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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Total
Preferred Shares [Member]
Common Shares [Member]
Additional Paid-in-Capital [Member]
Accumulated Distributions in Excess of Net Income [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interests [Member]
Beginning balance at Dec. 31, 2014 $ 1,508,920 $ 94,016 $ 23 $ 2,763,374 $ (1,372,051) $ 404 $ 23,154
Beginning balance (in shares) at Dec. 31, 2014   1,935,400 233,278,037        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Redemption of noncontrolling OP units for common shares       165     (165)
Redemption of noncontrolling OP units for common shares (in shares)     32,780        
Repurchase of common shares (18,431)     (18,431)      
Repurchase of common shares (in shares)     (2,216,799)        
Issuance of common shares upon conversion of convertible notes 3,630     3,630      
Issuance of common shares upon conversion of convertible notes (in shares)     519,664        
Issuance of common shares and deferred compensation amortization, net 28,099     28,099      
Issuance of common shares and deferred compensation amortization, net (in shares)     2,961,543        
Acquisition of consolidated joint venture partner's equity interest (1,234)       (1,247)   13
Dividends/distributions (171,001)       (167,313)   (3,688)
Net Income 114,891       111,703   3,188
Other comprehensive income (loss) (2,343)         (2,343)  
Ending balance at Dec. 31, 2015 1,462,531 $ 94,016 $ 23 2,776,837 (1,428,908) (1,939) 22,502
Ending balance (in shares) at Dec. 31, 2015   1,935,400 234,575,225        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Redemption of noncontrolling OP units for common shares       210     (210)
Redemption of noncontrolling OP units for common shares (in shares)     48,549        
Repurchase of common shares (8,973)     (8,973)      
Repurchase of common shares (in shares)     (1,184,113)        
Issuance of common shares upon conversion of convertible notes 12,027     12,027      
Issuance of common shares upon conversion of convertible notes (in shares)     1,892,269        
Exercise of employee common share options (1,101)     (1,101)      
Exercise of employee common share options, net (in shares)     170,412        
Issuance of common shares and deferred compensation amortization, net 21,737   $ 1 21,736      
Issuance of common shares and deferred compensation amortization, net (in shares)     2,534,835        
Dividends/distributions (171,086)       (167,682)   (3,404)
Net Income 96,450       95,624   826
Other comprehensive income (loss) 906         906  
Ending balance at Dec. 31, 2016 1,412,491 $ 94,016 $ 24 2,800,736 (1,500,966) (1,033) 19,714
Ending balance (in shares) at Dec. 31, 2016   1,935,400 238,037,177        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Redemption of noncontrolling OP units for common shares 0     584     (584)
Redemption of noncontrolling OP units for common shares (in shares)     140,746        
Exercise of employee common share options 478     478      
Exercise of employee common share options, net (in shares)     151,106        
Issuance of common shares and deferred compensation amortization, net 24,673     24,673      
Issuance of common shares and deferred compensation amortization, net (in shares)     2,360,052        
Acquisition of consolidated joint venture partner's equity interest (7,951)     (7,951)      
Dividends/distributions (177,583)       (174,341)   (3,242)
Net Income 86,629       85,583   1,046
Other comprehensive income (loss) 2,098         2,098  
Ending balance at Dec. 31, 2017 $ 1,340,835 $ 94,016 $ 24 $ 2,818,520 $ (1,589,724) $ 1,065 $ 16,934
Ending balance (in shares) at Dec. 31, 2017   1,935,400 240,689,081