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Intangible Assets and Goodwill (Details 2) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 03, 2011
Jun. 30, 2011
Existing technology
Y
Jun. 03, 2011
Existing technology
Jun. 30, 2011
Customer relationships
Y
Jun. 03, 2011
Customer relationships
Jun. 30, 2011
Favorable contracts.
Y
Dec. 31, 2011
Favorable contracts.
Jun. 03, 2011
Favorable contracts.
Jun. 30, 2011
Non-competition agreements
Y
Jun. 03, 2011
Non-competition agreements
Dec. 31, 2010
Patents
Jun. 30, 2011
The group of purchased intangible assets
Y
Dec. 31, 2011
Other non-CRI related Patents
Identified intangible assets assumed in the acquisition of CRI                            
Total   $ 159,200,000   $ 129,400,000   $ 17,300,000     $ 12,200,000   $ 300,000      
Estimated Useful Life (in years)     7   7   2     3     7  
Cash received related to intangible assets               2,300,000            
Purchased patents                            
Patents Acquired                       24,400,000   4,200,000
Cash paid in 2011 related to other non-CRI intangible assets                           1,200,000
Estimated future amortization expense of intangible assets                            
2012 35,309,000                          
2013 32,244,000                          
2014 28,103,000                          
2015 27,452,000                          
2016 26,497,000                          
Thereafter 32,350,000                          
Total $ 181,955,000