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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Marketable Securities [Abstract]  
Investments Available For Sale Investments available for sale classified as non-current assets consist of: 
 
At June 30, 2018
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,388

 
$
96

 
$
(355
)
 
$
7,129

Equities and other mutual funds
3,461

 
452

 
—

 
3,913

Debt securities
80,409

 
—

 
(2,432
)
 
77,977

 
$
91,258

 
$
548

 
$
(2,787
)
 
$
89,019

 
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