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Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2014
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At June 30, 2014
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
SEI-sponsored mutual funds
$
7,686

 
$
1,559

 
$

 
$
9,245

Equities and other mutual funds
2,764

 
97

 

 
2,861

Debt securities
71,598

 
1,800

 

 
73,398

 
$
82,048

 
$
3,456

 
$

 
$
85,504

 
At December 31, 2013
 
Cost
Amount
 
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