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Investment Securities Available for Sale (Tables)
 6 Months Ended
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
The components of investment securities available for sale at June 30, 2016 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
38,172

 
$
17,343

 
$
(206
)
 
$
55,309

Mutual funds invested in fixed income securities
20,307

 
211

 
—

 
20,518

Marketable debt securities
83,865

 
1,162

 
—

 
85,027

Total investment securities available for sale
$
142,344

 
$
18,716

 
$
(206
)
 
$
160,854


The components of investment securities available for sale at December 31, 2015 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
47,502

 
$
19,833

 
$
(62
)
 
$
67,273

Mutual funds invested in fixed income securities
20,126

 
—

 
(15
)
 
20,111

Marketable debt securities
94,540

 
52

 
—

 
94,592

Total investment securities available for sale
$
162,168

 
$
19,885

 
$
(77
)
 
$
181,976
Schedule of Maturity Dates of Fixed Income Securities
The table below summarizes the maturity dates of marketable debt securities at June 30, 2016.

Investment Type:
Market Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
27,456

 
$
—

 
$
27,456

 
$
—

Corporate securities
35,660

 
2,271

 
33,389

 
—

U.S. mortgage-backed securities
7,343

 
—

 
49

 
7,294

Commercial mortgage-backed securities
3,675

 
—

 
—

 
3,675

U.S. asset-backed securities
2,115

 
—

 
2,115

 
—

Commercial paper
7,985

 
7,985

 
—

 
—

Index-linked U.S. bonds
793

 
—

 
793

 
—

Total marketable debt securities by maturity dates
$
85,027

 
$
10,256

 
$
63,802

 
$
10,969
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, 2016
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
—

 
$
—

 
$
5,794

 
$
(206
)
 
$
5,794

 
$
(206
)
 
$
—

 
$
—

 
$
5,794

 
$
(206
)
 
$
5,794

 
$
(206
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
5,938

 
$
(62
)
 
$
—

 
$
—

 
$
5,938

 
$
(62
)
Mutual funds invested in fixed income securities
10,053

 
(15
)
 
—

 
—

 
10,053

 
(15
)
 
$
15,991

 
$
(77
)
 
$
—

 
$
—

 
$
15,991

 
$
(77
)
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,
 
2016
 
2015
 
2016
 
2015
Gross realized gains on sales
$
206

 
$
520

 
$
955

 
$
14,084

Gross realized losses on sales
(67
)
 
(710
)
 
(249
)
 
(1,245
)
Gains (losses) on sale of investment securities available for sale

$
139

 
$
(190
)
 
$
706

 
$
12,839

 
 
 
 
 
 
 
 
Gross realized losses on other-than-temporary impairments
$
(49
)
 
$
—

 
$
(4,862
)
 
$
—