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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2015
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At September 30, 2015
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
8,737

 
$
51

 
$
(608
)
 
$
8,180

Equities and other mutual funds
2,927

 
—

 
(105
)
 
2,822

Debt securities
63,703

 
945

 
—

 
64,648

 
$
75,367

 
$
996

 
$
(713
)
 
$
75,650

 
At December 31, 2014
 
Cost
Amount
 
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