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Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Notes)
 3 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated balances of other comprehensive income, net of tax, for the three months ended March 31, 2018 (in thousands):
 
Unrealized Gains (Losses) on Investments
 
Foreign Currency Translation
 
Total
Beginning balance
$
—

 
$
(29,090
)
 
$
(29,090
)
     Other comprehensive (loss) income
(2,500
)
 
6,310

 
3,810

Net current period other comprehensive (loss) income
(2,500
)
 
6,310

 
3,810

Ending balance
$
(2,500
)
 
$
(22,780
)
 
$
(25,280
)