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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Revenue $ 19,290 $ 17,701 $ 70,174 $ 46,513
Operating costs and expenses 15,048 14,058 55,482 36,320
Other income (expense) (45) (45) 49 671
Income before provision for income taxes 4,197 3,598 14,741 10,864
Sales
        
Segment Reporting Information [Line Items]        
Revenue 4,935   28,015 10,586
Operating costs and expenses 3,126 3,231 20,244 6,417
Other income (expense) 0 0 0 0
Income before provision for income taxes 1,809 1,576 7,771 4,169
Rental
        
Segment Reporting Information [Line Items]        
Revenue 14,120 12,672 41,529 35,153
Operating costs and expenses 5,896 5,622 17,279 14,893
Other income (expense) 0 0 0 0
Income before provision for income taxes 8,224 7,050 24,250 20,260
Service & Maintenance
        
Segment Reporting Information [Line Items]        
Revenue 235 222 630 774
Operating costs and expenses 88 92 279 323
Other income (expense) 0 0 0 0
Income before provision for income taxes 147 130 351 451
Corporate
        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 5,938 5,113 17,680 14,687
Other income (expense) (45) (45) 49 671
Income before provision for income taxes $ (5,983) $ (5,158) $ (17,631) $ (14,016)