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Reportable Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue and other financial information by reportable segment
Revenue from external customers	$ 197,853	$ 195,849	$ 585,720	$ 613,289
Total gross margin	87,416	103,323	275,602	329,003
Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	153,524	156,599	454,622	495,811
Total gross margin	81,573	96,823	256,331	308,990
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	44,329	39,250	131,098	117,478
Total gross margin	$ 5,843	$ 6,500	$ 19,271	$ 20,013

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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