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Other comprehensive income (Tables)
 3 Months Ended
Mar. 31, 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:
 
For the Three Months Ended 
 March 31, 2017
 
For the Three Months Ended 
 March 31, 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
3,795

1,328

2,467

 
8,906

3,117

5,789

Less: reclassification adjustment for net gains included in net income (loss)
(565
)
(198
)
(367
)
 
(98
)
(34
)
(64
)
 Net unrealized gains
3,230

1,130

2,100

 
8,808

3,083

5,725

 
 
 
 
 
 
 
 
Foreign currency translation adjustments
1,680

355

1,325

 
5,357

2,062

3,295

 
 
 
 
 
 
 
 
Other comprehensive income
4,910

1,485

3,425

 
14,165

5,145

9,020