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Other comprehensive income (loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Other Comprehensive Income (Loss)
The following table summarizes the components of other comprehensive income (loss):
 
 
Year Ending December 31,
 
 
2017
 
2016
 
2015
 
 
(in thousands)
Unrealized gains (losses) arising during the period, before income taxes
 
$
9,563

 
$
(830
)
 
$
(2,347
)
Income taxes
 
(3,094
)
 
290

 
821

Unrealized gains (losses) arising during the period, net of income taxes
 
6,469

 
(540
)
 
(1,526
)
Less reclassification adjustment:
 
 
 
 
 
 
Net realized investment gains
 
132

 
154

 
57

Income taxes
 
(47
)
 
(54
)
 
(20
)
Reclassification adjustment included in net income
 
85

 
100

 
37

Other comprehensive income (loss)
 
$
6,384

 
$
(640
)
 
$
(1,563
)