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Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Trade and other accounts receivable $ 157,171 $ 146,460
Bank promissory notes 19,525 15,759
Revenue in excess of progress billings 30,957 15,926
Allowance for doubtful accounts (7,715) (6,952)
Total accounts receivable 199,938 171,193
Contract receivable $ 29,688 $ 14,045
Interest rate 2.00%