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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
segment
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Number of operating segments 1  
Revenue $ 23,983 $ 26,376
Operating costs and expenses 17,846 20,754
Other income (expense) 305 36
Income before provision for income taxes 6,442 5,658
Sales
    
Segment Reporting Information [Line Items]    
Revenue 7,835 12,432
Operating costs and expenses 4,882 9,555
Other income (expense) 0 0
Income before provision for income taxes 2,953 2,877
Rental
    
Segment Reporting Information [Line Items]    
Revenue 16,007 13,738
Operating costs and expenses 6,812 5,509
Other income (expense) 0 0
Income before provision for income taxes 9,195 8,229
Service & Maintenance
    
Segment Reporting Information [Line Items]    
Revenue 141 206
Operating costs and expenses 68 93
Other income (expense) 0 0
Income before provision for income taxes 73 113
Corporate
    
Segment Reporting Information [Line Items]    
Revenue 0 0
Operating costs and expenses 6,084 5,597
Other income (expense) 305 36
Income before provision for income taxes $ (5,779) $ (5,561)