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Estimated title losses (Tables)
 12 Months Ended
Dec. 31, 2017
Loss Contingency [Abstract]  
Summary of estimated title losses
A summary of estimated title losses is as follows:
 
2017
 
2016
 
2015
 
($000 omitted)
Balances at January 1
462,572

 
462,622

 
495,395

Provisions:
 
 
 
 
 
Current year
71,966

 
72,586

 
68,029

Previous policy years
24,566

 
18,561

 
38,236

Total provisions
96,532

 
91,147

 
106,265

Payments, net of recoveries:
 
 
 
 
 
Current year
(20,335
)
 
(18,836
)
 
(19,182
)
Previous policy years
(63,914
)
 
(73,194
)
 
(104,450
)
Total payments, net of recoveries
(84,249
)
 
(92,030
)
 
(123,632
)
Adjustments related to acquired balance
—

 
—

 
(2,303
)
Effects of changes in foreign currency exchange rates
6,135

 
833

 
(13,103
)
Balances at December 31
480,990

 
462,572

 
462,622

Loss ratios as a percentage of title operating revenues:
 
 
 
 
 
Current year provisions
3.8
%
 
3.8
%
 
3.6
%
Total provisions
5.1
%
 
4.8
%
 
5.6
%