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Investments (Tables)
 3 Months Ended
Mar. 31, 2017
Investments [Abstract]  
Summary of Investments
Investments primarily comprise strategic investments and deferred compensation investments. Investments consist of the following (in thousands): 
 
March 31,
2017
 
December 31,
2016
Strategic investments:
 
 
 
Investments accounted for under the equity method
$
17,313

 
$
16,707

Investments held at fair value
2,379

 
9,198

Investments held at cost, less impairment
2,790

 
2,789

Total strategic investments
22,482

 
28,694

Other investments
2,234

 
2,285

Total investments
$
24,716

 
$
30,979