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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2012
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
 
At December 31, 2012
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
12,953

 
$
376

 
$
(13
)
 
$
13,316

Equities and other mutual funds
 
2,610

 
—

 
—

 
2,610

Debt securities
 
55,923

 
4,020

 
—

 
59,943

 
 
$
71,486

 
$
4,396

 
$
(13
)
 
$
75,869

 
 
 
At December 31, 2011
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
8,243

 
$
48

 
$
(360
)
 
$
7,931

Other mutual funds
 
69

 
10

 
—

 
79

Debt securities
 
70,604

 
4,394

 
—

 
74,998

 
 
$
78,916

 
$
4,452

 
$
(360
)
 
$
83,008
Trading Securities
Trading securities of the Company consist of: 
 
 
At December 31, 2012
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
LSV-sponsored mutual funds
 
$
2,049

 
$
2,657

 
$
—

 
$
4,706

Other investments
 
1,228

 
—

 
(25
)
 
1,203

 
 
$
3,277

 
$
2,657

 
$
(25
)
 
$
5,909

 
 
 
At December 31, 2011
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SIV securities
 
$
146,363

 
$
—

 
$
(94,955
)
 
$
51,408

LSV-sponsored mutual funds
 
2,049

 
1,653

 
—

 
3,702

Other investments
 
1,215

 
—

 
—

 
1,215

 
 
$
149,627

 
$
1,653

 
$
(94,955
)
 
$
56,325