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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Marketable Securities [Abstract]  
Schedule of Available For Sale and Equity Securities
Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of:
 
 
At December 31, 2019
 
 
Cost
 
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

 
 
At December 31, 2018
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
Available for sale debt securities
 
$
103,518

 
$
—

 
$
(1,835
)
 
$
101,683

SEI-sponsored mutual funds
 
7,446

 
—

 
(788
)
 
6,658

Equities and other mutual funds
 
3,434

 
126

 
—

 
3,560

 
 
$
114,398

 
$
126

 
$
(2,623
)
 
$
111,901