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Revenues, Contract Assets and Contract Liabilities - Schedule of Disaggregation by Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Total Revenues $ 108,470 $ 96,992 $ 329,521 $ 273,121
Fixed Price Contracts [Member]        
Total Revenues 37,352 39,703 126,249 119,733
Product Sales [Member]        
Total Revenues $ 71,118 $ 57,289 $ 203,272 $ 153,388