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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     1  
Segment Reporting Information [Line Items]        
Revenue $ 16,181 $ 21,193 $ 54,951 $ 70,164
Operating costs and expenses 14,358 17,395 47,488 59,660
Total other income (expense), net 8 13 16 54
Income before provision for income taxes 1,831 3,811 7,479 10,558
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 7,532 8,261 23,193 25,371
Total other income (expense), net 8 13 16 54
Income before provision for income taxes (7,524) (8,248) (23,177) (25,317)
Rental | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 13,157 18,491 44,220 58,806
Operating costs and expenses 4,513 7,327 15,618 22,062
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 8,644 11,164 28,602 36,744
Sales | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 2,536 2,468 9,746 10,672
Operating costs and expenses 2,191 1,740 8,359 7,706
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 345 728 1,387 2,966
Service & Maintenance | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 488 234 985 686
Operating costs and expenses 122 70 318 151
Total other income (expense), net 0 0
Income before provision for income taxes $ 366 164 $ 667 535
Retirement of Rental Equipment | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue   0   0
Operating costs and expenses   (3)   4,370
Total other income (expense), net   0   0
Income before provision for income taxes   $ 3   $ (4,370)