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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2013
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At March 31, 2013
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
SEI-sponsored mutual funds
$
9,153

 
$
817

 
$
(9
)
 
$
9,961

Equities and other mutual funds
2,600

 
—

 
(15
)
 
2,585

Debt securities
56,419

 
3,330

 
—

 
59,749

 
$
68,172

 
$
4,147

 
$
(24
)
 
$
72,295


 
At December 31, 2012
 
Cost
Amount
 
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