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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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Impairment of Inventory and Rental Equipment (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Rental equipment		$ 2,300
Total	$ 0	20,372	$ 0	$ 20,372	$ 0
Drilling Technologies [Member]
Segment Reporting Information [Line Items]
Inventories		17,241
Rental equipment		2,327
Production Technologies [Member]
Segment Reporting Information [Line Items]
Inventories		$ 804