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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
Valuation and Qualifying Accounts Disclosure |  |  |  |
Balance at beginning of year |  | $ 3,241 |  |
Balance at end of year |  | 2,516 | $ 3,241 |
Allowance for Doubtful Accounts and Returns |  |  |  |
Valuation and Qualifying Accounts Disclosure |  |  |  |
Balance at beginning of year |  | 2,428 | 2,570 | $ 2,929
Charged to costs and expenses |  | 375 | 1,183 | 649
Reclassification | [1] | 772 | (526) | 0
Charged to other accounts | [2] | (222) | 80 | (4)
Deductions | [3] | (837) | (879) | (1,004)
Balance at end of year |  | 2,516 | 2,428 | 2,570
Sales Returns and Allowances |  |  |  |
Valuation and Qualifying Accounts Disclosure |  |  |  |
Balance at beginning of year |  | 813 | 538 | 686
Charged to costs and expenses |  | 688 | 419 | (88)
Charged to other accounts | [2] | 10 | 31 | (15)
Deductions | [3] | (198) | (175) | (45)
Balance at end of year |  | 1,313 | 813 | 538
Inventory Reserves |  |  |  |
Valuation and Qualifying Accounts Disclosure |  |  |  |
Balance at beginning of year |  | 4,107 | 3,644 | 3,540
Charged to costs and expenses |  | 1,916 | 1,698 | 1,455
Charged to other accounts | [2] | (139) | 183 | (50)
Deductions | [4] | (246) | (1,418) | (1,301)
Balance at end of year |  | 5,638 | 4,107 | 3,644
Valuation Allowance for Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure |  |  |  |
Balance at beginning of year |  | 9,691 | 6,865 | 5,884
Charged to costs and expenses |  | 2,373 | 1,634 | 1,295
Charged to other accounts | [2] | (545) | 1,192 | (314)
Balance at end of year |  | $ 11,519 | $ 9,691 | $ 6,865
[1] | Includes amount reclassified between Allowance for Doubtful Accounts and Other Receivables related to a customer's open receivables balance which was resolved in 2018, as well as acquisition-related adjustments.
[2] | Primarily includes impact from foreign currency fluctuations
[3] | Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.
[4] | Includes inventory identified as excess, slow moving or obsolete and charged against reserves.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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