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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Values of Assets Within Fair Value Hierarchy
The following table summarizes the values of our assets and liabilities as of the dates indicated within the fair value hierarchy (in thousands):
 
 
Level 1
 
Level 2
 
Level 3
 
Investments Measured at NAV (1)
 
Total
As of December 31, 2017
 
 

 
 

 
 

 
 
 
 

Investments in trading securities
 
$
48,998

 
$
—

 
$
—

 
$
2,326

 
$
51,324

Total financial instruments
 
$
48,998

 
$
—

 
$
—

 
$
2,326

 
$
51,324

 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2016
 
 

 
 

 
 

 
 
 
 

Investments in trading securities
 
$
53,319

 
$
—

 
$
—

 
$
3,166

 
$
56,485

Total financial instruments
 
$
53,319

 
$
—

 
$
—

 
$
3,166

 
$
56,485

 
 
 
 
 
 
 
 
 
 
 
(1) Comprised of certain investments measured at fair value using NAV as a practical expedient. These investments were recategorized and are no longer included within Level 2 of the valuation hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in our Consolidated Balance Sheets.