RECEIVABLES

Receivables primarily include amounts billed to customers, unbilled charges on long-term contracts consisting of amounts recognized as sales but not billed, and other receivables. Substantially all amounts of unbilled receivables are expected to be billed and collected within one year. An immaterial amount of unbilled receivables are subject to retainage provisions. The amount of claims and unapproved change orders within our receivables balances are immaterial.

The composition of receivables is as follows:



(In thousands)	September 30, 2015			December 31, 2014
Billed receivables:
Trade and other receivables	$	371,949		$	363,241
Less: Allowance for doubtful accounts	(6,179		)	(5,619		)
Net billed receivables	365,770			357,622
Unbilled receivables:
Recoverable costs and estimated earnings not billed	157,226			150,526
Less: Progress payments applied	(12,061		)	(12,668		)
Net unbilled receivables	145,165			137,858
Receivables, net	$	510,935		$	495,480