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Other comprehensive (loss) income
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Other comprehensive (loss) income
Other comprehensive (loss) income. Changes in the balances of each component of other comprehensive (loss) income and the related tax effects are as follows:
 
Three Months Ended 
 March 31, 2018
 
Three Months Ended 
 March 31, 2017
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
 
($000 omitted)
Net unrealized (losses) gains on investments:
 
 
 
 
 
 
 
Change in net unrealized gains and losses on investments
(10,134
)
(2,128
)
(8,006
)
 
3,795

1,328

2,467

Less: reclassification adjustment for net gains included in net (loss) income
(315
)
(66
)
(249
)
 
(565
)
(198
)
(367
)
 
(10,449
)
(2,194
)
(8,255
)
 
3,230

1,130

2,100

Foreign currency translation adjustments
(2,279
)
(687
)
(1,592
)
 
1,680

355

1,325

Other comprehensive (loss) income
(12,728
)
(2,881
)
(9,847
)
 
4,910

1,485

3,425