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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At September 30, 2019
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,477

 
$
105

 
$
(411
)
 
$
7,171

Equities and other mutual funds
3,476

 
666

 
—

 
4,142

Debt securities
89,625

 
642

 
—

 
90,267

 
$
100,578

 
$
1,413

 
$
(411
)
 
$
101,580

 
At December 31, 2018
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,446

 
$
—

 
$
(788
)
 
$
6,658

Equities and other mutual funds
3,434

 
126

 
—

 
3,560

Debt securities
103,518

 
—

 
(1,835
)
 
101,683

 
$
114,398

 
$
126

 
$
(2,623
)
 
$
111,901