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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Loss), Net of Taxes
The following table sets forth the balance of the only component of accumulated other comprehensive income (loss) as of June 30, 2018 and December 31, 2017, and the changes in the balance of that component thereof during the six month period ended June 30, 2018, net of taxes.

  
Unrealized Gains
on Available-for-
Sale Securities
 
Balance, December 31, 2017
 
$
9,751
 
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018
  
(9,825
)
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018
  
2,100
 
Total effect of adoption of updated accounting   guidance at January 1, 2018
  
(7,725
)
Other comprehensive loss before reclassifications
  
(8,208
)
Amounts reclassified from accumulated other comprehensive loss
  
(247
)
Net current period other comprehensive loss
  
(8,455
)
Balance, June 30, 2018
 
$
(6,429
)