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Business Segments - Assets by Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Assets $ 924,021 $ 1,159,997
Operating Segments | Drilling & Downhole    
Segment Reporting Information [Line Items]    
Assets 345,980 407,779
Operating Segments | Completions    
Segment Reporting Information [Line Items]    
Assets 406,325 496,714
Operating Segments | Production    
Segment Reporting Information [Line Items]    
Assets 142,841 186,786
Corporate    
Segment Reporting Information [Line Items]    
Assets $ 28,875 $ 68,718