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Other comprehensive income
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Other comprehensive income
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