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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Marketable Securities [Abstract]  
Investments Available For Sale Investments available for sale classified as non-current assets consist of: 
 
At March 31, 2018
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,382

 
$
96

 
$
(50
)
 
$
7,428

Equities and other mutual funds
3,483

 
405

 
—

 
3,888

Debt securities
74,431

 
—

 
(2,658
)
 
71,773

 
$
85,296

 
$
501

 
$
(2,708
)
 
$
83,089

 
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