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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |  |
Changes in valuation and qualifying accounts |  |  |  |
Balance at Beginning of Period |  | $ 12,827 | $ 15,943 | $ 7,768
Additions: Charged to Costs and Expenses |  | 1,227 | 1,743 | 1,172
Additions: Charged to Other Accounts | [1] | 3,792 | (1,037) | 9,501
Deductions | [2] | 1,844 | 3,822 | 2,498
Balance at End of Period |  | 16,002 | 12,827 | 15,943
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
Changes in valuation and qualifying accounts |  |  |  |
Balance at Beginning of Period |  | 69,400 | 68,694 | 47,849
Additions: Charged to Costs and Expenses |  | 3,691 | 1,891 | 16,222
Additions: Charged to Other Accounts | [1] | (481) | 2,437 | 4,854
Deductions | [2] | 1,064 | 3,622 | 231
Balance at End of Period |  | $ 71,546 | $ 69,400 | $ 68,694
[1] | Currency translation adjustment, additions from acquisitions 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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