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Other comprehensive income (loss) (Tables)
 9 Months Ended
Sep. 30, 2017
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 
 September 30, 2017
 
Three Months Ended 
 September 30, 2016
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
 
($000 omitted)
Unrealized gains on investments - net:
 
 
 
 
 
 
 
Change in net unrealized gains on investments
95

32

63

 
(405
)
(142
)
(263
)
Less: reclassification adjustment for net gains included in net income
(508
)
(177
)
(331
)
 
(1,330
)
(465
)
(865
)
 Net unrealized gains
(413
)
(145
)
(268
)
 
(1,735
)
(607
)
(1,128
)
 
 
 
 
 
 
 
 
Foreign currency translation adjustments
5,817

1,676

4,141

 
(2,363
)
(555
)
(1,808
)
 
 
 
 
 
 
 
 
Other comprehensive income (loss)
5,404

1,531

3,873

 
(4,098
)
(1,162
)
(2,936
)
 
 
 
 
 
 
 
 
 
Nine Months Ended 
 September 30, 2017
 
Nine Months Ended 
 September 30, 2016
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
 
($000 omitted)
Unrealized gains on investments - net:
 
 
 
 
 
 
 
Change in net unrealized gains on investments
4,438

1,553

2,885

 
18,012

6,304

11,708

Less: reclassification adjustment for net gains included in net income
(1,218
)
(426
)
(792
)
 
(1,606
)
(562
)
(1,044
)
Net unrealized gains
3,220

1,127

2,093

 
16,406

5,742

10,664

 
 
 
 
 
 
 
 
Foreign currency translation adjustments
11,831

3,161

8,670

 
1,581

1,797

(216
)
 
 
 
 
 
 
 
 
Other comprehensive income
15,051

4,288

10,763

 
17,987

7,539

10,448