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Related Party Transactions - Transactions with Joint Ventures (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2015
Related Party Transaction [Line Items]      
Other income, net $ 211 $ 106  
Corporate Joint Venture | Doosan-PSI, LLC      
Related Party Transaction [Line Items]      
Investment amount with related party     $ 1,000
Percent of noncontrolling interest     50.00%