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Details of Selected Balance Sheet Accounts - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Concentration Risk [Line Items]            
Increase (decrease) in contract with customer, asset       $ (400)    
Contract with customer, asset, reclassified to receivable       22,100    
Contract with customer, asset, increase due to revenue recognized       21,800    
Increase (decrease) in contract with customer, liability       5,800    
Contract with customer, liability, increase due to billings       16,600    
Contract with customer, liability, revenue recognized       (10,500)    
Impairments of inventories   $ 25,230   25,230 $ 0  
Depreciation $ 18,500   $ 25,100 38,600 49,900  
Impairments of fixed assets 2,992 $ 5,198 0 8,190 0  
Amortization 6,100   $ 6,800 12,500 $ 13,500  
Total Well Site Services | Drilling Services            
Concentration Risk [Line Items]            
Impairments of fixed assets $ 3,000     5,200    
Total Well Site Services | Completion Services            
Concentration Risk [Line Items]            
Impairments of inventories       9,000    
Impairments of fixed assets       $ 3,000    
UNITED STATES | Geographic Concentration Risk | Accounts Receivable            
Concentration Risk [Line Items]            
Concentration risk, percentage       61.00%   73.00%
UNITED KINGDOM | Geographic Concentration Risk | Accounts Receivable            
Concentration Risk [Line Items]            
Concentration risk, percentage       18.00%   10.00%
SINGAPORE | Geographic Concentration Risk | Accounts Receivable            
Concentration Risk [Line Items]            
Concentration risk, percentage       13.00%