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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for doubtful accounts |  |  |  |
Changes in valuation and qualifying accounts |  |  |  |
Balance at Beginning of Period |  | $ 7,768 | $ 7,299 | $ 7,858
Additions: Charged to Costs and Expenses |  | 1,172 | 1,657 | 1,969
Additions: Charged to Other Accounts | [1] | 9,501 | 72 | (1,046)
Deductions | [2] | 2,498 | 1,260 | 1,482
Balance at End of Period |  | 15,943 | 7,768 | 7,299
Valuation Allowance of Deferred Tax Assets [Member] |  |  |  |
Changes in valuation and qualifying accounts |  |  |  |
Balance at Beginning of Period |  | 47,849 | 51,294 | 48,840
Additions: Charged to Costs and Expenses |  | 16,222 | 3,704 | 7,533
Additions: Charged to Other Accounts | [1] | 4,854 | 3,923 | (521)
Deductions | [2] | (231) | (11,072) | (4,558)
Balance at End of Period |  | $ 68,694 | $ 47,849 | $ 51,294
[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 Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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