Intangible Assets

The gross carrying amount and accumulated amortization of our intangible assets, other than goodwill, are as follows:



	September 30, 2011							December 31, 2010
	Gross Assets		Accumulated Amortization			Net		Gross Assets		Accumulated Amortization			Net
	(in thousands)
Core-developed technology	$	394,990	$	(303,634	)	$	91,356	$	378,705	$	(274,198	)	$	104,507
Customer contracts and relationships	292,479		(131,370		)	161,109		282,997		(110,539		)	172,458
Trademarks and trade names	74,701		(63,361		)	11,340		73,194		(59,235		)	13,959
Other	11,092		(10,674		)	418		24,256		(23,510		)	746
Total intangible assets	$	773,262	$	(509,039	)	$	264,223	$	759,152	$	(467,482	)	$	291,670

A summary of the intangible asset account activity is as follows:



	Nine Months Ended September 30,
	2011			2010
	(in thousands)
Beginning balance, intangible assets, gross	$	759,152		$	806,256
Intangible assets acquired	10,297			—
Assets no longer in use written-off	(8,450		)	—
Effect of change in exchange rates	12,263			(33,730		)
Ending balance, intangible assets, gross	$	773,262		$	772,526

Intangible assets that were written-off had been fully amortized and were no longer in use. Intangible assets of our international subsidiaries are recorded in their respective functional currency; therefore, the carrying amounts of intangible assets increase or decrease, with a corresponding change in accumulated OCI, due to changes in foreign currency exchange rates.

Estimated future annual amortization expense is as follows:



Years ending December 31,	Estimated Annual Amortization
	(in thousands)
2011 (amount remaining at September 30, 2011)	$	15,497
2012	48,042
2013	39,582
2014	32,532
2015	26,698
Beyond 2015	101,872
Total intangible assets, net	$	264,223