Accounts Receivable

12 Months Ended

Dec. 31, 2011

Accounts Receivable

Accounts Receivable

(6) Accounts Receivable

        Accounts receivable consists of the following:

	December 31,
	2011		2010
	(In thousands)
Billed accounts receivable	$	137,456	$	163,004
Unbilled—scheduled billings		26,475		31,305
Costs and estimated earnings in excess of billings		19,850		29,344
		183,781		223,653
Less allowance for doubtful accounts		1,422		7,367
Accounts receivable, net	$	182,359	$	216,286

        The activity in the allowance for doubtful accounts consists of the following:

			Additions
					Deductions			Effect of foreign exchange rate changes
	Balance at beginning of period		Charge to cost and expense								Balance at end of period
					Write-offs
	(In thousands)
Year ended December 31, 2009	$	3,919		2,250		(3,055	)		49		$	3,163
Year ended December 31, 2010	$	3,163		6,369		(2,092	)		(73	)	$	7,367
Year ended December 31, 2011	$	7,367		337		(6,280	)		(2	)	$	1,422