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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
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 gain before reclassifications
(6,826
)
 
(1,325
)
 
(8,151
)
Amounts reclassified from accumulated other comprehensive loss
—

 
(162
)
 
(162
)
Net current-period other comprehensive gain
(6,826
)
 
(1,487
)
 
(8,313
)
 
 
 
 
 
 
Balance, June 30, 2018
$
(26,348
)
 
$
(1,873
)
 
$
(28,221
)