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Investment Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities The components of investment securities available for sale at December 31, 2017 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
35,020

 
$
10,994

 
$
(1,380
)
 
$
44,634

Mutual funds invested in fixed income securities
20,977

 
93

 
(29
)
 
21,041

Marketable debt securities
84,708

 
106

 
—

 
84,814

Total investment securities available for sale
$
140,705

 
$
11,193

 
$
(1,409
)
 
$
150,489


The components of investment securities available for sale at December 31, 2016 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
34,956

 
$
16,141

 
$
(254
)
 
$
50,843

Mutual funds invested in fixed income securities
20,507

 
81

 
(6
)
 
20,582

Marketable debt securities
85,297

 
181

 
—

 
85,478

Total investment securities available for sale
$
140,760

 
$
16,403

 
$
(260
)
 
$
156,903
Schedule of Maturity Dates of Fixed Income Securities The table below summarizes the maturity dates of marketable debt securities at December 31, 2017.

Investment Type:
Fair Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
28,502

 
$
—

 
$
28,502

 
$
—

Corporate securities
41,329

 
8,854

 
32,475

 
—

U.S. mortgage-backed securities
4,564

 
—

 
18

 
4,546

Commercial mortgage-backed securities
426

 
—

 
—

 
426

Commercial paper
7,027

 
7,027

 
—

 
—

Index-linked U.S. bonds
2,316

 
—

 
2,316

 
—

Foreign fixed-income securities
650

 
—

 
650

 
—

Total marketable debt securities by maturity dates
$
84,814

 
$
15,881

 
$
63,961

 
$
4,972
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, 2017
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
9,523

 
$
(1,380
)
 
$
—

 
$
—

 
$
9,523

 
$
(1,380
)
Mutual funds invested in fixed-income securities
10,483

 
(29
)
 
—

 
—

 
10,483

 
(29
)
 
$
20,006

 
$
(1,409
)
 
$
—

 
$
—

 
$
20,006

 
$
(1,409
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
5,746

 
$
(254
)
 
$
—

 
$
—

 
$
5,746

 
$
(254
)
Mutual funds invested in fixed-income securities
10,253

 
(6
)
 
—

 
—

 
10,253

 
(6
)
 
$
15,999

 
$
(260
)
 
$
—

 
$
—

 
$
15,999

 
$
(260
)
Schedule of Realized Gains (Losses) Gross realized gains and losses on available-for-sale investment securities were as follows:

 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Gross realized gains on sales
 
$
479

 
$
3,408

 
$
13,727

Gross realized losses on sales
 
(310
)
 
(501
)
 
(2,589
)
Gains on sale of investment securities available for sale
 
$
169

 
$
2,907

 
$
11,138

 
 
 
 
 
 
 
Other-than-temporary impairments
 
$
(465
)
 
$
(5,381
)
 
$
(12,846
)