Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Impairment of Inventory and Long-Lived Assets for Discontinued Operations - Schedule of asset impairment charges (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 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