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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Summary of investments
The following table summarizes our investments as of December 31, 2017 and 2016 (in thousands):

December 31,

2017

2016
Available-for-sale equity securities, cost basis
$
59,740


$
41,392

Unrealized gains
52,193


25,076

Unrealized losses
(2,422
)

(5,783
)
Available-for-sale equity securities, at fair value
109,511


60,685

Investments accounted for under cost method
413,743


281,792

Total investments
$
523,254


$
342,477
Schedule of net investment income
The following table presents the components of our investment income classified within other income in our consolidated statements of operations (in thousands):

Year Ended December 31,

2017

2016

2015
Investment gains
$
12,352


$
28,530


$
35,035

Investment losses
(11,023
)

(11,397
)

(16,093
)
Investment income
$
1,329


$
17,133


$
18,942