Quarterly report pursuant to Section 13 or 15(d)

Revenue - Narrative (Details)

v3.19.1
Revenue - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
business_line
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Revenue from Contract with Customer [Abstract]      
Number of business lines | business_line 2    
Disaggregation of Revenue [Line Items]      
Revenues $ 157,397 $ 109,675  
Typical payment term (days) 30 days    
Capitalized mobilization costs $ 400   $ 5,300
Capitalized contract cost, amortization 3,100 1,000  
Lease revenue      
Disaggregation of Revenue [Line Items]      
Revenues 42,041    
Service revenue      
Disaggregation of Revenue [Line Items]      
Revenues 115,356    
Reimbursable revenue      
Disaggregation of Revenue [Line Items]      
Revenues $ 28,500 $ 14,300  
Minimum      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 2    
Maximum      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, expected timing of satisfaction, period 60