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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2015
Related Party Transaction [Line Items]          
Other income, net $ 947 $ 25 $ 1,202 $ 526  
Corporate Joint Venture          
Related Party Transaction [Line Items]          
Other income, net   $ 100 $ 300 $ 500  
Corporate Joint Venture | Maximum          
Related Party Transaction [Line Items]          
Other income, net $ 100        
Corporate Joint Venture | Doosan-PSI, LLC          
Related Party Transaction [Line Items]          
Investment amount with related party         $ 1,000
Percent of noncontrolling interest         50.00%