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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investment Balances
Investment balances are presented in the table below (in thousands):
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Market
Value
September 30, 2017:
 
 
 
 
 
 
 
 
U.S. Government and Government agency obligations
 
$
26,093

 
$
12

 
$
(14
)
 
$
26,091

Money market funds
 
9,925

 
—

 
—

 
9,925

Equity funds
 
11,510

 
578

 
(11
)
 
12,077

 
 
$
47,528

 
$
590

 
$
(25
)
 
$
48,093

December 31, 2016:
 
 
 
 
 
 
 
 
U.S. Government and Government agency obligations
 
$
30,275

 
$
—

 
$
(2
)
 
$
30,273

Money market funds
 
14,127

 
—

 
—

 
14,127

Equity funds
 
12,057

 
204

 
(176
)
 
12,085

 
 
$
56,459

 
$
204

 
$
(178
)
 
$
56,485