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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Investments Classified as Available-For-Sale
Marketable securities classified as available-for-sale as of December 31, 2015 and 2014 were comprised of (in thousands):
 
 
 
December 31, 2015
 
December 31, 2014
 
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
Asset-backed securities
 
$
20,748
 
$
 
$
(9)
 
$
20,739
 
$
46,660
 
$
 
$
(36)
 
$
46,624
 
Corporate debt securities
 
 
116,821
 
 
29
 
 
(41)
 
 
116,809
 
 
89,126
 
 
8
 
 
(37)
 
 
89,097
 
Total
 
$
137,569
 
$
29
 
$
(50)
 
$
137,548
 
$
135,786
 
$
8
 
$
(73)
 
$
135,721