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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2013
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets

Note 7. Goodwill and Other Intangible Assets

Goodwill

Changes in goodwill for the years ended December 31, 2013 and 2012 are as follows (in millions):

Goodwill at January 1, 2012 $ 25.4
       Goodwill acquired   797.1
Goodwill at December 31, 2012   822.5
       Goodwill acquired   372.0
       Translation differences   1.4
Goodwill at December 31, 2013 $       1,195.9

Other Intangible Assets

Other intangible assets consisted of the following at December 31 (in thousands):

  2013   2012
  Gross         Gross      
  Carrying       Accumulated       Carrying       Accumulated
  Amount   Amortization   Amount   Amortization
Developed technology $ 447,842   $ 54,029   $ 385,735   $ 9,058
Patents   14,065     6,523     13,533     4,952
Trademarks and trade names   59,019     3,817     16,877     592
Customer relationships   100,679     10,793     77,779     1,172
Non-compete agreement   10,354     1,249     350     194
Capitalized software development costs   16,612     13,828     15,831     12,996
IPR&D   63,998     -     29,231     -
    712,569   $      90,239          539,336   $      28,964
Accumulated amortization   90,239           28,964      
Net book value of amortizable intangible assets $      622,330         $ 510,372      

For the years ended December 31, 2013, 2012 and 2011, amortization of intangible assets charged to operations was approximately $61.3 million, $8.1 million and $3.8 million, respectively. The weighted average remaining amortization period for intangible assets as of December 31, 2013 and 2012 was approximately 8.0 years and 9.4 years, respectively.

Estimated amortization expense, for all intangible assets, for the five years subsequent to December 31, 2013 is as follows (in thousands):

 
Year ending December 31,      
2014   $ 80,685
2015     80,379
2016     80,287
2017     78,929
2018     72,753
Thereafter           229,297