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Other comprehensive income (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Schedule of changes in the balances of each component of other comprehensive income
Changes in the balances of each component of other comprehensive income and the related tax effects are as follows:
 
Three Months Ended 
 June 30, 2017
 
Three Months Ended 
 June 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 investment gains on investments - net:
 
 
 
 
 
 
 
Change in net unrealized gains on investments
548

193

355

 
9,511

3,329

6,182

Less: reclassification adjustment for net gains included in net income
(145
)
(51
)
(94
)
 
(178
)
(63
)
(115
)
 Net unrealized gains
403

142

261

 
9,333

3,266

6,067

 
 
 
 
 
 
 
 
Foreign currency translation adjustments
4,334

1,130

3,204

 
(1,413
)
290

(1,703
)
 
 
 
 
 
 
 
 
Other comprehensive income
4,737

1,272

3,465

 
7,920

3,556

4,364

 
 
 
 
 
 
 
 
 
Six Months Ended 
 June 30, 2017
 
Six Months Ended 
 June 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 investment gains on investments - net:
 
 
 
 
 
 
 
Change in net unrealized gains on investments
4,343

1,521

2,822

 
18,417

6,446

11,971

Less: reclassification adjustment for net gains included in net income
(710
)
(249
)
(461
)
 
(276
)
(97
)
(179
)
Net unrealized gains
3,633

1,272

2,361

 
18,141

6,349

11,792

 
 
 
 
 
 
 
 
Foreign currency translation adjustments
6,014

1,485

4,529

 
3,944

2,352

1,592

 
 
 
 
 
 
 
 
Other comprehensive income
9,647

2,757

6,890

 
22,085

8,701

13,384