Segment Information Products and Services (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Consolidated revenues by product line	100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Production [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	26.00%	29.00%	29.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Completion [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	22.00%	20.00%	20.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Drilling and Evaluation [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	24.00%	22.00%	22.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Well Construction [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	28.00%	29.00%	29.00%