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INCOME TAX - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 7 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2017 | May 31, 2016 | May 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance at the beginning of the year | $ 7,803 | $ 17,916 | $ 2,559 | $ 67,576
Additions based on income tax positions related to the current year | 4,626 | 7,537 | 287 | 6,311
Additions related to acquisition | 6,149 | 13,061 | 6,151 | 0
Additions for income tax positions of prior years | 247 | 411 | 753 | 512
Effect of foreign currency fluctuations on income tax positions | (3) | 27 | 2 | (5,713)
Reductions for income tax positions of prior years | (906) | (7,285) | (123) | (32)
Settlements with income tax authorities | 0 | (449) | (1,826) | (504)
Changes in judgment regarding tax position | 0 | 0 | 0 | (65,591)
Balance at the end of the year | $ 17,916 | $ 31,218 | $ 7,803 | $ 2,559

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- Definition Unrecognized Tax Benefits, Increase (Decreases) Resulting from Foreign Currency Translation + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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