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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | VALUATION AND QUALIFYING ACCOUNTS For the year ended December 31, 2020, 2019 and 2018
(in thousands) | Balance at Beginning of Year |  |  |  | Charges to Revenue |  | Charges (Benefits) to Expense |  | Charges to Other Accounts - Equity |  | Deductions/Write-offs |  | Balance at End of Year
Allowance for doubtful accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2020 | $ | 830 |  |  |  |  | $ | — |  |  | $ | (24) |  |  | $ | — |  |  | $ | (314) |  |  | $ | 492 |
Year ended December 31, 2019 | 500 |  |  |  |  | — |  |  | 616 |  |  | — |  |  | (286) |  |  | 830 |
Year ended December 31, 2018 | 750 |  |  |  |  | — |  |  | 199 |  |  | — |  |  | (449) |  |  | 500 |
Valuation allowance for deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2020 | $ | 277,693 |  |  |  |  | $ | — |  |  | $ | 16,762 |  |  | $ | (7,179) |  |  | $ | — |  |  | $ | 287,276 |
Year ended December 31, 2019 | 271,374 |  |  |  |  | — |  |  | 4,717 |  |  | 1,602 |  |  | — |  |  | 277,693 |
Year ended December 31, 2018 | 226,458 |  |  |  |  | — |  |  | 42,772 |  |  | 2,144 |  |  | — |  |  | 271,374 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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