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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2014
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of:
 
 
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


 
 
At December 31, 2013
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
7,612

 
$
1,242

 
$

 
$
8,854

Equities and other mutual funds
 
2,615

 
164

 

 
2,779

Debt securities
 
71,280

 
410

 

 
71,690

 
 
$
81,507

 
$
1,816

 
$

 
$
83,323