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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Net increase (decrease) from foreign currency translation gains (losses) | $ 10,200 | $ (1,500) | $ (2,300)
Tax Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 206,394 | 216,468 | 238,703
Net Increase (Decrease) to Expense | 5,749 | (10,074) | (7,727)
Acquisitions and Other | 0 | 0 | (14,508)
Balance at End of Year | $ 212,143 | 206,394 | 216,468
Revision of Prior Period, Adjustment | Tax Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year |  | $ 228,000 |
Net Increase (Decrease) to Expense |  |  | 3,800
Acquisitions and Other |  |  | 14,500
Balance at End of Year |  |  | $ 228,000

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- Definition Amount of increase (decrease) in cumulative translation adjustment, after tax, from translating foreign currency financial statements into the reporting currency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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