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Segment Information (Long-lived Assets by Geographic Areas) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 159,566 $ 138,704
International [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 13,846 $ 11,171