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Goodwill and Intangible Assets - Future Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
2014 $ 15,189
2015 14,751
2016 14,094
2017 13,678
2018 $ 13,158