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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Investment Balances
Investment balances are presented in the table below (in thousands). All investments are carried at fair value and are accounted for as trading securities.
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
September 30, 2016:
 
 
 
 
 
 
 
 
U.S. Government and Government agency obligations
 
$
25,209

 
$
38

 
$
—

 
$
25,247

Money market funds
 
12,421

 
—

 
—

 
12,421

Equity funds
 
12,027

 
233

 
(79
)
 
12,181

Marketable securities
 
$
49,657

 
$
271

 
$
(79
)
 
$
49,849

December 31, 2015:
 
 
 
 
 
 
 
 
U.S. Government and Government agency obligations
 
$
50,972

 
$
15

 
$
(15
)
 
$
50,972

Money market funds
 
9,179

 
—

 
—

 
9,179

Equity funds
 
12,653

 
—

 
(484
)
 
12,169

Marketable securities
 
$
72,804

 
$
15

 
$
(499
)
 
$
72,320