 13,962 | 12,550 | 27,898 | 22,570
Support Services | All other |  |  |  |
Segment information: |  |  |  |
Revenues | $ 6,520 | $ 5,524 | $ 13,161 | $ 12,775

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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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