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(Long-Lived Assets by Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of long-lived assets by geographical area    
Long-lived assets $ 16,320 $ 18,312
UNITED STATES
   
Schedule of long-lived assets by geographical area    
Long-lived assets 14,404 16,189
Europe [Member]
   
Schedule of long-lived assets by geographical area    
Long-lived assets $ 1,916 $ 2,123