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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Summary of investments
The following table summarizes our investments as of December 31, 2015 and 2014 (in thousands):
 
December 31,
 
2015
 
2014
“Available-for-sale” equity securities, at cost basis
$
20,022

 
$
21,898

Unrealized gains
118,392

 
53,625

Unrealized losses
(793
)
 
(1,258
)
“Available-for-sale” equity securities, at fair value
137,621

 
74,265

Investments accounted for under cost method
215,844

 
162,124

Total investments
$
353,465

 
$
236,389
Schedule of net investment income
The following table outlines our investment income, which is classified in other income in the accompanying consolidated statements of income (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Investment gains
$
35,035

 
$
11,613

 
$
7,050

Investment losses
(16,093
)
 
(9,287
)
 
(1,480
)
Investment income
$
18,942

 
$
2,326

 
$
5,570