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Business Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total Revenues $ 1,721,005 $ 1,595,227 $ 728,974
Operating Segments      
Segment Reporting Information [Line Items]      
Total Revenues 1,721,005 1,595,227 728,974
Operating Segments | Technical Services      
Segment Reporting Information [Line Items]      
Total Revenues 1,647,213 1,538,351 679,654
Operating Segments | Technical Services | Pressure Pumping      
Segment Reporting Information [Line Items]      
Total Revenues 945,919 993,538 336,550
Operating Segments | Technical Services | Downhole Tools      
Segment Reporting Information [Line Items]      
Total Revenues 423,811 294,606 169,754
Operating Segments | Technical Services | Coiled Tubing      
Segment Reporting Information [Line Items]      
Total Revenues 100,049 109,462 70,511
Operating Segments | Technical Services | Nitrogen      
Segment Reporting Information [Line Items]      
Total Revenues 49,198 38,961 37,172
Operating Segments | Technical Services | Snubbing      
Segment Reporting Information [Line Items]      
Total Revenues 17,818 23,838 18,903
Operating Segments | Technical Services | All Other Technical Services      
Segment Reporting Information [Line Items]      
Total Revenues 110,418 77,946 46,764
Operating Segments | Support Services      
Segment Reporting Information [Line Items]      
Total Revenues 73,792 56,876 49,320
Operating Segments | Support Services | Rental Tools      
Segment Reporting Information [Line Items]      
Total Revenues 50,809 30,264 21,443
Operating Segments | Support Services | All Other Support Services      
Segment Reporting Information [Line Items]      
Total Revenues $ 22,983 $ 26,612 $ 27,877