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Other comprehensive income (loss) (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
 
For the Year Ended
December 31, 2016
 
For the Year Ended
December 31, 2015
 
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
11,050

2,696

8,354

 
(2,385
)
982

(3,367
)
 
(16,022
)
(4,877
)
(11,145
)
 
 

 

 

 
 

 

 

 
 

 

 

Unrealized net gains on investments:
 

 

 

 
 

 

 

 
 

 

 

Change in unrealized net gains on investments
2,718

952

1,766

 
544

190

354

 
(5,757
)
(2,016
)
(3,741
)
Less: reclassification adjustment for net gains included in net income (loss)
(3,210
)
(1,124
)
(2,086
)
 
(2,940
)
(1,029
)
(1,911
)
 
(2,501
)
(875
)
(1,626
)
 
(492
)
(172
)
(320
)
 
(2,396
)
(839
)
(1,557
)
 
(8,258
)
(2,891
)
(5,367
)
 
 

 

 

 
 

 

 

 
 

 

 

Other comprehensive income (loss)
10,558

2,524

8,034

 
(4,781
)
143

(4,924
)
 
(24,280
)
(7,768
)
(16,512
)