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Accounts Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Trade and other accounts receivable $ 145,879 $ 146,460
Bank promissory notes 16,828 15,759
Revenue in excess of progress billings 18,658 15,926
Allowance for doubtful accounts (7,026) (6,952)
Total accounts receivable 174,339 171,193
Contract receivable $ 17,960 $ 14,045
Interest rate 2.00%