Certain Balance Sheet Components



Accounts receivable, net	June 30, 2012		December 31, 2011
	(in thousands)
Trade receivables (net of allowance of $5,381and $6,049)	$	348,106	$	328,845
Unbilled receivables	45,959		42,796
Total accounts receivable, net	$	394,065	$	371,641

At June 30, 2012 and December 31, 2011, $18.7 million and $2.5 million were recorded within trade receivables as billed but not yet paid by customers in accordance with contract retainage provisions. At June 30, 2012 and December 31, 2011, contract retainage amounts that were unbilled and classified as unbilled receivables were $8.9 million and $7.4 million. These contract retainage amounts within trade receivables and unbilled receivables are expected to be collected within the following 12 months.

At June 30, 2012, long-term unbilled receivables totaled $1.2 million. These long-term unbilled receivables are classified within other long-term assets as collection is not anticipated within the following 12 months. We had no long-term retainage contract receivables at June 30, 2012 as we expect to collect all contract retainage receivables within the following 12 months. At December 31, 2011, long-term unbilled receivables and long-term retainage contracts totaled $31.5 million.



Allowance for doubtful account activity	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
	(in thousands)
Beginning balance	$	5,983		$	9,030		$	6,049		$	9,045
Provision (release) of doubtful accounts, net	(230		)	298			(290		)	(48		)
Accounts written-off	(22		)	(505		)	(261		)	(552		)
Effects of change in exchange rates	(350		)	157			(117		)	535
Ending balance	$	5,381		$	8,980		$	5,381		$	8,980



Inventories	June 30, 2012		December 31, 2011
	(in thousands)
Materials	$	97,000	$	112,470
Work in process	14,232		16,306
Finished goods	85,415		67,061
Total inventories	$	196,647	$	195,837

Our inventory levels may vary period to period as a result of our factory scheduling and the timing of contract fulfillments, which may include the buildup of finished goods for shipment.

Consigned inventory is held at third-party locations; however, we retain title to the inventory until purchased by the third-party. Consigned inventory, consisting of raw materials and finished goods, was $5.8 million and $7.4 million at June 30, 2012 and December 31, 2011, respectively.



Property, plant, and equipment, net	June 30, 2012			December 31, 2011
	(in thousands)
Machinery and equipment	$	269,433		$	269,611
Computers and purchased software	79,471			74,885
Buildings, furniture, and improvements	141,699			140,064
Land	27,183			26,126
Construction in progress, including purchased equipment	19,212			20,687
Total cost	536,998			531,373
Accumulated depreciation	(284,913		)	(268,703		)
Property, plant, and equipment, net	$	252,085		$	262,670



Depreciation expense	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
	(in thousands)
Depreciation expense	$	15,019	$	16,571	$	30,333	$	32,505