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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Impairment of Inventory and Rental Equipment (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Inventories		$ 18,600,000	$ 2,000,000
Rental equipment		2,300,000	0	$ 0
Impairment of inventory and rental equipment	$ 20,372,000	$ 20,372,000	$ 0	$ 0
Drilling Technologies [Member]
Segment Reporting Information [Line Items]
Inventories	17,241,000
Rental equipment	2,327,000
Production Technologies [Member]
Segment Reporting Information [Line Items]
Inventories	$ 804,000