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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Marketable Securities [Abstract]  
Investments Available For Sale
Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: 
 
At March 31, 2020
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
Available-for-sale debt securities
$
98,322

 
$
2,203

 
$
—

 
$
100,525

SEI-sponsored mutual funds
7,508

 
—

 
(1,126
)
 
6,382

Equities and other mutual funds
3,595

 
56

 
—

 
3,651

 
$
109,425

 
$
2,259

 
$
(1,126
)
 
$
110,558

 
At December 31, 2019
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
Available-for-sale debt securities
$
104,193

 
$
605

 
$
—

 
$
104,798

SEI-sponsored mutual funds
7,564

 
125

 
(39
)
 
7,650

Equities and other mutual funds
3,637

 
832

 
—

 
4,469

 
$
115,394

 
$
1,562

 
$
(39
)
 
$
116,917