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Dividends (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Cash Dividends [Abstract]  
Dividends
Dividends declared in Canadian equivalent dollars during the year were as follows:
 
2017
 
2016
 
Dividend
 
Dividend per share
 
Dividend
 
Dividend per share
Common shares
$
242,509

 
$
0.6084

 
$
149,158

 
$
0.5452

Series A preferred shares
$
5,400

 
$
1.1250

 
$
5,400

 
$
1.1250

Series D preferred shares
$
5,000

 
$
1.2500

 
$
5,000

 
$
1.2500