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Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade and other accounts receivable $ 211,244 $ 152,375
Bank promissory notes 19,269 20,255
Revenue in excess of progress billings 37,964
Allowance for doubtful accounts (7,337) (7,919)
Total accounts receivable 223,176 202,675
Noncurrent receivables $ 45,061 $ 32,811