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Goodwill and Intangibles (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Future amortization expense of intangible assets    
2013   $ 11,497
2014 11,875 7,571
2015 8,803 5,652
2016 6,503 4,435
2017 5,176 3,425
Thereafter   $ 3,660