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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Segment Reporting [Abstract]    
Number of operating segments | segment 1  
Segment Reporting Information [Line Items]    
Revenue $ 21,576 $ 24,741
Operating costs and expenses 17,809 18,954
Other income, net 17 39
Income before provision for income taxes 3,784 5,826
Operating Segments | Rental    
Segment Reporting Information [Line Items]    
Revenue 16,408 20,603
Operating costs and expenses 5,694 7,727
Other income, net 0 0
Income before provision for income taxes 10,714 12,876
Operating Segments | Sales    
Segment Reporting Information [Line Items]    
Revenue 4,910 3,912
Operating costs and expenses 3,932 2,813
Other income, net 0 0
Income before provision for income taxes 978 1,099
Operating Segments | Service & Maintenance    
Segment Reporting Information [Line Items]    
Revenue 258 226
Operating costs and expenses $ 111 $ 38
Other income, net
Income before provision for income taxes $ 147 $ 188
Corporate    
Segment Reporting Information [Line Items]    
Revenue 0 0
Operating costs and expenses 8,072 8,376
Other income, net 17 39
Income before provision for income taxes $ (8,055) $ (8,337)