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

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
38,113

 
$
19,835

 
$
—

 
$
57,948

Mutual funds invested in fixed income securities
20,405

 
262

 
—

 
20,667

Marketable debt securities
96,212

 
826

 
—

 
97,038

Total investment securities available for sale
$
154,730

 
$
20,923

 
$
—

 
$
175,653


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 September 30, 2016.

Investment Type:
Market Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
30,985

 
$
—

 
$
30,985

 
$
—

Corporate securities
35,669

 
3,366

 
31,871

 
432

U.S. mortgage-backed securities
8,293

 
—

 
819

 
7,474

Commercial mortgage-backed securities
1,776

 
—

 
—

 
1,776

U.S. asset-backed securities
891

 
—

 
891

 
—

Commercial paper
19,424

 
19,424

 
—

 
—

Total marketable debt securities by maturity dates
$
97,038

 
$
22,790

 
$
64,566

 
$
9,682
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
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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Gross realized gains on sales
$
224

 
$
129

 
$
1,157

 
$
13,601

Gross realized losses on sales
(82
)
 
(950
)
 
(309
)
 
(1,583
)
Gains (losses) on sale of investment securities available for sale
$
142

 
$
(821
)
 
$
848

 
$
12,018

 
 
 
 
 
 
 
 
Gross realized losses on other-than-temporary impairments
$
(54
)
 
$
(12,211
)
 
$
(4,916
)
 
$
(12,211
)