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Investments Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Summary of investments
The following table summarizes our investments as of September 30, 2017, and December 31, 2016 (in thousands):
 
September 30, 2017
 
December 31, 2016
Available-for-sale equity securities, cost basis
$
55,433

 
$
41,392

Unrealized gains
50,104

 
25,076

Unrealized losses
(4,915
)
 
(5,783
)
Available-for-sale equity securities, at fair value
100,622

 
60,685

Investments accounted for under cost method
384,640

 
281,792

Total investments
$
485,262

 
$
342,477
Schedule of net investment income
The table below outlines the components of our investment income classified within other income in the accompanying unaudited consolidated statements of income (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Investment gains
$
2,644

 
$
8,115

 
$
8,425

 
$
28,721

Investment losses
(1,599
)
 
(3,849
)
 
(6,418
)
 
(10,670
)
Investment income
$
1,045

 
$
4,266

 
$
2,007

 
$
18,051