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Other comprehensive income (loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of changes in other comprehensive income (loss) Changes in the balances of each component of other comprehensive income (loss) and the related tax effects are as follows: 
 
For the Year Ended
December 31, 2019
 
For the Year Ended
December 31, 2018
 
For the Year Ended
December 31, 2017
 
Before-Tax
Amount
Tax
Expense
(Benefit)
Net-of-Tax
Amount
 
Before-Tax
Amount
Tax
Expense
(Benefit)
Net-of Tax
 Amount
 
Before-Tax
Amount
Tax 
Expense
(Benefit)
Net-of-Tax
Amount 
 
($000 omitted) 
 
($000 omitted)
 
($000 omitted)
Foreign currency translation adjustments
8,337

1,859

6,478

 
(13,336
)
(2,848
)
(10,488
)
 
11,050

2,696

8,354

Net unrealized gains (losses) on investments:
 

 

 

 
 

 

 

 
 

 

 

Change in net unrealized gains and losses on investments
19,220

4,036

15,184

 
(11,294
)
(2,372
)
(8,922
)
 
2,718

952

1,766

Reclassification adjustment for change in unrealized gains and losses included in net income
519

109

410

 
(1,167
)
(245
)
(922
)
 
(3,210
)
(1,124
)
(2,086
)
 
19,739

4,145

15,594

 
(12,461
)
(2,617
)
(9,844
)
 
(492
)
(172
)
(320
)
Other comprehensive income (loss)
28,076

6,004

22,072

 
(25,797
)
(5,465
)
(20,332
)
 
10,558

2,524

8,034