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Goodwill and Intangible Assets (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Future estimated amortization expense related to intangible assets  
2013 $ 22,227
2014 16,387
2015 12,442
2016 9,640
2017 7,620
Thereafter 14,452
Total $ 82,768