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Investments (Tables)
 6 Months Ended
Jun. 30, 2016
Investments [Abstract]  
Summary of investments
The following table summarizes our investments as of June 30, 2016, and December 31, 2015 (in thousands):
 
June 30, 2016
 
December 31, 2015
Available-for-sale equity securities, cost basis
$
36,469

 
$
20,022

Unrealized gains
78,400

 
118,392

Unrealized losses
(2,322
)
 
(793
)
Available-for-sale equity securities, at fair value
112,547

 
137,621

Investments accounted for under cost method
247,503

 
215,844

Total investments
$
360,050

 
$
353,465


    
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):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Investment gains
$
14,715

 
$
7,773

 
$
20,606

 
$
13,710

Investment losses
(5,039
)
 
(5,652
)
 
(6,821
)
 
(7,877
)
Investment income
$
9,676

 
$
2,121

 
$
13,785

 
$
5,833