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Business Segments (Assets by Segment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Assets $ 1,829,652 $ 2,195,228 $ 1,835,192
Operating Segments | Drilling & Downhole      
Segment Reporting Information [Line Items]      
Assets 663,414 1,057,378 1,145,426
Operating Segments | Completions      
Segment Reporting Information [Line Items]      
Assets 872,731 790,255 317,016
Operating Segments | Production      
Segment Reporting Information [Line Items]      
Assets 243,354 251,685 175,940
Corporate      
Segment Reporting Information [Line Items]      
Assets $ 50,153 $ 95,910 $ 196,810