Impairment of Inventory and Long-Lived Assets for Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of pre-tax impairment charges

The Company recorded impairment charges during the three months ended March 31, 2016 and June 30, 2015, as follows (in thousands):

	Three months ended
	March 31, 2016		June 30, 2015
Drilling Technologies:
Inventories	$	12,653	$	17,241
Long-lived assets:
Property and equipment	14,642		2,327
Intangible assets other than goodwill	9,227		—
Production Technologies:
Inventories	3,913		804
Total impairment	$	40,435	$	20,372