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Segment Reporting and Significant Customer Information - Revenue for Individual Countries that Exceed 10% of Total Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue, Major Customer [Line Items]    
Sales Revenue, Services, Net $ 40,195 $ 42,177
UNITED STATES
   
Revenue, Major Customer [Line Items]    
Sales Revenue, Services, Net 24,740 27,846
UNITED KINGDOM
   
Revenue, Major Customer [Line Items]    
Sales Revenue, Services, Net 9,212 8,424
Rest of The World [Member]
   
Revenue, Major Customer [Line Items]    
Sales Revenue, Services, Net $ 6,243 $ 5,907