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Other comprehensive (loss) income (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of changes in the balances of each component of other comprehensive income (loss)
Changes in the balances of each component of other comprehensive (loss) income and the related tax effects are as follows:
 
Three Months Ended 
 June 30, 2018
 
Three Months Ended 
 June 30, 2017
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
Net unrealized (losses) gains on investments:
 
 
 
 
 
 
 
Change in net unrealized gains and losses on investments
(3,074
)
(646
)
(2,428
)
 
548

193

355

Less: reclassification adjustment for net gains included in net income
(292
)
(61
)
(231
)
 
(145
)
(51
)
(94
)
 
(3,366
)
(707
)
(2,659
)
 
403

142

261

Foreign currency translation adjustments
(4,575
)
(537
)
(4,038
)
 
4,334

1,130

3,204

Other comprehensive (loss) income
(7,941
)
(1,244
)
(6,697
)
 
4,737

1,272

3,465

 
 
 
 
 
 
 
 
 
Six Months Ended 
 June 30, 2018
 
Six Months Ended 
 June 30, 2017
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
Before-Tax Amount
Tax Expense (Benefit)
Net-of-Tax Amount
 
($000 omitted)
Net unrealized (losses) gains on investments:
 
 
 
 
 
 
 
Change in net unrealized gains and losses on investments
(13,208
)
(2,774
)
(10,434
)
 
4,343

1,521

2,822

Less: reclassification adjustment for net gains included in net income
(607
)
(127
)
(480
)
 
(710
)
(249
)
(461
)
 
(13,815
)
(2,901
)
(10,914
)
 
3,633

1,272

2,361

Foreign currency translation adjustments
(6,854
)
(1,224
)
(5,630
)
 
6,014

1,485

4,529

Other comprehensive (loss) income
(20,669
)
(4,125
)
(16,544
)
 
9,647

2,757

6,890