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Contract Costs (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue
Contract costs	$ 31,240,000	$ 31,240,000		$ 21,524,000	$ 0
Capitalized contract, term		36 months
Amortization of contract costs		$ 6,281,000	$ 0
Impairment of contract costs	0	0
Sales Commissions
Disaggregation of Revenue
Contract costs	3,200,000	3,200,000		2,300,000
Amortization of contract costs	400,000	700,000
Freight and Mobilization
Disaggregation of Revenue
Contract costs	28,000,000	28,000,000		$ 19,200,000
Amortization of contract costs	$ 3,000,000	$ 5,600,000

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+ References

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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

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-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

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