Intangible Assets

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



	December 31, 2013							December 31, 2012
	Gross Assets		Accumulated Amortization			Net		Gross Assets		Accumulated Amortization			Net
	(in thousands)
Core-developed technology	$	428,890	$	(356,017	)	$	72,873	$	407,024	$	(332,763	)	$	74,261
Customer contracts and relationships	291,185		(173,952		)	117,233		292,252		(154,890		)	137,362
Trademarks and trade names	73,117		(67,449		)	5,668		72,770		(65,090		)	7,680
Other	11,089		(11,023		)	66		11,094		(11,026		)	68
Total intangible assets subject to amortization	804,281		(608,441		)	195,840		783,140		(563,769		)	219,371
In-process research and development	—					—		19,400					19,400
Total intangible assets	$	804,281	$	(608,441	)	$	195,840	$	802,540	$	(563,769	)	$	238,771

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



	Year Ended December 31,
	2013			2012
	(in thousands)
Beginning balance, intangible assets, gross	$	802,540		$	749,194
Intangible assets acquired	(1,500		)	43,400
Assets no longer in use written-off	—			(100		)
Effect of change in exchange rates	3,241			10,046
Ending balance, intangible assets, gross	$	804,281		$	802,540

Intangible assets acquired in 2012 were related to the SmartSynch acquisition on May 1, 2012, including IPR&D assets that consisted primarily of projects to upgrade the hardware components of cellular communication modules to be compatible with 3G cellular network standards. Upon completion of these projects in March 2013, we performed a qualitative assessment and determined that it was more than likely that the carrying amount of IPR&D was not impaired. Accordingly, the carrying amount of IPR&D was reclassified as core-developed technology and will be amortized, based on the SmartSynch acquisition discounted cash flow valuation model, over its expected useful life of seven years. For the year ended December 31, 2013, the adjustment of $1.5 million to intangible assets acquired is associated with the correction of an error for a long-term revenue contract from the SmartSynch acquisition. See Note 5 for further discussion of the correction of the error and its impact on goodwill.

During 2012, certain assets that had been fully amortized and were no longer in use were removed from our asset ledger.

Intangible assets of our international subsidiaries are recorded in their respective functional currencies; 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)
2014	$	44,542
2015	35,740
2016	28,113
2017	20,908
2018	14,776
Beyond 2018	51,761
Total intangible assets subject to amortization	$	195,840