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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2015
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of:
 
 
At December 31, 2015
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
8,474

 
$

 
$
(742
)
 
$
7,732

Equities and other mutual funds
 
2,857

 
68

 

 
2,925

Debt securities
 
70,308

 
329

 

 
70,637

 
 
$
81,639

 
$
397

 
$
(742
)
 
$
81,294


 
 
At December 31, 2014
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
8,685

 
$
134

 
$
(95
)
 
$
8,724

Equities and other mutual funds
 
2,695

 
169

 

 
2,864

Debt securities
 
64,333

 
1,688

 

 
66,021

 
 
$
75,713

 
$
1,991

 
$
(95
)
 
$
77,609