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v3.20.1

Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Summary of Allowance for Doubtful Accounts and Revenue Adjustments [Table Text Block] |
|  | 2019 |  | 2018 |  | 2017
Balance at beginning of year |  | $ | 564 |  |  | $ | 652 |  |  | $ | 567 |
Provision for bad debt |  |  | (52 | ) |  |  | (50 | ) |  |  | 116 |
Write-offs, net of recoveries |  |  | (26 | ) |  |  | (38 | ) |  |  | (31 | )
Balance at end of year |  | $ | 486 |  |  | $ | 564 |  |  | $ | 652 |

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