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Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
Below is a summary of our marketable securities as of June 30, 2017 (in thousands):
 
 
June 30, 2017
 
 
Cost or Amortized Cost
 
Unrealized Gains
 
Estimated Fair Value
Marketable securities
 
$
276,368

 
$
1,704

 
$
278,072