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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
segment
Sep. 30, 2014
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     1  
Segment Reporting Information [Line Items]        
Revenue $ 21,193 $ 25,599 $ 70,164 $ 69,873
Operating costs and expenses 17,395 19,759 59,660 54,586
Other income, net 13 127 54 174
Income before provision for income taxes 3,811 5,967 10,558 15,461
Operating Segments | Rental        
Segment Reporting Information [Line Items]        
Revenue 18,491 20,177 58,806 58,431
Operating costs and expenses 7,327 8,110 22,062 23,815
Other income, net 0 0 0 0
Income before provision for income taxes 11,164 12,067 36,744 34,616
Operating Segments | Sales        
Segment Reporting Information [Line Items]        
Revenue 2,468 5,218 10,672 10,831
Operating costs and expenses 1,740 3,493 7,706 6,826
Other income, net 0 0 0 0
Income before provision for income taxes 728 1,725 2,966 4,005
Operating Segments | Service & Maintenance        
Segment Reporting Information [Line Items]        
Revenue 234 204 686 611
Operating costs and expenses 70 101 151 269
Other income, net 0 0 0 0
Income before provision for income taxes 164 103 535 342
Operating Segments | Retirement of Rental Equipment        
Segment Reporting Information [Line Items]        
Revenue 0   0  
Operating costs and expenses (3)   4,370  
Other income, net 0   0  
Income before provision for income taxes 3   (4,370)  
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 8,261 8,055 25,371 23,676
Other income, net 13 127 54 174
Income before provision for income taxes $ (8,248) $ (7,928) $ (25,317) $ (23,502)