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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Components of Property, Plant and Equipment    
Land $ 4,348 $ 1,442
Buildings and leasehold improvements 29,029 18,520
Machinery, equipment and rental tools 69,436 54,279
Equipment in progress 7,051 9,382
Furniture and fixtures 2,327 1,358
Property and equipment 124,316 96,860
Less accumulated depreciation (45,149) (40,361)
Property and equipment , net 79,167 56,499
Transportation equipment [Member]
   
Components of Property, Plant and Equipment    
Property and equipment 5,570 5,136
Computer equipment and software [Member]
   
Components of Property, Plant and Equipment    
Property and equipment $ 6,555 $ 6,743