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Investments (Tables)
6 Months Ended
Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]  
Summary of Investments

Investments at June 30, 2014 and December 31, 2013 consisted of the following:

 

     June 30, 2014
Carrying Value
     December 31,2013 
Carrying Value
 
(in thousands)    Current      Non-
Current
     Current      Non-
Current
 

Certificates of deposit, U.S. Treasury securities and obligations of U.S. Government agencies, Corporate debt and other securities

   $ 12,300       $ 19,021       $ 10,624       $ 16