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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

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
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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

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-Publisher FASB
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-Topic 340
-SubTopic 40
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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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