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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |  |
Changes in valuation and qualifying accounts |  |  |  |
Balance at Beginning of Period |  | $ 16,002 | $ 12,827 | $ 15,943
Additions: Charged to Costs and Expenses |  | 1,391 | 1,227 | 1,743
Additions: Charged to Other Accounts | [1] | (1,239) | 3,792 | (1,037)
Deductions | [2] | 1,375 | 1,844 | 3,822
Balance at End of Period |  | 14,779 | 16,002 | 12,827
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
Changes in valuation and qualifying accounts |  |  |  |
Balance at Beginning of Period |  | 71,546 | 69,400 | 68,694
Additions: Charged to Costs and Expenses |  | 9,606 | 3,691 | 1,891
Additions: Charged to Other Accounts | [1] | (6,741) | (481) | 2,437
Deductions | [2] | 8,998 | 1,064 | 3,622
Balance at End of Period |  | $ 65,413 | $ 71,546 | $ 69,400
[1] | Currency translation adjustment, reductions from restructuring and other adjustments.
[2] | For the Allowance for doubtful accounts, deductions relate to uncollectible accounts written-off, net of recoveries. For the Deferred tax asset valuation allowance, deductions relate to the reversal of valuation allowances due to the realization of net operating loss carryforwards.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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