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RECEIVABLES (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Billed receivables:    
Trade and other receivables $ 363,234 $ 340,091
Less: Allowance for doubtful accounts (7,486) (4,832)
Net billed receivables 355,748 335,259
Unbilled receivables:    
Recoverable costs and estimated earnings not billed 160,727 149,847
Less: Progress payments applied (21,552) (22,044)
Net unbilled receivables 139,175 127,803
Receivables, net $ 494,923 $ 463,062