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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
Non-controlling interests
Beginning balance at Dec. 31, 2015 $ 2,892,896 $ 976 $ 3,662,864 $ (458,577) $ (386,793) $ (1,913) $ 76,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 42,940     41,730     1,210
Other comprehensive income 32         32  
Net share awards 6,453   (2,306)   8,759    
Employee share purchase plan 65   63   2    
Change in classification of deferred compensation plan (2,376)   (2,376)        
Change in redemption value of non-qualified share awards (6,810)     (6,810)      
Conversions of operating partnership units 0   134       (134)
Cash distributions declared to equity holders (69,037)     (67,618)     (1,419)
Other (8) (1) (7)        
Ending balance at Mar. 31, 2016 2,864,155 975 3,658,372 (491,275) (378,032) (1,881) 75,996
Beginning balance at Dec. 31, 2015 2,892,896 976 3,662,864 (458,577) (386,793) (1,913) 76,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Diversification of share awards within deferred compensation plan 25,400            
Ending 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 35,989     34,861     1,128
Other comprehensive income 34         34  
Net share awards 7,884   468   7,416    
Employee share purchase plan 78   78        
Common share options exercised 77   77        
Change in classification of deferred compensation plan (4,234)   (4,234)        
Change in redemption value of non-qualified share awards 3,925     3,925      
Diversification of share awards within deferred compensation plan 1,642   954 688      
Conversions of operating partnership units 0   117       (117)
Cash distributions declared to equity holders (69,349)     (67,936)     (1,413)
Ending balance at Mar. 31, 2017 $ 3,071,599 $ 978 $ 3,675,737 $ (317,642) $ (365,923) $ (1,829) $ 80,278