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Condensed Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
Common shares of beneficial interest
Additional paid-in capital
Distributions in excess of net income
Treasury shares, at cost
Accumulated other comprehensive (loss)/income
Non-controlling interests
Beginning balance at Dec. 31, 2016 $ 3,095,553 $ 978 $ 3,678,277 $ (289,180) $ (373,339) $ (1,863) $ 80,680
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 76,303     74,049     2,254
Other comprehensive income 68         68  
Net share awards 13,966 1 5,873   8,092    
Employee share purchase plan 1,127   665   462    
Common share options exercised 77   77        
Change in classification of deferred compensation plan (7,724)   (7,724)        
Change in redemption value of non-qualified share awards (1,916)     (1,916)      
Diversification of share awards within deferred compensation plan 2,627   1,602 1,025      
Conversion of operating partnership units 0   117       (117)
Cash distributions declared to equity holders (138,714)     (135,888)     (2,826)
Other (228) (1) (227)        
Ending balance at Jun. 30, 2017 3,041,139 978 3,678,660 (351,910) (364,785) (1,795) 79,991
Beginning balance at Dec. 31, 2016 3,095,553 978 3,678,277 (289,180) (373,339) (1,863) 80,680
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Diversification of share awards within deferred compensation plan 23,200            
Ending balance at Dec. 31, 2017 3,484,714 1,028 4,137,161 (368,703) (364,066) (57) 79,351
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 80,397     78,066     2,331
Other comprehensive income 8,851         8,851  
Net share awards 13,201   4,899   8,302    
Employee share purchase plan 657   392   265    
Common share options exercised 41   41        
Change in classification of deferred compensation plan (10,635)   (10,635)        
Change in redemption value of non-qualified share awards 976     976      
Diversification of share awards within deferred compensation plan 951   637 314      
Conversion of operating partnership units 0   78       (78)
Common shares repurchased (253)       (253)    
Cash distributions declared to equity holders (150,126)     (147,228)     (2,898)
Other (170) (1) (169)        
Ending balance at Jun. 30, 2018 $ 3,428,604 $ 1,027 $ 4,132,404 $ (436,575) $ (355,752) $ 8,794 $ 78,706