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Segment Information - Disaggregation of Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 145,853	$ 128,986	$ 132,085	$ 115,569	$ 118,322	$ 108,083	$ 117,659	$ 110,731	$ 522,493	$ 454,795	$ 487,531
International Services
Disaggregation of Revenue [Line Items]
Revenue									222,992	206,746	237,207
U.S. Services
Disaggregation of Revenue [Line Items]
Revenue									148,941	118,815	152,827
Tubular Sales
Disaggregation of Revenue [Line Items]
Revenue									61,415	58,210	87,515
Blackhawk
Disaggregation of Revenue [Line Items]
Revenue									89,145	71,024	9,982
United States
Disaggregation of Revenue [Line Items]
Revenue									280,595	244,684	247,864
United States | International Services
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
United States | U.S. Services
Disaggregation of Revenue [Line Items]
Revenue									148,941	118,815	152,827
United States | Tubular Sales
Disaggregation of Revenue [Line Items]
Revenue									59,338	55,862	85,055
United States | Blackhawk
Disaggregation of Revenue [Line Items]
Revenue									72,316	70,007	9,982
International
Disaggregation of Revenue [Line Items]
Revenue									241,898	210,111	239,667
International | International Services
Disaggregation of Revenue [Line Items]
Revenue									222,992	206,746	237,207
International | U.S. Services
Disaggregation of Revenue [Line Items]
Revenue									0	0	0
International | Tubular Sales
Disaggregation of Revenue [Line Items]
Revenue									2,077	2,348	2,460
International | Blackhawk
Disaggregation of Revenue [Line Items]
Revenue									16,829	1,017	0
Europe/Middle East/Africa
Disaggregation of Revenue [Line Items]
Revenue									135,786	138,304	160,651
Latin America
Disaggregation of Revenue [Line Items]
Revenue									46,553	33,131	35,390
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue									27,509	20,573	30,325
Other countries
Disaggregation of Revenue [Line Items]
Revenue									$ 32,050	$ 18,103	$ 13,301

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 606
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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