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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At June 30, 2019
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,464

 
$
108

 
$
(341
)
 
$
7,231

Equities and other mutual funds
3,477

 
634

 
—

 
4,111

Debt securities
94,905

 
424

 
—

 
95,329

 
$
105,846

 
$
1,166

 
$
(341
)
 
$
106,671

 
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