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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax The components of Accumulated other comprehensive loss, net of tax, are as follows: 
 
Foreign
Currency
Translation
Adjustments
 
Unrealized
Gains (Losses)
on Investments
 
Accumulated Other Comprehensive Loss
Balance, January 1, 2018
$
(19,522
)
 
$
(386
)
 
$
(19,908
)
 
 
 
 
 
 
Other comprehensive loss before reclassifications
(7,261
)
 
(1,662
)
 
(8,923
)
Amounts reclassified from accumulated other comprehensive loss
—

 
(32
)
 
(32
)
Net current-period other comprehensive loss
(7,261
)
 
(1,694
)
 
(8,955
)
 
 
 
 
 
 
Balance, September 30, 2018
$
(26,783
)
 
$
(2,080
)
 
$
(28,863
)