XML 81 R69.htm IDEA: XBRL DOCUMENT v3.6.0.2
Share Capital, Option Plans and Share-Based Payments - Additional Information (Details)
 3 Months Ended 6 Months Ended
Dec. 21, 2016
shares
Dec. 19, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Jul. 26, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock split ratio 2            
Share sub-division (in shares) 1            
Dividends declared per common share (in dollars per share) | $ / shares     $ 0.115 $ 0.1 $ 0.23 $ 0.2  
Payments of dividends | $     $ 27,900,000 $ 24,200,000 $ 55,650,000 $ 47,528,000  
Preference shares issued (in shares)     0   0    
Number of shares issued (in shares)   19,810,604          
Proceeds from issuance of common shares | $   $ 584,600,000     $ 604,223,000 0  
Equity issuance costs | $   $ 19,600,000          
Equity issuance costs paid | $         $ 18,127,000 $ 0  
Common shares repurchased (in shares)     0 450,000 0 450,000  
Stock repurchase amount | $       $ 10,600,000   $ 10,600,000  
Issuance of treasury stock (in shares)     341,588 414,156 349,922    
Authorized repurchase amount | $             $ 200,000,000
Stock repurchased under the repurchase plan (in shares)     0   0    
Common shares repurchased and cancelled during period, shares (in shares)       688,872   2,952,496  
Common shares repurchased and cancelled during period, value | $       $ 15,500,000   $ 65,500,000  
Long Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Issuance of treasury stock (in shares)     339,922     414,156  
Offering              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares issued (in shares)   18,500,000          
Price per share (in dollars per share) | $ / shares   $ 30.50          
Over-Allotment Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares issued (in shares)   1,310,604          
Price per share (in dollars per share) | $ / shares   $ 30.50