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Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2016
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of: 
 
At June 30, 2016
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
22,263

 
$
55

 
$
(923
)
 
$
21,395

Equities and other mutual funds
2,964

 
52

 

 
3,016

Debt securities
62,645

 
1,316

 

 
63,961

 
$
87,872

 
$
1,423

 
$
(923
)
 
$
88,372

 
At December 31, 2015
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
8,474

 
$

 
$
(742
)
 
$
7,732

Equities and other mutual funds
2,857

 
68

 

 
2,925

Debt securities
70,308

 
329

 

 
70,637

 
$
81,639

 
$
397

 
$
(742
)
 
$
81,294