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Stockholder's Equity and Dividend Restrictions (Tables)
12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of net income and capital and surplus, as determined in accordance with statutory accounting principles and practices as prescribed by the National Association of Insurance Commissioners
The Company’s net income and capital and surplus, as determined in accordance with statutory accounting principles and practices as prescribed by the National Association of Insurance Commissioners (“NAIC”), is as follows:  
 
 
Year Ended December 31,
 
 
December 31,
 
 
2017
 
2016
 
2015
 
 
2017
 
2016
Net income
 
$
170,018

 
$
100,657

 
$
187,232

Capital and surplus
 
$
1,129,510

 
$
1,053,333