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Investment Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 2014
Available-for-sale Securities [Abstract]  
Schedule of Available-for-Sale Securities
The components of investment securities available for sale at December 31, 2014 and 2013 were as follows:

 
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
Loss
 
Fair
Value
2014
 

 
 

 
 

 
 

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

 
$
254,837

 
$
94,801

 
$
(3,595
)
 
$
346,043

 
 
 
 
 
 
 
 
2013
 

 
 

 
 

 
 

Marketable equity securities
$
53,586

 
$
65,851

 
$
(963
)
 
$
118,474

Marketable debt securities
53,063

 
1,497

 
(500
)
 
54,060

 
$
106,649

 
$
67,348

 
$
(1,463
)
 
$
172,534
Schedule of Maturity Dates of Fixed Income Securities
The table below summarizes the maturity dates of fixed income securities at December 31, 2014.

Investment Type:
Market Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 years
U.S. Government securities
$
35,446

 
$
—

 
$
35,446

 
$
—

Corporate securities
56,248

 
7,320

 
40,679

 
8,249

U.S. Government and agency
4,770

 
—

 
4,770

 
—

Commercial mortgage-backed securities
16,508

 
3,761

 
12,747

 
—

U.S. asset-backed securities
16,955

 
3,998

 
12,957

 
—

Index-linked U.S. bonds
2,098

 
—

 
2,098

 
—

Total fixed income securities by maturity dates
$
132,025

 
$
15,079

 
$
108,697

 
$
8,249