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Segment Information - Disaggregation of Revenue by Revenue Source and Geography (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total Revenues	$ 128,986	$ 108,083	$ 376,640	$ 336,473
United States
Disaggregation of Revenue [Line Items]
Total Revenues	70,223	53,706	202,542	180,853
International
Disaggregation of Revenue [Line Items]
Total Revenues	58,763	54,377	174,098	155,620
Europe/Middle East/Africa
Disaggregation of Revenue [Line Items]
Total Revenues	31,972	37,381	96,665	102,586
Latin America
Disaggregation of Revenue [Line Items]
Total Revenues	11,984	6,897	32,441	25,957
Asia Pacific
Disaggregation of Revenue [Line Items]
Total Revenues	7,026	5,302	20,689	14,791
Other countries
Disaggregation of Revenue [Line Items]
Total Revenues	7,781	4,797	24,303	12,286
International Services
Disaggregation of Revenue [Line Items]
Total Revenues	53,891	53,742	161,985	153,851
International Services | United States
Disaggregation of Revenue [Line Items]
Total Revenues	0	0	0	0
International Services | International
Disaggregation of Revenue [Line Items]
Total Revenues	53,891	53,742	161,985	153,851
U.S. Services
Disaggregation of Revenue [Line Items]
Total Revenues	38,292	29,065	106,035	89,936
U.S. Services | United States
Disaggregation of Revenue [Line Items]
Total Revenues	38,292	29,065	106,035	89,936
U.S. Services | International
Disaggregation of Revenue [Line Items]
Total Revenues	0	0	0	0
Tubular Sales
Disaggregation of Revenue [Line Items]
Total Revenues	12,871	7,701	42,152	40,787
Tubular Sales | United States
Disaggregation of Revenue [Line Items]
Total Revenues	12,835	7,209	41,939	39,543
Tubular Sales | International
Disaggregation of Revenue [Line Items]
Total Revenues	36	492	213	1,244
Blackhawk
Disaggregation of Revenue [Line Items]
Total Revenues	23,932	17,575	66,468	51,899
Blackhawk | United States
Disaggregation of Revenue [Line Items]
Total Revenues	19,096	17,432	54,568	51,374
Blackhawk | International
Disaggregation of Revenue [Line Items]
Total Revenues	$ 4,836	$ 143	$ 11,900	$ 525

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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