Impairment of Inventory and Long-Lived Assets - Schedule of asset impairment charges (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Inventories		$ 16,600,000		$ 18,000,000
Property and equipment	$ 0	14,600,000		2,300,000
Total Impairment	$ 0	40,435,000	$ 0	20,372,000	$ 40,435,000	$ 20,372,000
Drilling Technologies
Segment Reporting Information [Line Items]
Inventories		12,653,000		17,241,000
Property and equipment		14,642,000		2,327,000
Intangible assets other than goodwill		9,227,000		0
Production Technologies
Segment Reporting Information [Line Items]
Inventories		$ 3,913,000		$ 804,000