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Accounts Receivable (Tables) | 6 Months Ended
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Jun. 30, 2016
Receivables [Abstract] |
Schedule of Accounts Receivable | As of June 30, 2016 and December 31, 2015, Accounts receivable consisted of the following:
(in thousands) |  | June 30, 2016 |  | December 31, 2015
Trade and other accounts receivable |  | $150,232 |  |  | $123,179 |
Bank promissory notes |  | 15,017 |  |  | 15,845 |
Revenue in excess of progress billings |  | 19,326 |  |  | 15,889 |
Allowance for doubtful accounts |  | (8,239 | ) |  | (8,530 | )
Total accounts receivable |  | $176,336 |  |  | $146,383 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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