NOTE D—GOODWILL AND OTHER INTANGIBLE ASSETS

The Company completes its annual goodwill and indefinite lived intangible impairment analysis in the fourth quarter of each year. The Company determined that it has three reporting units to be evaluated, which are the same as its reportable segments: (i) Patient Care; (ii) Distribution; and (iii) Therapeutic Solutions. The Company completed its annual goodwill and indefinite lived intangible asset impairment in October 2012 and 2011 using a two-step approach, which did not result in an impairment as the fair value of the reporting units is substantially in excess of the carrying value of the underlying assets. The fair value of the Company's reporting units was primarily determined based on the income approach and considered the market and cost approach.

The activity related to goodwill for the two years ended December 31, 2012 and 2011 is as follows:

(In thousands)	Patient Care		Distribution		Therapeutic Solutions		Total

Balance at December 31, 2010	$	456,232	$	38,388	$	96,079	$	590,699
Additions due to acquisitions		17,192		—		851		18,043
Contingent consideration(1)		742		—		—		742

Balance at December 31, 2011	$	474,166	$	38,388	$	96,930	$	609,484
Additions due to acquisitions		63,849		—		964		64,813
Contingent consideration(1)		477		—		—		477

Balance at December 31, 2012	$	538,492	$	38,388	$	97,894	$	674,774

(1): Contingent consideration relates to acquisitions completed prior to the adoption of ASC 805.

The activity related to intangible assets for the two years ended December 31, 2012 and 2011 is as follows:

(In thousands)	Customer Lists			Trade Name ACP		Patents and Other Intangibles			Total

Gross asset value
As of December 31, 2010	$	32,447		$	9,070	$	25,262		$	66,779
Write-offs and other adjustments		—			—		147			147
Additions		2,436			—		692			3,128

As of December 31, 2011		34,883			9,070		26,101			70,054
Additions(1)		13,161			—		1,709			14,870

As of December 31, 2012	$	48,044		$	9,070	$	27,810		$	84,924
Accumulated Amortization
As of December 31, 2010	$	(1,942	)	$	—	$	(8,458	)	$	(10,400	)
Amortization expense		(2,706	)		—		(2,054	)		(4,760	)

As of December 31, 2011		(4,648	)		—		(10,512	)		(15,160	)
Amortization expense		(3,198	)		—		(2,285	)		(5,483	)

As of December 31, 2012		(7,846	)		—		(12,797	)		(20,643	)

Net book value	$	40,198		$	9,070	$	15,013		$	64,281

(1): The weighted average life of the additions to customer lists, patents and other intangibles is 9.7 years.

The $9.1 million ACP trade name has an indefinite life and is tested for recoverability in the annual impairment test. Estimated aggregate amortization expense for definite-lived intangible assets for each of the five years ending December 31 and thereafter is as follows:

(In thousands)

2013	$	6,778
2014		6,731
2015		6,676
2016		5,195
2017		4,720
Thereafter		25,111

	$	55,211