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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Revenue $ 24,508 $ 13,758 $ 50,884 $ 28,812
Operating costs and expenses 19,679 10,536 40,433 22,261
Other income (expense) 58 17 94 716
Income before provision for income taxes 4,887 3,239 10,545 7,267
Sales
        
Segment Reporting Information [Line Items]        
Revenue   1,901 23,080 5,778
Operating costs and expenses   638 17,118 3,186
Other income (expense) 0 0 0 0
Income before provision for income taxes 3,086 1,263 5,962 2,592
Rental
        
Segment Reporting Information [Line Items]        
Revenue   11,601 27,409 22,482
Operating costs and expenses   4,909 11,383 9,271
Other income (expense) 0 0 0 0
Income before provision for income taxes 7,797 6,692 16,026 13,211
Service & Maintenance
        
Segment Reporting Information [Line Items]        
Revenue   256 395 552
Operating costs and expenses   93 191 231
Other income (expense) 0 0 0 0
Income before provision for income taxes 90 163 204 321
Corporate
        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 6,144 4,896 11,741 9,573
Other income (expense)   17 94 716
Income before provision for income taxes $ (6,086) $ (4,879) $ (11,647) $ (8,857)