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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Total revenue $ 23,548 $ 19,290 $ 24,508 $ 26,376 $ 18,645 $ 17,701 $ 13,758 $ 15,054 $ 93,722 $ 65,158 $ 53,908
Operating costs and expenses                 73,507 50,298 42,544
Other income (expense)                 (4) 769 (64)
Income before provision for income taxes                 20,211 15,629 11,300
Sales
                      
Segment Reporting Information [Line Items]                      
Total revenue                 36,375 15,419 12,370
Operating costs and expenses                 25,816 9,194 8,010
Other income (expense)                 0 0 0
Income before provision for income taxes                 10,559 6,225 4,360
Rental
                      
Segment Reporting Information [Line Items]                      
Total revenue                 56,477 48,619 40,670
Operating costs and expenses                 23,737 20,742 16,205
Other income (expense)                 0 0 0
Income before provision for income taxes                 32,740 27,877 24,465
Service & Maintenance
                      
Segment Reporting Information [Line Items]                      
Total revenue                 870 1,120 868
Operating costs and expenses                 354 458 535
Other income (expense)                 0 0 0
Income before provision for income taxes                 516 662 333
Corporate
                      
Segment Reporting Information [Line Items]                      
Total revenue                 0 0 0
Operating costs and expenses                 23,600 19,904 17,794
Other income (expense)                 (4) 769 (64)
Income before provision for income taxes                 $ (23,604) $ (19,135) $ (17,858)