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Investments (Tables)
 9 Months Ended
Sep. 30, 2015
Investments [Abstract]  
Summary of investments
The following table summarizes our investments as of September 30, 2015, and December 31, 2014 (in thousands):
 
September 30, 2015
 
December 31, 2014
“Available-for-sale” marketable equity securities, cost basis
$
31,399

 
$
21,898

Unrealized gains
107,518

 
53,625

Unrealized losses
(3,650
)
 
(1,258
)
“Available-for-sale” marketable equity securities, at fair value
135,267

 
74,265

Investments accounted for under cost method
195,303

 
162,124

Total investments
$
330,570

 
$
236,389


    
Schedule of net investment income
The following table outlines our investment income (loss), which is classified in other income in the accompanying consolidated statements of income (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Investment gains
$
8,658

 
$
3,256

 
$
22,368

 
$
9,481

Investment losses
(3,280
)
 
(3,485
)
 
(11,157
)
 
(8,725
)
Investment income (loss)
$
5,378

 
$
(229
)
 
$
11,211

 
$
756