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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Summary of Allowance for Doubtful Accounts and Revenue Adjustments [Table Text Block] |
|  | 2017 |  | 2016 |  | 2015
Balance at beginning of year |  | $ | 567 |  |  | $ | 499 |  |  | $ | 502 |
Provision for bad debt |  |  | 116 |  |  |  | 126 |  |  |  | 16 |
Write-offs, net of recoveries |  |  | (31 | ) |  |  | (58 | ) |  |  | (19 | )
Balance at end of year |  | $ | 652 |  |  | $ | 567 |  |  | $ | 499 |

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