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Investments (Tables)
12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
At December 31, 2013 investments classified as available-for-sale securities were as follows:
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Debt Securities:
 
 
 
 
 
 
 
U.S. treasury securities
$
124,861

 
$
88

 
$

 
$
124,949

Corporate debt securities
24,236

 

 
2,213

 
22,023

 
$
149,097

 
$
88

 
$
2,213

 
$
146,972

Contractual Maturities of Investments
At December 31, 2013, the contractual maturities of investments classified as available-for-sale were as follows:
 
Cost
 
Fair Value
Due in one year or less
$
124,861

 
$
124,949

Due after one year through five years
24,236

 
22,023

 
$
149,097

 
$
146,972