Business Segment and Entity wide Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment information:
Total revenues	$ 598,302	$ 1,222,409	$ 1,721,005
Technical Services
Segment information:
Total revenues	556,488	1,145,554	1,647,213
Technical Services | Pressure Pumping
Segment information:
Total revenues	221,597	519,543	945,919
Technical Services | Downhole Tools
Segment information:
Total revenues	195,052	414,352	423,811
Technical Services | Coiled Tubing
Segment information:
Total revenues	51,616	80,758	100,049
Technical Services | Nitrogen
Segment information:
Total revenues	30,213	45,658	49,198
Technical Services | Snubbing
Segment information:
Total revenues	8,016	14,520	17,818
Technical Services | All other
Segment information:
Total revenues	49,994	70,723	110,418
Support Services
Segment information:
Total revenues	41,814	76,855	73,792
Support Services | Rental Tools
Segment information:
Total revenues	25,280	51,792	50,809
Support Services | All other
Segment information:
Total revenues	$ 16,534	$ 25,063	$ 22,983