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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

Goodwill

Goodwill represents the excess of the cost of an acquired business over the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed in a business combination. At December 31, 2014 and 2013, we had $491.6 million and $472.9 million, respectively, of goodwill recorded in our Packaging segment and $55.2 million and $53.9 million, respectively, in our Paper segment on our Consolidated Balance Sheets.

Changes in the carrying amount of our goodwill were as follows (dollars in millions):
 
Packaging
 
Paper
 
Goodwill
Balance at January 1, 2013
$
67.2

 
$

 
$
67.2

Acquisitions
405.7

 
53.9

 
459.6

Balance at December 31, 2013
472.9

 
53.9

 
526.8

Acquisitions (a)
12.2

 

 
12.2

Adjustments related to purchase accounting (b)
6.5

 
1.3

 
7.8

Balance at December 31, 2014
$
491.6

 
$
55.2

 
$
546.8

___________
(a)
In April 2014, we acquired the assets of Crockett Packaging, a corrugated products manufacturer, for $21.2 million, before $0.7 million of working capital adjustments, and recorded $12.2 million of goodwill in our Packaging segment.
(b)
Adjustments relate primarily to the Boise acquisition, see Note 3, Acquisitions, for more information.

Intangible Assets

Intangible assets are comprised of customer relationships and trademarks and trade names.

The weighted average useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):
 
As of December 31, 2014
 
As of December 31, 2013
 
Weighted Average Remaining Useful Life (in Years)
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Weighted Average Remaining Useful Life (in Years)
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
Customer relationships
14.3
 
$
311.5

 
$
36.9

 
15.4
 
$
306.4

 
$
16.5

Trademarks and trade names
13.4
 
21.8

 
3.0

 
14.7
 
21.4

 
0.8

Other
2.2
 
0.2

 
0.1

 
3.0
 
0.2

 
0.1

Total intangible assets (excluding goodwill)
14.2
 
$
333.5

 
$
40.0

 
15.4
 
$
328.0

 
$
17.4



Amortization expense was $22.6 million, $6.4 million, and $3.1 million for the years ended December 31, 2014, 2013, and 2012, respectively. Estimated amortization expense of intangible assets over the next five years is expected to approximate $22.6 million (2015), $22.5 million (2016), $22.4 million (2017), $22.2 million (2018), and $21.3 million (2019).

Impairment Testing

We test goodwill for impairment annually in the fourth quarter as of October 1 or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. Additionally, when we experience changes to our business or operating environment, we evaluate the remaining useful lives of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives are necessary. We completed our test in the fourth quarter as of October 1, 2014, and there is no indication of goodwill or intangible asset impairment.