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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Marketable Securities [Abstract]  
Investments Available For Sale Investments available for sale classified as non-current assets consist of:
 
 
At December 31, 2017
 
 
Cost
 
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


 
 
At December 31, 2016
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
7,357

 
$
24

 
$
(996
)
 
$
6,385

Equities and other mutual funds
 
2,968

 
228

 
—

 
3,196

Debt securities
 
74,843

 
—

 
(391
)
 
74,452

 
 
$
85,168

 
$
252

 
$
(1,387
)
 
$
84,033