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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Investment Balances
All investments are carried at fair value and are accounted for as trading securities. Investment balances are presented below (in thousands):
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
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

Marketable securities
 
$
50,681

 
$
678

 
$
(35
)
 
$
51,324

 
 
 
 
 
 
 
 
 
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

Marketable securities
 
$
56,459

 
$
204

 
$
(178
)
 
$
56,485
Other Revenue
The following amounts, except for income tax amounts, are included in our Consolidated Statements of Comprehensive Income under the heading “Other revenues” for the years indicated (in thousands):
 
 
2017
 
2016
 
2015
Realized gains
 
$
395

 
$
113

 
$
283

Realized losses
 
(96
)
 
(220
)
 
(43
)
Net realized gains (losses)
 
$
299

 
$
(107
)
 
$
240

Income tax expense (benefit) from gains (losses)
 
$
105

 
$
(37
)
 
$
84

Interest income – trading
 
$
334

 
$
282

 
$
143

Dividend income
 
$
302

 
$
265

 
$
284

Unrealized gains/(losses)
 
$
617

 
$
510

 
$
(613
)