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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts and sales returns and allowances |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 8,882 | $ 6,319 | $ 5,572
Charged to Costs and Expenses | 557 | 4,920 | 2,009
Other | (4,649) | 1,518 | 0
Deductions | (1,071) | (3,875) | (1,262)
Balance at End of Period | 3,719 | 8,882 | 6,319
Deferred tax assets valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 7,961 | 3,604 | 4,887
Charged to Costs and Expenses | (894) | 740 | (1,228)
Other | 0 | 3,617 | 0
Deductions | (94) | 0 | (55)
Balance at End of Period | $ 6,973 | $ 7,961 | $ 3,604

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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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