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Other comprehensive (loss) income (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of changes in other comprehensive income (loss)
Changes in the balances of each component of other comprehensive (loss) income and the related tax effects are as follows: 
 
For the Year Ended
December 31, 2018
 
For the Year Ended
December 31, 2017
 
For the Year Ended
December 31, 2016
 
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
(13,336
)
(2,848
)
(10,488
)
 
11,050

2,696

8,354

 
(2,385
)
982

(3,367
)
Net unrealized gains on investments:
 

 

 

 
 

 

 

 
 

 

 

Change in net unrealized gains on investments
(11,294
)
(2,372
)
(8,922
)
 
2,718

952

1,766

 
544

190

354

Less: reclassification adjustment for net gains included in net income
(1,167
)
(245
)
(922
)
 
(3,210
)
(1,124
)
(2,086
)
 
(2,940
)
(1,029
)
(1,911
)
 
(12,461
)
(2,617
)
(9,844
)
 
(492
)
(172
)
(320
)
 
(2,396
)
(839
)
(1,557
)
Other comprehensive (loss) income
(25,797
)
(5,465
)
(20,332
)
 
10,558

2,524

8,034

 
(4,781
)
143

(4,924
)