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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
segment
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Number of operating segments 1  
Revenue $ 22,322 $ 23,983
Operating costs and expenses 17,960 17,846
Other income, net 3 305
Income before provision for income taxes 4,365 6,442
Rental
    
Segment Reporting Information [Line Items]    
Revenue 18,789 16,007
Operating costs and expenses 7,956 6,812
Other income, net 0 0
Income before provision for income taxes 10,833 9,195
Sales
    
Segment Reporting Information [Line Items]    
Revenue 3,338 7,835
Operating costs and expenses 2,235 4,882
Other income, net 0 0
Income before provision for income taxes 1,103 2,953
Service & Maintenance
    
Segment Reporting Information [Line Items]    
Revenue 195 141
Operating costs and expenses 84 68
Other income, net 0 0
Income before provision for income taxes 111 73
Corporate
    
Segment Reporting Information [Line Items]    
Revenue 0 0
Operating costs and expenses 7,685 6,084
Other income, net 3 305
Income before provision for income taxes $ (7,682) $ (5,779)