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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 |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 695 | $ 523 | $ 649
Additions, Charged to Costs and Expenses | 23 | 172 | 0
Additions, Charged to Other Accounts | 0 | 0 | 0
(Deductions) | 0 | 0 | (126)
Balance at End of Year | 718 | 695 | 523
Deferred income tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 68,469 | 17,922 | 14,548
Additions, Charged to Costs and Expenses | 0 | 0 | 0
Additions, Charged to Other Accounts | 3,847 | 50,547 | 3,374
(Deductions) | 0 | 0 | 0
Balance at End of Year | $ 72,316 | $ 68,469 | $ 17,922

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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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