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Schedule II - Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] |
Col. A |  | Col. B |  | Col. C |  | Col. D |  | Col. E
|  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts Described |  | Deductions -Described |  | Balance at End of Period
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,542 |  |  | $ | 139 |  |  | $ | — |  |  | $ | 1,372 |  | (2) | $ | 1,309 |
Allowance for revenue adjustments (1) |  | 464 |  |  | — |  |  | 3,628 |  |  | 3,320 |  | (3) | 772 |
Income tax valuation |  | 360 |  |  | 35 |  |  | — |  |  | — |  |  | 395 |
|  | 3,366 |  |  | 174 |  |  | 3,628 |  |  | 4,692 |  |  | 2,476 |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,309 |  |  | $ | 1,814 |  |  | $ | — |  |  | $ | 581 |  | (2) | $ | 2,542 |
Allowance for revenue adjustments (1) |  | 405 |  |  | — |  |  | 3,055 |  |  | 2,996 |  | (3) | 464 |
Income tax valuation |  | 282 |  |  | 78 |  |  | — |  |  | — |  |  | 360 |
|  | 1,996 |  |  | 1,892 |  |  | 3,055 |  |  | 3,577 |  |  | 3,366 |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,310 |  |  | $ | 258 |  |  | $ | — |  |  | $ | 259 |  | (2) | $ | 1,309 |
Allowance for revenue adjustments (1) |  | 1,095 |  |  | — |  |  | 2,020 |  |  | 2,710 |  | (3) | 405 |
Income tax valuation |  | 284 |  |  | (2 | ) |  | — |  |  | — |  |  | 282 |
|  | 2,689 |  |  | 256 |  |  | 2,020 |  |  | 2,969 |  |  | 1,996 |
(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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- 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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Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration