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Schedule of Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2019
Valuation And Qualifying Accounts [Abstract] |
Schedule Of Valuation And Qualifying Accounts Disclosure [Text Block] |
| Schedule II - Valuation Accounts
|  |  |  |  |  |  | Additions |  |  |  |
|  |  |  |  | Balance at |  |  |  |  |  |  |  | Balance at
|  |  |  |  | Beginning |  | Charges to |  |  |  |  |  | End of
(in thousands) |  | of Period |  | Operations |  | Other |  | Deductions |  | Period
| Year ended December 31, 2019: |  |  |  |  |  |  |  |  |  |
|  | Allowance for doubtful accounts(1) |  | $ 1,733 |  | 10,323 |  | — |  | 1,971 |  | 10,085
| Year ended December 31, 2018: |  |  |  |  |  |  |  |  |  |
|  | Allowance for doubtful accounts(1) |  | $ 105 |  | 1,718 |  | — |  | 90 |  | 1,733
| Year ended December 31, 2017: |  |  |  |  |  |  |  |  |  |
|  | Allowance for doubtful accounts(1) |  | $ 2,838 |  | 1,697 |  | — |  | 4,430 |  | 105
(1) | Deductions in the allowance for doubtful accounts represent write-offs, net of recoveries, of amounts
|  | determined to be uncollectible.
See accompanying Report of Independent Registered Public Accounting Firm incorporated herein by reference.

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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=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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