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Schedule II - Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
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, 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 |  |  | 4,947 |  |  | — |  |  | 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 |  |  | 2,276 |  |  | — |  |  | 2,969 |  |  | 1,996 |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,155 |  |  | $ | 33 |  |  | $ | — |  |  | $ | 878 |  | (2) | $ | 1,310 |
Allowance for revenue adjustments (1) |  | 408 |  |  | 4,793 |  |  | — |  |  | 4,106 |  | (3) | 1,095 |
Income tax valuation |  | 273 |  |  | 11 |  |  | — |  |  | — |  |  | 284 |
|  | 2,836 |  |  | 4,837 |  |  | — |  |  | 4,984 |  |  | 2,689 |
(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 any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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