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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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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Rental equipment	$ 2,300
Total	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