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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
Below is a summary of our marketable securities as of September 30, 2017 (in thousands):
 
 
September 30, 2017
 
 
Cost or Amortized Cost
 
Unrealized Gains
 
Estimated Fair Value
Marketable securities
 
$
276,467

 
$
3,159

 
$
279,626