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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts receivable and revenue adjustments |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | $ 7,657 | $ 5,437 | $ 4,825
Additions, Charged to Costs and Expenses | 2,336 | 4,081 | 1,643
Additions, Charged to Other Accounts | 863 | 2,416 | 980
Deductions | 3,476 | 4,277 | 2,011
Balance at End of Period | 7,380 | 7,657 | 5,437
Allowance for other accounts receivable |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 921 | 849 | 1,029
Additions, Charged to Costs and Expenses | (115) | 72 | (180)
Balance at End of Period | 806 | 921 | 849
Allowance for deferred tax assets |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 844 | 293 | 354
Deductions | 791 | (551) | 61
Balance at End of Period | $ 53 | $ 844 | $ 293

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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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