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Investment Securities Available for Sale (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
The components of investment securities available for sale at June 30, 2017 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
35,425

 
$
12,427

 
$
(55
)
 
$
47,797

Mutual funds invested in fixed income securities
20,734

 
141

 
—

 
20,875

Marketable debt securities
77,201

 
350

 
—

 
77,551

Total investment securities available for sale
$
133,360

 
$
12,918

 
$
(55
)
 
$
146,223


The components of investment securities available for sale at December 31, 2016 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
34,956

 
$
16,141

 
$
(254
)
 
$
50,843

Mutual funds invested in fixed income securities
20,507

 
81

 
(6
)
 
20,582

Marketable debt securities
85,297

 
181

 
—

 
85,478

Total investment securities available for sale
$
140,760

 
$
16,403

 
$
(260
)
 
$
156,903
Schedule of Maturity Dates of Fixed Income Securities
The table below summarizes the maturity dates of marketable debt securities at June 30, 2017.

Investment Type:
Market Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
28,527

 
$
—

 
$
28,527

 
$
—

Corporate securities
40,128

 
7,766

 
32,362

 
—

U.S. mortgage-backed securities
5,648

 
—

 
26

 
5,622

Commercial mortgage-backed securities
440

 
—

 
—

 
440

Index-linked U.S. bonds
2,307

 
—

 
2,307

 
—

Foreign fixed-income securities
501

 
—

 
501

 
—

Total marketable debt securities by maturity dates
$
77,551

 
$
7,766

 
$
63,723

 
$
6,062
Schedule of Unrealized Loss on Investments
The available-for-sale investment securities with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:

 
In loss position for
 
 
 
 
 
Less than 12 months
 
12 months or more
 
 
 
 
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Total Fair Value
 
Total Unrealized Losses
June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
5,945

 
$
(55
)
 
$
—

 
$
—

 
$
5,945

 
$
(55
)
 
$
5,945

 
$
(55
)
 
$
—

 
$
—

 
$
5,945

 
$
(55
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
5,746

 
$
(254
)
 
$
—

 
$
—

 
$
5,746

 
$
(254
)
Mutual funds invested in fixed income securities
10,253

 
(6
)
 
—

 
—

 
10,253

 
(6
)
 
$
15,999

 
$
(260
)
 
$
—

 
$
—

 
$
15,999

 
$
(260
)
Schedule of Realized Gains (Losses)
Gross realized gains and losses on available-for-sale investment securities were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Gross realized gains on sales
$
90

 
$
206

 
$
295

 
$
955

Gross realized losses on sales
(53
)
 
(67
)
 
(108
)
 
(249
)
Gains on sale of investment securities available for sale
$
37

 
$
139

 
$
187

 
$
706

 
 
 
 
 
 
 
 
Gross realized losses on other-than-temporary impairments
$
(87
)
 
$
(49
)
 
$
(126
)
 
$
(4,862
)