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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of Short-term investments
Short-term investments as of December 31, 2014 are summarized as follows:
 
Amortized
Cost
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Municipal bonds & notes
$
38,668

 
$
(16
)
 
$
38,652

 
Zero coupon bonds
3,308

 
(2
)
 
3,306

 
Corporate bonds
45,274

 
(41
)
 
45,233

 
Certificate of deposits
35,355

 
—

 
35,355

 
Total short-term investments
$
122,605

 
$
(59
)
 
$
122,546

 
Short-term investments as of December 31, 2015 are summarized as follows:
 
Amortized
Cost
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Municipal bonds & notes
$
16,797

 
$
(7
)
 
$
16,790

 
Zero coupon bonds
500

 
(1
)
 
499

 
Corporate bonds
37,181

 
(77
)
 
37,104

 
Certificate of deposits
48,551

 
—

 
48,551

 
Total short-term investments
$
103,029

 
$
(85
)
 
$
102,944