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Investments (Tables)
12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Securities

The aggregate fair values of investment securities along with unrealized gains and losses determined on an individual investment security basis are as follows:

 

     (In thousands)  
     Amortized Cost      Unrealized Gain      Unrealized (Loss)      Fair Value  

December 31, 2013

           

Corporate bonds

   $ 6,191       $ —         $ —         $ 6,191