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Investment Securities Available for Sale (Tables)
 9 Months Ended
Sep. 30, 2015
Available-for-sale Securities [Abstract]  
Available-for-sale Securities
The components of investment securities available for sale at September 30, 2015 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
63,524

 
$
44,623

 
$
(1,171
)
 
$
106,976

Mutual funds invested in fixed income securities
54,864

 
—

 
—

 
54,864

Marketable debt securities
126,080

 
456

 
—

 
126,536

Total investment securities available for sale
$
244,468

 
$
45,079

 
$
(1,171
)
 
$
288,376


The components of investment securities available for sale at December 31, 2014 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
63,041

 
$
92,255

 
$
(1,104
)
 
$
154,192

Mutual funds invested in fixed income securities
61,485

 
—

 
(1,659
)
 
59,826

Marketable debt securities
130,311

 
2,630

 
(916
)
 
132,025

Total investment securities available for sale
$
254,837

 
$
94,885

 
$
(3,679
)
 
$
346,043
Schedule of Maturity Dates of Fixed Income Securities
The table below summarizes the maturity dates of marketable debt securities at September 30, 2015.

Investment Type:
Market Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
35,433

 
$
—

 
$
35,433

 
$
—

Corporate securities
54,741

 
6,917

 
47,565

 
259

U.S. mortgage-backed securities
6,351

 
1,061

 
5,132

 
158

Commercial mortgage-backed securities
14,537

 
6,632

 
1,793

 
6,112

U.S. asset-backed securities
13,360

 
2,342

 
10,343

 
675

Index-linked U.S. bonds
2,114

 
—

 
2,114

 
—

Total marketable debt securities by maturity dates
$
126,536

 
$
16,952

 
$
102,380

 
$
7,204
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
September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
9,159

 
$
(1,171
)
 
$
—

 
$
—

 
$
9,159

 
$
(1,171
)
 
$
9,159

 
$
(1,171
)
 
$
—

 
$
—

 
$
9,159

 
$
(1,171
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
6,599

 
$
(138
)
 
$
3,534

 
$
(966
)
 
$
10,133

 
$
(1,104
)
Mutual funds invested in fixed income securities
59,826

 
(1,659
)
 
—

 
—

 
59,826

 
(1,659
)
Marketable debt securities

 

 

 

 

 

   U.S. Government securities
22,375

 
(18
)
 
—

 
—

 
22,375

 
(18
)
   Corporate securities
30,896

 
(204
)
 
7,224

 
(131
)
 
38,120

 
(335
)
   U.S. mortgage-backed securities
3,370

 
(26
)
 
—

 
—

 
3,370

 
(26
)
   Commercial mortgage-backed securities
11,332

 
(46
)
 
5,176

 
(432
)
 
16,508

 
(478
)
   U.S. asset-backed securities
15,228

 
(29
)
 
—

 
—

 
15,228

 
(29
)
   Index-linked U.S. bonds
2,098

 
(30
)
 
—

 
—

 
2,098

 
(30
)
 
$
151,724

 
$
(2,150
)
 
$
15,934

 
$
(1,529
)
 
$
167,658

 
$
(3,679
)
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,
 
2015
 
2014
 
2015
 
2014
Gross realized gains on sales
$
129

 
$
100

 
$
13,601

 
$
151

Gross realized losses on sales
(950
)
 
(67
)
 
(1,583
)
 
(189
)
(Loss) gain on sale of investment securities available for sale

$
(821
)
 
$
33

 
$
12,018

 
$
(38
)
 
 
 
 
 
 
 
 
Gross realized losses on other-than-temporary impairments
$
(12,211
)
 
$
—

 
$
(12,211
)
 
$
—