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Other comprehensive income (loss) (Tables)
 3 Months Ended
Mar. 31, 2019
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 income (loss) and the related tax effects are as follows:
 
Three Months Ended 
 March 31, 2019
 
Three Months Ended 
 March 31, 2018
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
Net unrealized gains (losses) on investments:
 
 
 
 
 
 
 
Change in net unrealized gains and losses on investments
11,406

2,395

9,011

 
(10,134
)
(2,128
)
(8,006
)
Less: reclassification adjustment for net losses (gains) included in net income
205

43

162

 
(315
)
(66
)
(249
)
 
11,611

2,438

9,173

 
(10,449
)
(2,194
)
(8,255
)
Foreign currency translation adjustments
5,548

960

4,588

 
(2,279
)
(687
)
(1,592
)
Other comprehensive income (loss)
17,159

3,398

13,761

 
(12,728
)
(2,881
)
(9,847
)