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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts receivable and revenue adjustments |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | $ 7,380 | $ 7,657 | $ 5,437
Additions, Charged to Costs and Expenses | 1,223 | 2,336 | 4,081
Additions, Charged to Other Accounts | (245) | 863 | 2,416
Deductions | 2,910 | 3,476 | 4,277
Balance at End of Period | 5,448 | 7,380 | 7,657
Allowance for other accounts receivable |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 806 | 921 | 849
Additions, Charged to Costs and Expenses | (330) | (115) | 72
Balance at End of Period | 476 | 806 | 921
Allowance for deferred tax assets |  |  |
Changes in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 53 | 844 | 293
Deductions | (615) | 791 | (551)
Balance at End of Period | $ 668 | $ 53 | $ 844

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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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