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Contract Costs (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Disaggregation of Revenue |  |  |  |  |
Contract costs | $ 36,482,000 | $ 36,482,000 |  | $ 21,524,000 | $ 0
Capitalized contract, term | 36 months | 36 months |  |  |
Amortization of contract costs |  | $ 10,332,000 | $ 0 |  |
Impairment of contract costs | $ 0 | 0 |  |  |
Sales Commissions |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Contract costs | 3,900,000 | 3,900,000 |  | 2,300,000 |
Amortization of contract costs | 400,000 | 1,100,000 |  |  |
Freight and Mobilization |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Contract costs | 32,600,000 | 32,600,000 |  | $ 19,200,000 |
Amortization of contract costs | $ 3,600,000 | $ 9,200,000 |  |  |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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