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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in carrying amount of goodwill
The changes in the carrying amount of goodwill for the years ended December 31, 2012 and 2011, are as follows (in thousands):

 
2012
 
2011
Goodwill balance at January 1
$
61,144

 
$
58,675

Adjustment related to previous acquisitions
280

 
(228
)
Additions as the result of acquisitions
113,684

 
2,697

Goodwill balance at December 31
$
175,108

 
$
61,144

Other intangible assets

Other intangible assets at December 31, 2012 and 2011, consisted of the following (in thousands):

 
2012
 
Gross
 
 
 
Net
 
Carrying
Amount
 
Accumulated
Amortization
 
Carrying
Amount
Patents
$
7,843

 
$
(2,045
)
 
$
5,798

Distribution agreement
5,176

 
(1,301
)
 
3,875

License agreements
2,733

 
(861
)
 
1,872

Trademarks
7,311

 
(1,362
)
 
5,949

Covenant not to compete
1,035

 
(160
)
 
875

Customer lists
20,468

 
(8,038
)
 
12,430

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
44,833

 
$
(14,034
)
 
$
30,799


 
2011
 
Gross
 
 
 
Net
 
Carrying
Amount
 
Accumulated
Amortization
 
Carrying
Amount
Patents
$
6,455

 
$
(1,704
)
 
$
4,751

Distribution agreement
2,426

 
(900
)
 
1,526

License agreements
1,983

 
(436
)
 
1,547

Trademarks
5,746

 
(1,014
)
 
4,732

Covenant not to compete
315

 
(108
)
 
207

Customer lists
14,277

 
(5,786
)
 
8,491

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
31,469

 
$
(10,215
)
 
$
21,254

Estimated amortization expense

Estimated amortization expense for the intangible assets for the next five years consists of the following as of December 31, 2012 (in thousands):

Year Ending December 31
 
2013
$
13,934

2014
13,264

2015
12,738

2016
12,274

2017
11,917