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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax Components of Accumulated other comprehensive income (loss), net of tax, consisted of:
 
 
Foreign
Currency
Translation
Adjustments
 
Unrealized
Holding
Gains (Losses)
on Investments
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance, January 1, 2015
 
$
(10,088
)
 
$
1,193

 
$
(8,895
)
 
 
 
 
 
 
 
Other comprehensive loss before reclassifications
 
(14,900
)
 
(1,659
)
 
(16,559
)
Amounts reclassified from accumulated other comprehensive loss
 
—

 
164

 
164

Net current-period other comprehensive loss
 
(14,900
)
 
(1,495
)
 
(16,395
)
 
 
 
 
 
 
 
Balance, December 31, 2015
 
$
(24,988
)
 
$
(302
)
 
$
(25,290
)
 
 
 
 
 
 
 
Other comprehensive loss before reclassifications
 
(12,131
)
 
(918
)
 
(13,049
)
Amounts reclassified from accumulated other comprehensive loss
 
—

 
384

 
384

Net current-period other comprehensive loss
 
(12,131
)
 
(534
)
 
(12,665
)
 
 
 
 
 
 
 
Balance, December 31, 2016
 
$
(37,119
)
 
$
(836
)
 
$
(37,955
)
 
 
 
 
 
 
 
Other comprehensive gain before reclassifications
 
17,597

 
190

 
17,787

Amounts reclassified from accumulated other comprehensive loss
 
—

 
260

 
260

Net current-period other comprehensive gain
 
17,597

 
450

 
18,047

 
 
 
 
 
 
 
Balance, December 31, 2017
 
$
(19,522
)
 
$
(386
)
 
$
(19,908
)