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Other comprehensive (loss) income (Tables)
 9 Months Ended
Sep. 30, 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 
 September 30, 2018
 
Three Months Ended 
 September 30, 2017
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
Net unrealized (losses) gains on investments:
 
 
 
 
 
 
 
Change in net unrealized gains and losses on investments
(2,417
)
(507
)
(1,910
)
 
95

32

63

Less: reclassification adjustment for net gains included in net income
(174
)
(37
)
(137
)
 
(508
)
(177
)
(331
)
 
(2,591
)
(544
)
(2,047
)
 
(413
)
(145
)
(268
)
Foreign currency translation adjustments
1,620

480

1,140

 
5,817

1,676

4,141

Other comprehensive (loss) income
(971
)
(64
)
(907
)
 
5,404

1,531

3,873

 
 
 
 
 
 
 
 
 
Nine Months Ended 
 September 30, 2018
 
Nine Months Ended 
 September 30, 2017
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
Net unrealized (losses) gains on investments:
 
 
 
 
 
 
 
Change in net unrealized gains and losses on investments
(15,625
)
(3,281
)
(12,344
)
 
4,438

1,553

2,885

Less: reclassification adjustment for net gains included in net income
(781
)
(164
)
(617
)
 
(1,218
)
(426
)
(792
)
 
(16,406
)
(3,445
)
(12,961
)
 
3,220

1,127

2,093

Foreign currency translation adjustments
(5,234
)
(744
)
(4,490
)
 
11,831

3,161

8,670

Other comprehensive (loss) income
(21,640
)
(4,189
)
(17,451
)
 
15,051

4,288

10,763