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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 1,201 | $ 718 | $ 695
Additions, Charged to Costs and Expenses | 0 | 483 | 23
Additions, Charged to Other Accounts | 0 | 0 | 0
(Deductions) | (101) | 0 | 0
Balance at End of Year | 1,100 | 1,201 | 718
Deferred income tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 70,731 | 72,316 | 68,469
Additions, Charged to Costs and Expenses | 0 | 0 | 0
Additions, Charged to Other Accounts | 0 | 0 | 3,847
(Deductions) | (1,955) | (1,585) | 0
Balance at End of Year | $ 68,776 | $ 70,731 | $ 72,316

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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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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