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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Marketable Securities [Abstract]  
Investments Available For Sale Investments available for sale classified as non-current assets consist of: 
 
At September 30, 2018
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,392

 
$
107

 
$
(304
)
 
$
7,195

Equities and other mutual funds
3,479

 
652

 
—

 
4,131

Debt securities
75,673

 
—

 
(2,701
)
 
72,972

 
$
86,544

 
$
759

 
$
(3,005
)
 
$
84,298

 
At December 31, 2017
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,369

 
$
110

 
$
(143
)
 
$
7,336

Equities and other mutual funds
3,456

 
458

 
—

 
3,914

Debt securities
77,745

 
—

 
(1,012
)
 
76,733

 
$
88,570

 
$
568

 
$
(1,155
)
 
$
87,983