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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
Jun. 30, 2014
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     1  
Segment Reporting Information [Line Items]        
Revenue $ 24,230 $ 21,952 $ 48,971 $ 44,274
Operating costs and expenses 23,311 16,867 42,265 34,827
Other income, net 2 44 41 47
Income before provision for income taxes 921 5,129 6,747 9,494
Rental        
Segment Reporting Information [Line Items]        
Revenue 19,712 19,465 40,315 38,254
Operating costs and expenses 7,008 7,749 14,735 15,705
Other income, net 0 0 0 0
Income before provision for income taxes 12,704 11,716 25,580 22,549
Sales        
Segment Reporting Information [Line Items]        
Revenue 4,292 2,275 8,204 5,613
Operating costs and expenses 3,153 1,098 5,966 3,333
Other income, net 0 0 0 0
Income before provision for income taxes 1,139 1,177 2,238 2,280
Service & Maintenance        
Segment Reporting Information [Line Items]        
Revenue 226 212 452 407
Operating costs and expenses 43 84 81 168
Other income, net 0 0 0 0
Income before provision for income taxes 183 128 371 239
Retirement of Rental Equipment        
Segment Reporting Information [Line Items]        
Revenue 0   0  
Operating costs and expenses 4,373   4,373  
Other income, net 0   0  
Income before provision for income taxes (4,373)   (4,373)  
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 8,734 7,936 17,110 15,621
Other income, net 2 44 41 47
Income before provision for income taxes $ (8,732) $ (7,892) $ (17,069) $ (15,574)