Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Operating Revenue (Details)

v3.19.3
REVENUES - Operating Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 58,909 $ 54,610 $ 165,682 $ 169,660
Dry-leasing | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenues 610 1,142 2,055 2,984
Dry-leasing | International        
Disaggregation of Revenue [Line Items]        
Total revenues 3,640 1,574 10,058 5,560
Operating Income        
Disaggregation of Revenue [Line Items]        
Total revenues 54,659 51,894 153,569 161,116
Operating Income | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenues 38,027 38,229 107,016 117,673
Operating Income | International        
Disaggregation of Revenue [Line Items]        
Total revenues 16,632 13,665 46,553 43,443
Operating Income | Oil and Gas        
Disaggregation of Revenue [Line Items]        
Total revenues 50,966 49,138 144,705 153,221
Operating Income | Oil and Gas | U.S.        
Disaggregation of Revenue [Line Items]        
Total revenues 36,226 35,473 101,850 109,778
Operating Income | Oil and Gas | International        
Disaggregation of Revenue [Line Items]        
Total revenues 14,740 13,665 42,855 43,443
Operating Income | Emergency response services        
Disaggregation of Revenue [Line Items]        
Total revenues $ 3,693 $ 2,756 $ 8,864 $ 7,895