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Consolidated Statement Of Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Shares
Common shares
Additional Paid-in Capital
Accumulated Dividends in Excess of Net Income
Accumulated Other Comprehensive (Loss)/Income
Noncontrolling Interests
Common shares
Preferred Shares
Preferred Shares
Additional Paid-in Capital
Beginning balance (in shares) at Dec. 31, 2014   399,896 68,605,783              
Beginning balance at Dec. 31, 2014 $ 1,692,556 $ 9,997 $ 687 $ 2,281,223 $ (683,991) $ (3,515) $ 88,155      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income, excluding amount attributable to redeemable noncontrolling interests 215,001       210,219   4,782      
Other comprehensive income (loss) - change in value of interest rate swaps (595)         (595)        
Dividends declared to common shareholders (250,388)       (250,388)          
Dividends declared to preferred shareholders (541)       (541)          
Distributions declared to noncontrolling interests (5,269)           (5,269)      
Shares issued (in shares)     813,548              
Shares issued 108,545   $ 8 108,537            
Exercise of stock options (in shares)     29,940              
Exercise of stock options $ 1,991     1,991            
Shares issued under dividend reinvestment plan (in shares) 16,524   16,524              
Shares issued under dividend reinvestment plan $ 2,296     2,296            
Share-based compensation expense, net of forfeitures (in shares)     52,213              
Share-based compensation expense, net of forfeitures 12,074   $ 1 12,073            
Shares withheld for employee taxes (in shares)     (64,227)              
Shares withheld for employee taxes (9,211)     (9,211)            
Conversion and redemption of OP units (in shares)     39,611              
Conversion and redemption of OP units (151)     4,072     (4,223)      
Contributions from noncontrolling interests 34,737           34,737      
Adjustment to redeemable noncontrolling interests (19,114)     (19,114)            
Ending balance (in shares) at Dec. 31, 2015   399,896 69,493,392              
Ending balance at Dec. 31, 2015 1,781,931 $ 9,997 $ 696 2,381,867 (724,701) (4,110) 118,182      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income, excluding amount attributable to redeemable noncontrolling interests 256,170       249,910   6,260      
Other comprehensive income (loss) - change in value of interest rate swaps 1,533         1,533        
Dividends declared to common shareholders (274,402)       (274,402)          
Dividends declared to preferred shareholders (541)       (541)          
Distributions declared to noncontrolling interests (7,546)           (7,546)      
Shares issued (in shares)     2,156,671              
Shares issued 324,191   $ 21 324,170            
Exercise of stock options (in shares)     55,365              
Exercise of stock options $ 4,542   $ 1 4,541            
Shares issued under dividend reinvestment plan (in shares) 15,619   15,619              
Shares issued under dividend reinvestment plan $ 2,387     2,387            
Share-based compensation expense, net of forfeitures (in shares)     134,913              
Share-based compensation expense, net of forfeitures 11,227   $ 2 11,225            
Shares withheld for employee taxes (in shares)     (30,671)              
Shares withheld for employee taxes (4,451)     (4,451)            
Conversion and redemption of OP units (in shares)     170,608              
Conversion and redemption of OP units 0   $ 2 18,677     (18,679)      
Contributions from noncontrolling interests 885           885      
Adjustment to redeemable noncontrolling interests (20,091)     (20,091)            
Ending balance (in shares) at Dec. 31, 2016   399,896 71,995,897              
Ending balance at Dec. 31, 2016 2,075,835 $ 9,997 $ 722 2,718,325 (749,734) (2,577) 99,102      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
January 1, 2017 adoption of new accounting standard - See Note 2 0     83 (83)          
Net income, excluding amount attributable to redeemable noncontrolling interests 293,996       289,914   4,082      
Other comprehensive income (loss) - change in value of interest rate swaps 2,599         2,599        
Dividends declared to common shareholders (287,006)       (287,006)          
Dividends declared to preferred shareholders (2,458)       (2,458)          
Distributions declared to noncontrolling interests $ (5,560)           (5,560)      
Shares issued (in shares)   6,000 826,592              
Shares issued   $ 150,000 $ 8 108,240       $ 108,248 $ 144,965 $ (5,035)
Exercise of stock options (in shares) 152,634   152,634              
Exercise of stock options $ 9,979   $ 2 9,977            
Shares issued under dividend reinvestment plan (in shares) 17,911   17,911              
Shares issued under dividend reinvestment plan $ 2,373     2,373            
Share-based compensation expense, net of forfeitures (in shares)     107,522              
Share-based compensation expense, net of forfeitures 12,371   $ 1 12,370            
Shares withheld for employee taxes (in shares)     (29,709)              
Shares withheld for employee taxes (4,229)     (4,229)            
Conversion and redemption of OP units (in shares)     20,030              
Conversion and redemption of OP units 0   $ 0 2,569     (2,569)      
Contributions from noncontrolling interests 35,331           35,331      
Purchase of noncontrolling interests (5,536)     42     (5,578)      
Adjustment to redeemable noncontrolling interests 10,606     10,606            
Ending balance (in shares) at Dec. 31, 2017   405,896 73,090,877              
Ending balance at Dec. 31, 2017 $ 2,391,514 $ 159,997 $ 733 $ 2,855,321 $ (749,367) $ 22 $ 124,808