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Impairment of Inventory and Long-Lived Assets for Discontinued Operations - Schedule of asset impairment charges (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]          
Property and equipment $ 0 $ 0   $ 0 $ 0
Discontinued Operations, Held-for-sale          
Segment Reporting Information [Line Items]          
Total impairment     $ 40,435,000    
Discontinued Operations, Held-for-sale | Drilling Technologies          
Segment Reporting Information [Line Items]          
Inventories     12,653,000    
Property and equipment     14,642,000    
Intangible assets other than goodwill     9,227,000    
Discontinued Operations, Held-for-sale | Production Technologies          
Segment Reporting Information [Line Items]          
Inventories     $ 3,913,000