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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Schedule of investments
Investments consisted of the following:
 
 
As of December 31,
(in thousands)
 
2017
 
2016
 
 
 
 
 
Investments held at cost
 
$
4,603

 
$
10,774

Equity method investments
 
3,096

 
3,447

Total investments
 
$
7,699

 
$
14,221