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Details of Selected Balance Sheet Accounts - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
service
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
service
Jun. 30, 2019
service
Concentration Risk [Line Items]              
Increase (decrease) in contract with customer, asset         $ (800)    
Contract with customer, asset, reclassified to receivable         22,800    
Contract with customer, asset, increase due to revenue recognized         22,000    
Deferred revenue         31,114 $ 11,793  
Contract with customer, liability, increase due to billings         46,400    
Contract with customer, liability, revenue recognized         15,200    
Impairments of inventories $ 5,921   $ 25,230   31,151 0  
Depreciation 18,000     $ 24,600 56,600 74,500  
Impairments of fixed assets 0 $ 2,992 5,198 33,697 8,190 33,697  
Amortization $ 6,200     $ 6,800 18,700 $ 20,300  
Total Well Site Services | Drilling Services              
Concentration Risk [Line Items]              
Impairments of inventories     0        
Number of rigs | service       9   9 34
Impairments of fixed assets   3,000 5,198 $ 33,700      
Total Well Site Services | Completion Services              
Concentration Risk [Line Items]              
Impairments of inventories     8,981   $ 9,000    
Impairments of fixed assets   $ 3,000 $ 0        
UNITED STATES | Geographic Concentration Risk | Accounts Receivable              
Concentration Risk [Line Items]              
Concentration risk, percentage         62.00%    
UNITED KINGDOM | Geographic Concentration Risk | Accounts Receivable              
Concentration Risk [Line Items]              
Concentration risk, percentage         17.00%    
SINGAPORE | Geographic Concentration Risk | Accounts Receivable              
Concentration Risk [Line Items]              
Concentration risk, percentage         12.00%