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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 3,719 | $ 8,882 | $ 6,319
Charged to Costs and Expenses | 2,126 | 557 | 4,920
Other | 0 | (4,649) | 1,518
Deductions | (1,542) | (1,071) | (3,875)
Balance at End of Period | 4,303 | 3,719 | 8,882
Deferred tax assets valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 6,973 | 7,961 | 3,604
Charged to Costs and Expenses | 3,848 | (894) | 740
Other | 1,291 | 0 | 3,617
Deductions | (43) | (94) | 0
Balance at End of Period | $ 12,069 | $ 6,973 | $ 7,961

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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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