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Shareholders' Equity (Details) (USD $)
 1 Months Ended 2 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2011
Feb. 28, 2011
Feb. 28, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2002
Dec. 31, 2012
Mezzanine Operating Partnership Units [Member]
Feb. 12, 2013
Series B [Member]
Sep. 11, 2012
Series B [Member]
May 31, 2012
Series B [Member]
Dec. 31, 2012
Series B [Member]
Sep. 14, 2012
Series B [Member]
Dec. 31, 2011
Series B [Member]
Feb. 07, 2013
Series A [Member]
Dec. 31, 2012
Series A [Member]
Dec. 31, 2011
Series A [Member]
Class of Stock [Line Items]                                  
OP units converted       1,134,000       564,000                  
Carrying value of OP Units reclassified to equity               $ 3,900,000                  
Shares issued in public offering                 2,000,000 4,200,000 400,000            
Dividend rate percentage                       7.25%       8.875%  
Public offering, per share                 $ 24.58 $ 23.94 $ 23.00            
Public offering, realized net proceeds, net offering expenses                 47,600,000 96,800,000 8,600,000            
Additional shares issued to underwriters                 300,000       630,000        
Net proceeds realized from issuance of additional shares to underwriters                 7,100,000       14,500,000        
ATM equity program, shares issued     220,000                 199,000          
ATM equity program, weighted average price per share     $ 24.52                 $ 23.23          
ATM equity program, realized net proceeds, net offering expenses     5,300,000                 4,600,000          
Liquidation preference, per share                       $ 25.00   $ 25.00   $ 25.00 $ 25.00
Redemption price per share                       $ 25.00       $ 25.00  
Shares of Redeemable Preferred Stock redeemed and purchased                             1,408,000 4,992,000  
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased                             35,400,000 126,400,000  
Preferred stock redemption costs                               1,200,000  
Preferred stock accrued dividends                               1,600,000  
Stock price as percentage of market value 100.00% 98.00%                              
Shares issued under DRIP       1,000 693,000                        
Price per share issued under DRIP       $ 4.96 $ 6.02                        
Net proceeds from issuance of common stock shares under DRIP       6,000 4,100,000                        
Remaining shares authorized under DRIP       2,854,000                          
Number of OP units called by warrants             83,000                    
Warrant exercise price             $ 13.50                    
Cash received from litigation settlement         225,000                        
Shares issued to connection to litigation settlement         39,000                        
Price per share         $ 5.78                        
Proceeds from issuance of common stock         225,000                        
Dividends paid to common shareholders       14,402,000 24,705,000 22,445,000                      
Accrued preferred stock dividends       $ 1,700,000 $ 1,600,000