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Income Taxes - Unrecognized Tax Benefit Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income taxes        
Unrecognized tax benefits $ 18,892 $ 18,453 $ 19,560 $ 21,400
Unrecognized tax benefits, Income tax penalties and interest accrued 2,100 2,100 2,200  
Income tax interest and penalty expenses $ (100) (100) 700  
Number of state audits | item 2      
Amount refunded   2,400 1,700  
Decrease in uncertain tax positions   4,400 3,500  
Potential decrease in unrecognized tax benefit $ 2,700      
Exterran Corporation | Spinoff        
Income taxes        
Indemnification asset 7,868 8,508    
Continuing Operations        
Income taxes        
Unrecognized tax benefits that would impact tax rate if recognized 2,900 3,200 6,900  
Discontinued Operations        
Income taxes        
Unrecognized tax benefits that would impact tax rate if recognized $ 7,900 $ 8,300 $ 6,900