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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | $ 2,476 | $ 3,366 |  | $ 1,996 |  | $ 2,689 |
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 174 | 1,892 |  | 256 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction |  | 4,692 | 3,577 |  | 2,969 |  |  |
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 1,309 | 2,542 |  | 1,309 |  | 1,310 |
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 139 | 1,814 |  | 258 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [1] | 1,372 | 581 |  | 259 |  |  |
Allowance for revenue adjustments [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 772 | 464 | [2] | 405 | [2] | 1,095 | [2]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account |  | 3,628 | 3,055 |  | 2,020 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [3] | 3,320 | 2,996 |  | 2,710 |  |  |
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 395 | 360 |  | 282 |  | $ 284 |
Valuation Allowances and Reserves, Charged to Cost and Expense |  | $ 35 | $ 78 |  | $ (2) |  |  |
[1] | Represents uncollectible accounts written off, net of recoveries
[2] | Represents an allowance for adjustments to accounts receivable due to disputed rates, accessorial charges and other aspects of previously billed shipments.
[3] | Represents adjustments to billed accounts receivable

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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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