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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At June 30, 2017
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,330

 
$
82

 
$
(574
)
 
$
6,838

Equities and other mutual funds
3,213

 
121

 
—

 
3,334

Debt securities
76,372

 
—

 
(459
)
 
75,913

 
$
86,915

 
$
203

 
$
(1,033
)
 
$
86,085

 
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