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Other comprehensive income (loss)
 12 Months Ended
Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Other comprehensive income (loss)
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
)

The sale of an available-for-sale security results in amounts being reclassified from accumulated other comprehensive income to realized gains or losses in current period earnings. The related tax effect of the reclassification adjustment is recorded in income tax expense in current period earnings. See Note 2 for additional information.