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Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The table below details the components of accumulated other comprehensive income at period end:

  
Pre-Tax Amount
 
Tax (Expense) Benefit
 
Net-of-Tax Amount
December 31, 2017
$
12,044

 
$
(2,823
)
 
$
9,221

Reclassification adjustment for adoption of ASU 2016-01(1)
(12,300
)
 
2,962

 
(9,338
)
Adjusted balance at January 1, 2018
(256
)
 
139

 
(117
)
 
 
 
 
 
 
Changes in net unrealized gains on investments
(18,407
)
 
4,316

 
(14,091
)
Reclassification adjustment for realized gains
674

 
(168
)
 
506

September 30, 2018
$
(17,989
)
 
$
4,287

 
$
(13,702
)

(1) Reflects the fair value changes on equity securities as of December 31, 2017, which are reclassified under the new accounting guidance. Refer to Note 2 in these Notes to Unaudited Condensed Consolidated Financial Statements for further information.