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Rental Equipment (Schedule of Rental Equipment, Property and Equipment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ (12,682) $ (12,847)
Rental Equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 385,844 380,090
Accumulated depreciation (167,998) (162,348)
Rental equipment, net of accumulated depreciation 217,846 217,742
Rental Equipment | Compressor units    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 378,366 370,961
Rental Equipment | Work-in-progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 7,478 $ 9,129