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RESTRUCTURING AND RELATED CHARGES - Schedule of Restructuring Liability Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | $ 699 | $ 1,119 |
Charges payable in cash | 38,403 | 31 |
Cash payments | (26,617) | (436) |
Foreign currency translation | 1,646 | (15) |
Restructuring reserve, ending balance | 14,131 | 699 | $ 1,119
Stock-based compensation | 39,010 | 81,615 | 64,821
Employee Severance and Benefit Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | 699 | 1,119 |
Charges payable in cash | 36,266 | 31 |
Cash payments | (25,328) | (436) |
Foreign currency translation | 1,660 | (15) |
Restructuring reserve, ending balance | 13,297 | 699 | 1,119
Stock-based compensation | 1,700 |  |
Other Exit Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | 0 | 0 |
Charges payable in cash | 2,137 | 0 |
Cash payments | (1,289) | 0 |
Foreign currency translation | (14) | 0 |
Restructuring reserve, ending balance | $ 834 | $ 0 | $ 0

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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