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Revenues - Contract Asset and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenue Recognition [Abstract]    
Short-term unbilled receivables, net $ 17,879 $ 13,895
Long-term unbilled receivables, net 14,460 17,205
Total contract assets 32,339 31,100
Short-term deferred revenues, net 114,726 100,053
Long-term deferred revenues 14,141 5,673
Total contract liabilities $ 128,867 $ 105,726