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RECEIVABLES (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Billed receivables:    
Trade and other receivables $ 386,098 $ 418,968
Less: Allowance for doubtful accounts (8,755) (8,733)
Net billed receivables 377,343 410,235
Unbilled receivables:    
Recoverable costs and estimated earnings not billed 264,807 231,067
Less: Progress payments applied (7,206) (9,108)
Net unbilled receivables 257,601 221,959
Receivables, net $ 634,944 $ 632,194