Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 695,961   $ 587,298
Deposits on equipment and equipment in process of assembly 33,349   20,348
Property, plant and equipment, gross 729,310   607,646
Less: accumulated depreciation 305,995   256,629
Property, plant and equipment, net 423,315   351,017
Accumulated depreciation for assets under capital leases 900   800
Proceeds from disposal of property and equipment 898 $ 781  
Gain (loss) on disposal of property and equipment 128 (127)  
Pressure pumping equipment      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 199,333   190,211
Pressure pumping equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 3 years    
Pressure pumping equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 5 years    
Drilling rigs and related equipment      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 137,075   132,260
Proceeds from disposal of property and equipment 600 300  
Gain (loss) on disposal of property and equipment $ 500 $ 200  
Drilling rigs and related equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 3 years    
Drilling rigs and related equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 15 years    
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 140,308   97,569
Assets under capital lease $ 1,800   1,800
Machinery and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 7 years    
Machinery and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 20 years    
Buildings      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 47,593   45,992
Buildings | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 15 years    
Buildings | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 39 years    
Vehicles, trucks and trailers      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 91,680   54,055
Assets under capital lease $ 3,800   1,000
Vehicles, trucks and trailers | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 5 years    
Vehicles, trucks and trailers | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 10 years    
Coil tubing equipment      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 28,068   28,053
Coil tubing equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 4 years    
Coil tubing equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 10 years    
Land      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 14,183   11,317
Land improvements      
Property, Plant and Equipment [Line Items]      
Useful Life 15 years    
Property, plant, and equipment $ 9,614   9,614
Rail improvements      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 13,101   5,540
Rail improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 10 years    
Rail improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 20 years    
Other property and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment $ 15,006   $ 12,687
Other property and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful Life 3 years    
Other property and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful Life 12 years