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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investment Balances
Trading securities are presented in the table below (in thousands):
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
September 30, 2018:
 
 
 
 
 
 
 
 
U.S. Government and Government agency obligations
 
$
51,194

 
$
117

 
$
—

 
$
51,311

Money market funds
 
9,978

 
—

 
—

 
9,978

Equity funds
 
9,333

 
545

 
(164
)
 
9,714

Total trading securities
 
$
70,505

 
$
662

 
$
(164
)
 
$
71,003

December 31, 2017:
 
 
 
 
 
 
 
 
U.S. Government and Government agency obligations
 
$
29,367

 
$
21

 
$
(15
)
 
$
29,373

Money market funds
 
9,736

 
—

 
—

 
9,736

Equity funds
 
11,578

 
657

 
(20
)
 
12,215

Total trading securities
 
$
50,681

 
$
678

 
$
(35
)
 
$
51,324