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Other comprehensive (loss) earnings (Tables)
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Schedule of Changes in the Balances of Each Component of Other Comprehensive Earnings (Loss)
Changes in the balances of each component of other comprehensive (loss) earnings are as follows:

 
For the Three Months Ended 
 March 31, 2015
 
For the Three Months Ended 
 March 31, 2014
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
 
($000 omitted)
Foreign currency translation adjustments
(8,942
)
(2,443
)
(6,499
)
 
(4,140
)
(1,732
)
(2,408
)
Unrealized gains on investments:
 
 
 
 
 
 
 
Change in unrealized gains on investments
4,245

1,486

2,759

 
6,402

2,241

4,161

Less: reclassification adjustment for gains included in net earnings
(1,002
)
(351
)
(651
)
 
(202
)
(71
)
(131
)
  Net unrealized gains
3,243

1,135

2,108

 
6,200

2,170

4,030

 
 
 
 
 
 
 
 
Other comprehensive (loss) earnings
(5,699
)
(1,308
)
(4,391
)
 
2,060

438

1,622