RECEIVABLES (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Billed receivables:
Trade and other receivables	$ 390,306	$ 363,234
Less: Allowance for doubtful accounts	(7,436)	(7,486)
Net billed receivables	382,870	355,748
Unbilled receivables:
Recoverable costs and estimated earnings not billed	225,810	160,727
Less: Progress payments applied	(14,925)	(21,552)
Net unbilled receivables	210,885	139,175
Receivables, net	$ 593,755	$ 494,923

-- None. No documentation exists for this element. --

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- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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The amount of the offset related to government or other customer advances received on a contract when the expected advances will be applied in payment to those particular charges of the receivable.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Amount of unbilled receivables under long-term contracts that have not been billed and were not billable.

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