| SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] |
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Col. A |
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Col. B |
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Col. C |
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Col. D |
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Col. E |
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Balance at
Beginning
of Period
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Charged to
Costs and
Expenses
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Charged to
Other Accounts
Described
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Deductions
-Described
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Balance at
End of
Period
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Year ended December 31, 2018 |
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Allowance for doubtful accounts |
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$ |
2,542 |
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$ |
139 |
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$ |
— |
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$ |
1,372 |
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(2) |
$ |
1,309 |
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Allowance for revenue adjustments (1)
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464 |
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— |
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3,628 |
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3,320 |
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(3) |
772 |
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Income tax valuation |
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360 |
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35 |
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— |
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— |
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395 |
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3,366 |
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174 |
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3,628 |
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4,692 |
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2,476 |
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Year ended December 31, 2017 |
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Allowance for doubtful accounts |
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$ |
1,309 |
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$ |
1,814 |
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$ |
— |
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$ |
581 |
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(2) |
$ |
2,542 |
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Allowance for revenue adjustments (1)
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405 |
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— |
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3,055 |
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2,996 |
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(3) |
464 |
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Income tax valuation |
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282 |
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78 |
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— |
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— |
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360 |
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1,996 |
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1,892 |
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3,055 |
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3,577 |
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3,366 |
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Year ended December 31, 2016 |
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Allowance for doubtful accounts |
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$ |
1,310 |
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$ |
258 |
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$ |
— |
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$ |
259 |
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(2) |
$ |
1,309 |
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Allowance for revenue adjustments (1)
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1,095 |
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— |
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2,020 |
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2,710 |
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(3) |
405 |
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Income tax valuation |
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284 |
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(2 |
) |
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— |
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— |
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282 |
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2,689 |
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256 |
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2,020 |
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2,969 |
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1,996 |
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(1) Represents an allowance for adjustments to accounts receivable due to disputed rates, accessorial charges and other aspects of previously billed shipments.
(2) Represents uncollectible accounts written off, net of recoveries
(3) Represents adjustments to billed accounts receivable
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