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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Accumulated Other Comprehensive Income [Abstract]    
Reclassification Out Of Accumulated Other Comprehensive Income [Table Text Block]  
The following table provides details about reclassifications out of accumulated other comprehensive income for the three and six months ended June 30, 2013 (in thousands):
Details about Accumulated Other Comprehensive Income Components
 
Amount Reclassified from Accumulated Other Comprehensive Income
 
Affected Line Item in the Statement of Income
 
 
Three Months Ended June 30, 2013
 
Six Months Ended June 30, 2013
 
 
Cumulative translation adjustment
 
$
—

 
$
116

 
Interest and other income (expense), net
 
 
—

 
116

 
Total, before income taxes
 
 
—

 
(28
)
 
Income tax expense (benefit)
 
 
—

 
88

 
Total, net of tax
 
 
 
 
 
 
 
Unrealized gain (loss) on available-for-sale investments
 
9

 
(4
)
 
Interest and other income (expense), net
 
 
9

 
(4
)
 
Total, before income taxes
 
 
(3
)
 
1

 
Income tax expense (benefit)
 
 
6

 
(3
)
 
Total, net of tax
Total reclassifications for the period
 
$
6

 
$
85

 
Total, net of tax
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the changes in accumulated balances of other comprehensive income, net of tax, for the three months ended June 30, 2013 (in thousands):
 
Unrealized Gains (Losses) on Investments
 
Foreign Currency Translation
 
Total
Beginning balance
$
4,632

 
$
(3,652
)
 
$
980

     Other comprehensive income before reclassifications
2,174

 
(363
)
 
1,811

     Amounts reclassified from accumulated other comprehensive income
6

 
—

 
6

Net current period other comprehensive income
2,180

 
(363
)
 
1,817

Ending balance
$
6,812

 
$
(4,015
)
 
$
2,797

The following table summarizes the changes in accumulated balances of other comprehensive income, net of tax, for the six months ended June 30, 2013 (in thousands):
 
Unrealized Gains (Losses) on Investments
 
Foreign Currency Translation
 
Total
Beginning balance
$
1,811

 
$
(1,899
)
 
$
(88
)
     Other comprehensive income before reclassifications
5,004

 
(2,204
)
 
2,800

     Amounts reclassified from accumulated other comprehensive income
(3
)
 
88

 
85

Net current period other comprehensive income
5,001

 
(2,116
)
 
2,885

Ending balance
$
6,812

 
$
(4,015
)
 
$
2,797