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Cash and Cash Equivalents and Available for Sale Securities (Tables)
6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available for sale Securities
Available for sale securities, including carrying value and estimated fair values, are summarized as follows:

 
As of June 30, 2017
 
 
Amortized Cost
 
Fair Value
 
Unrealized
Loss
 
 
(in thousands)
 
Corporate debt securities
131,552

 
131,545

 
7

 
Total
$
131,552

 
$
131,545

 
$
7