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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2017
Investments [Abstract]  
Investments Classified as Available-For-Sale
Marketable securities classified as available-for-sale as of March 31, 2017 and December 31, 2016 were comprised of (in thousands):
 
 
 
March 31, 2017
 
December 31, 2016
 
 
 
 
 
Gross
 
Gross
 
 
 
 
 
Gross
 
Gross
 
 
 
 
 
Amortized
 
Unrealized
 
Unrealized
 
 
 
Amortized
 
Unrealized
 
Unrealized
 
 
 
 
 
Cost
 
Gains
 
Losses
 
Fair Value
 
Cost
 
Gains
 
Losses
 
Fair Value
 
Asset-backed securities
 
$
45,086
 
$
 
$
(13)
 
$
45,073
 
$
23,636
 
$
 
$
(4)
 
$
23,632
 
Corporate debt securities
 
 
70,213
 
 
57
 
 
(12)
 
 
70,258
 
 
67,457
 
 
43
 
 
(6)
 
 
67,494
 
Total
 
$
115,299
 
$
57
 
$
(25)
 
$
115,331
 
$
91,093
 
$
43
 
$
(10)
 
$
91,126