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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
segment
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Number of operating segments     1  
Revenue $ 20,258 $ 24,508 $ 44,241 $ 50,884
Operating costs and expenses 14,414 19,679 32,260 40,433
Other income (expense) (79) 58 226 94
Income before provision for income taxes 5,765 4,887 12,207 10,545
Sales
        
Segment Reporting Information [Line Items]        
Revenue 3,329 10,649 11,164 23,080
Operating costs and expenses 1,600 7,563 6,482 17,118
Other income (expense) 0 0 0 0
Income before provision for income taxes 1,729 3,086 4,682 5,962
Rental
        
Segment Reporting Information [Line Items]        
Revenue 16,721 13,671 32,728 27,409
Operating costs and expenses 6,258 5,874 13,070 11,383
Other income (expense) 0 0 0 0
Income before provision for income taxes 10,463 7,797 19,658 16,026
Service & Maintenance
        
Segment Reporting Information [Line Items]        
Revenue 208 188 349 395
Operating costs and expenses 85 98 153 191
Other income (expense) 0 0 0 0
Income before provision for income taxes 123 90 196 204
Corporate
        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 6,471 6,144 12,555 11,741
Other income (expense) (79) 58 226 94
Income before provision for income taxes $ (6,550) $ (6,086) $ (12,329) $ (11,647)