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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
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 year end:

  
Pre-Tax Amount
 
Tax (Expense) Benefit
 
Net-of-Tax Amount
December 31, 2014
$
6,537

 
$
(2,526
)
 
$
4,011

Changes in net unrealized gain on investments
(3,070
)
 
1,187

 
(1,883
)
Reclassification adjustment for net realized gains
(827
)
 
319

 
(508
)
December 31, 2015
2,640

 
(1,020
)
 
1,620

Changes in net unrealized gain on investments
(629
)
 
167

 
(462
)
Reclassification adjustment for net realized gains
(547
)
 
211

 
(336
)
December 31, 2016
1,464

 
(642
)
 
822

Changes in net unrealized gain on investments
10,647

 
(3,747
)
 
6,900

Reclassification adjustment for net realized gains
(67
)
 
17

 
(50
)
Reclassification due to adoption of ASU 2018-02
—

 
1,549

 
1,549

December 31, 2017
$
12,044

 
$
(2,823
)
 
$
9,221