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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 393,936 |  |
Other comprehensive income (loss) before reclassification adjustments | (35,972) | $ 4,479 | $ 2,491
Reclassification adjustments included in net income (loss) | 0 | 0 | 106
Other comprehensive income (loss) | (35,972) | 4,479 | 2,597
Reclassification for impact of U.S. tax rate change |  |  | 161
Ending balance | 107,675 | 393,936 |
Foreign currency translation adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 39,152 | 34,294 | 30,962
Other comprehensive income (loss) before reclassification adjustments | (35,972) | 4,858 | 3,332
Reclassification adjustments included in net income (loss) | 0 | 0 | 0
Other comprehensive income (loss) | (35,972) | 4,858 | 3,332
Reclassification for impact of U.S. tax rate change |  |  | 0
Ending balance | 3,180 | 39,152 | 34,294
Unrealized gain (loss) on available-for-sale securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (71) | 308 | 882
Other comprehensive income (loss) before reclassification adjustments | 0 | (379) | (841)
Reclassification adjustments included in net income (loss) |  | 0 | 106
Other comprehensive income (loss) | 0 | (379) | (735)
Reclassification for impact of U.S. tax rate change |  |  | 161
Ending balance | (71) | (71) | 308
Accumulated other comprehensive income (loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 39,081 | 34,602 | 31,844
Ending balance | $ 3,109 | $ 39,081 | $ 34,602

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- Definition Reclassification from AOCI, Current Period, Stranded Tax Effects ASU 2018-02, Tax + 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 before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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