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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Components of Property, Plant and Equipment    
Land $ 5,078 $ 1,442
Buildings and leasehold improvements 30,252 18,520
Machinery, equipment and rental tools 70,420 54,279
Equipment in progress 5,389 9,382
Furniture and fixtures 2,398 1,358
Property and equipment 125,127 96,860
Less accumulated depreciation (47,858) (40,361)
Property and equipment , net 77,269 56,499
Transportation equipment [Member]
   
Components of Property, Plant and Equipment    
Property and equipment 5,710 5,136
Computer equipment and software [Member]
   
Components of Property, Plant and Equipment    
Property and equipment $ 5,880 $ 6,743