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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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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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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Impairment of Inventory and Long-Lived Assets for Discontinued Operations (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property and equipment		$ 0	$ 0	$ 0
Impairment of inventory and rental equipment	$ 40,435,000
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
Production Technologies:
Segment Reporting Information [Line Items]
Inventories	$ 3,913,000