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Investment Securities Available for Sale (Tables)
 3 Months Ended
Mar. 31, 2015
Available-for-sale Securities [Abstract]  
Available-for-sale Securities
The components of investment securities available for sale at March 31, 2015 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
66,278

 
$
91,505

 
$
(1,242
)
 
$
156,541

Mutual funds invested in fixed income securities
61,893

 
—

 
(1,439
)
 
60,454

Marketable debt securities
130,323

 
5,788

 
(295
)
 
135,816

Total investment securities available for sale
$
258,494

 
$
97,293

 
$
(2,976
)
 
$
352,811


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

 
$
92,244

 
$
(1,093
)
 
$
154,192

Mutual funds invested in fixed income securities
61,485

 
—

 
(1,659
)
 
59,826

Marketable debt securities
130,311

 
2,557

 
(843
)
 
132,025

Total investment securities available for sale
$
254,837

 
$
94,801

 
$
(3,595
)
 
$
346,043
Schedule of Maturity Dates of Fixed Income Securities
The table below summarizes the maturity dates of marketable debt securities at March 31, 2015.

Investment Type:
Market Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
32,423

 
$
—

 
$
32,423

 
$
—

Corporate securities
61,670

 
7,497

 
43,181

 
10,992

U.S. mortgage-backed securities
6,807

 
963

 
5,665

 
179

Commercial mortgage-backed securities
16,763

 
3,895

 
6,785

 
6,083

U.S. asset-backed securities
16,038

 
3,521

 
10,684

 
1,833

Index-linked U.S. bonds
2,115

 
—

 
2,115

 
—

Total marketable debt securities by maturity dates
$
135,816

 
$
15,876

 
$
100,853

 
$
19,087