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Accounts Receivable | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
Accounts Receivable | 11. Accounts Receivable As of December 31, 2018 and 2017, Accounts receivable consisted of the following:
(in thousands) | December 31, 2018 |  | December 31, 2017 |
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 |
As of December 31, 2018 and December 31, 2017, Noncurrent receivables consisted of the following:
(in thousands) | December 31, 2018 |  | December 31, 2017 |
Noncurrent receivables | $45,061 |  | $32,811

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