Intangible Assets

12 Months Ended

Dec. 31, 2012

Intangible Assets [Abstract]

Intangible Assets

4.             Intangible Assets

Intangible assets subject to amortization at December 31, 2012 consisted of the following:

	Gross Carrying		Accumulated
(In thousands)	Amount		Amortization		Net
Customer contracts	$	59,305	$	44,571	$	14,734
Acquired technology		29,287		24,299		4,988
Patents		24,337		12,723		11,614
Distributor and provider networks		8,709		6,669		2,040
Perpetual license to survey-based data		29,000		2,708		26,292
Other		5,097		3,586		1,511
Total	$	155,735	$	94,556	$	61,179

Intangible assets subject to amortization at December 31, 2011 consisted of the following:

	Gross Carrying		Accumulated
(In thousans)	Amount		Amortization		Net
Customer contracts	$	59,240	$	37,763	$	21,477
Acquired technology		26,757		23,129		3,628
Patents		24,125		10,205		13,920
Distributor and provider networks		8,709		6,148		2,561
Perpetual license to survey-based data		21,956		1,607		20,349
Other		5,067		3,054		2,013
Total	$	145,854	$	81,906	$	63,948

Intangible assets subject to amortization are being amortized over estimated useful lives ranging from one to 25 years.  Total amortization expense for the years ended December 31, 2012, 2011, and 2010, was $12.6 million, $13.4 million, and $12.4 million, respectively.  The following table summarizes the estimated amortization expense for each of the next five years and thereafter:

(In thousands)
Year ending December 31,
2013	$	12,515
2014		11,087
2015		6,557
2016		4,785
2017		3,129
2018 and thereafter		23,106
Total	$	61,179

Intangible assets not subject to amortization at December 31, 2012 and 2011 consist of a trade name of $29.0 million.  In the fourth quarter of 2011, we decided to discontinue the use of one of our trade names. As a result of this decision, we recorded an impairment loss of $0.9 million in December 2011 to write off this intangible asset.