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Investments (Tables)
 12 Months Ended
Dec. 31, 2014
Investments [Abstract]  
Schedule Of Debt Securities By Contractual Maturity Date
The following table summarizes j2 Global’s debt securities designated as available-for-sale, classified by the contractual maturity date of the security (in thousands):
 
December 31,
2014
 
December 31, 2013
Due within 1 year
$
59,896

 
$
46,339

Due within more than 1 year but less than 5 years
60,178

 
44,865

Due within more than 5 years but less than 10 years
—

 
—

Due 10 years or after
330

 
2,486

Total
$
120,404

 
$
93,690
Schedule Of Available-For-Sale And Trading Securities
The following table summarizes the Company’s investments (in thousands):
 
December 31,
2014
 
December 31, 2013
Available-for-sale
$
156,649

 
$
123,737

Certificates of deposit
65

 
14,403

Total
$
156,714

 
$
138,140
Summary Of Gross Unrealized Gains And Losses And Fair Values
The following table summarizes the gross unrealized gains and losses and fair values for investments classified as available for sale as of December 31, 2014 and December 31, 2013 aggregated by major security type (in thousands):
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
December 31, 2014
 
 
 
 
 
 
 
Corporate debt securities
$
91,456

 
$
147

 
$
(136
)
 
$
91,467

Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
26,848

 
9

 
(13
)
 
26,844

Debt securities issued by states of the United States and political subdivisions of the states
2,088

 
5

 
—

 
2,093

Equity securities
20,611

 
15,634

 
—

 
36,245

Total
$
141,003

 
$
15,795

 
$
(149
)
 
$
156,649

 
 
 
 
 
 
 
 
December 31, 2013
 
 
 
 
 
 
 
Corporate debt securities
$
66,587

 
$
134

 
$
(29
)
 
$
66,692

Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
23,689

 
20

 
(7
)
 
23,702

Debt securities issued by states of the United States and political subdivisions of the states
3,293

 
4

 
(1
)
 
3,296

Equity securities
20,610

 
9,558

 
(121
)
 
30,047

Total
$
114,179

 
$
9,716

 
$
(158
)
 
$
123,737
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of December 31, 2014 and December 31, 2013, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):
 
As of December 31, 2014
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Corporate debt securities
$
57,898

 
$
(131
)
 
$
1,260

 
$
(5
)
 
$
59,158

 
$
(136
)
Debt securities issued by states of the United States and political subdivisions of the states
15,072

 
(13
)
 
—

 
—

 
15,072

 
(13
)
Total
$
72,970

 
$
(144
)
 
$
1,260

 
$
(5
)
 
$
74,230

 
$
(149
)
 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2013
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Corporate debt securities
$
9,944

 
$
(4
)
 
$
1,263

 
$
(3
)
 
$
11,207

 
$
(7
)
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
109

 
(1
)
 
—

 
—

 
109

 
(1
)
Debt securities issued by states of the United States and political subdivisions of the states
26,445

 
(28
)
 
777

 
(2
)
 
27,222

 
(30
)
Equity securities
832

 
(120
)
 
—

 
—

 
832

 
(120
)
Total
$
37,330

 
$
(153
)
 
$
2,040

 
$
(5
)
 
$
39,370

 
$
(158
)