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Rental Equipment, Property and Equipment (Depreciation Expense by Product Line) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Depreciation $ 23,143 $ 21,954 $ 21,191
Operating Segments      
Property, Plant and Equipment [Line Items]      
Depreciation 275    
Corporate      
Property, Plant and Equipment [Line Items]      
Depreciation 235 50 29
Rentals | Operating Segments      
Property, Plant and Equipment [Line Items]      
Depreciation 22,596 21,611 20,873
Sales | Operating Segments      
Property, Plant and Equipment [Line Items]      
Depreciation   271 267
Service & Maintenance | Operating Segments      
Property, Plant and Equipment [Line Items]      
Depreciation $ 37 $ 22 $ 22