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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Marketable Securities [Abstract]  
Investments Available For Sale Investments available for sale classified as non-current assets consist of: 
 
At September 30, 2017
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,317

 
$
106

 
$
(290
)
 
$
7,133

Equities and other mutual funds
3,373

 
357

 
—

 
3,730

Debt securities
71,837

 
—

 
(448
)
 
71,389

 
$
82,527

 
$
463

 
$
(738
)
 
$
82,252

 
At December 31, 2016
 
Cost
Amount
 
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