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Segment Information (Long-lived Assets by Geographical Areas) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
United States [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 126,330 $ 126,455
International [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 7,143 $ 7,150