XML 105 R82.htm IDEA: XBRL DOCUMENT v3.3.1.900
SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
shares
Mar. 31, 2013
shares
Dec. 31, 2015
USD ($)
unitholder
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
shares
Sep. 30, 2015
USD ($)
Common Stock [Abstract]            
Stock repurchase program, authorized amount | $           $ 200,000
Shares repurchased in period | shares       0    
Redemption of units, value | $     $ 4,861,000      
Number of holders of common units who received cash for their units | unitholder     4      
Redeemable noncontrolling interest, units exercised for conversion (shares) | shares     272,952      
Preferred Stock [Abstract]            
Preferred stock, shares authorized (in shares) | shares     15,000,000      
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01      
Public offering, shares issued | shares     278,093 246,168 8,772,114  
Operating Partnership            
Common Stock [Abstract]            
Common units outstanding | shares     199,748,131 199,532,908    
Operating Partnership | Common Units            
Common Stock [Abstract]            
Noncontrolling interest conversion, calculation of trailing average of trading price, term (days)     5 days      
Common Stock            
Common Stock [Abstract]            
Common stock, shares authorized (in shares) | shares     350,000,000      
Common stock, par value (in dollars per share) | $ / shares     $ 0.01      
Common stock, shares outstanding (in shares) | shares     170,490,948 170,260,273    
Preferred Stock [Abstract]            
Public offering, shares issued | shares 6,530,193 1,889,105 8,419,298   8,419,298  
Series E preferred stock            
Preferred Stock [Abstract]            
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01    
Public offering, shares issued | shares     6,900,000 6,900,000    
Preferred stock represented by one depository share (in shares) | shares     0.1 0.1    
Dividend rate (in thousandths)     6.625% 6.625%    
Preferred stock, liquidation preference per share | $ / shares     $ 250.00      
Depositary shares, liquidation preference (in dollars per share) | $ / shares     25.00      
Dividends in arrears per depositary share (in dollars per share) | $ / shares     1.65625      
Dividends in arrears per share (in dollars per share) | $ / shares     16.5625      
7.375% Series D Cumulative Redeemable Preferred Stock            
Preferred Stock [Abstract]            
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01    
Preferred stock represented by one depository share (in shares) | shares     0.1 0.1    
Dividend rate (in thousandths)     7.375% 7.375%    
Preferred stock, liquidation preference per share | $ / shares     $ 250      
Depositary shares, liquidation preference (in dollars per share) | $ / shares     25.00      
Dividends in arrears per depositary share (in dollars per share) | $ / shares     $ 1.84375      
Depositary shares outstanding | shares     18,150,000 18,150,000    
Dividends in arrears per share (in dollars per share) | $ / shares     $ 18.4375