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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     1  
Segment Reporting Information [Line Items]        
Revenue $ 17,194 $ 24,230 $ 38,770 $ 48,971
Operating costs and expenses 15,321 23,311 33,130 42,265
Total other income (expense), net (9) 2 8 41
Income before provision for income taxes 1,864 921 5,648 6,747
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Operating costs and expenses 7,589 8,734 15,661 17,110
Total other income (expense), net (9) 2 8 41
Income before provision for income taxes (7,598) (8,732) (15,653) (17,069)
Rental | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 14,655 19,712 31,063 40,315
Operating costs and expenses 5,411 7,008 11,105 14,735
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 9,244 12,704 19,958 25,580
Sales | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 2,300 4,292 7,210 8,204
Operating costs and expenses 2,236 3,153 6,168 5,966
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 64 1,139 1,042 2,238
Service & Maintenance | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 239 226 497 452
Operating costs and expenses 85 43 196 81
Total other income (expense), net 0 0
Income before provision for income taxes $ 154 183 $ 301 371
Retirement of Rental Equipment | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue   0   0
Operating costs and expenses   4,373   4,373
Total other income (expense), net   0   0
Income before provision for income taxes   $ (4,373)   $ (4,373)