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Other comprehensive (loss) income (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of changes in the balances of each component of other comprehensive income (loss)
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