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Shareholders' Equity (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aug. 06, 2013
Dec. 31, 2002
Dec. 31, 2012
Mezzanine OP Units [Member]
Feb. 12, 2013
Series B [Member]
Sep. 11, 2012
Series B [Member]
May 31, 2012
Series B [Member]
Dec. 31, 2013
Series B [Member]
Dec. 31, 2012
Series B [Member]
Dec. 31, 2011
Series B [Member]
Sep. 14, 2012
Series B [Member]
Mar. 11, 2013
Series A [Member]
Dec. 31, 2013
Series A [Member]
Dec. 31, 2012
Series A [Member]
Dec. 31, 2011
Series A [Member]
Dec. 31, 2013
Limited Partners' OP Units [Member]
Dec. 31, 2013
Mezzanine OP Units [Member]
Jan. 27, 2014
Subsequent Event [Member]
Dec. 31, 2013
Subsequent Event [Member]
Jan. 27, 2014
Subsequent Event [Member]
Series B [Member]
Jan. 13, 2014
Subsequent Event [Member]
Common Stock [Member]
Class of Stock [Line Items]                                              
OP units converted 3,000 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                           6,900,000
Dividend rate percentage                   7.25% 7.25% 7.25%     8.875% 8.875% 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                   900,000
Net proceeds realized from issuance of additional shares to underwriters             7,100,000           14,500,000                   41,300,000
ATM equity program, shares issued                   221,000 199,000                        
At-the-market program, shares authorized       10,000,000                                      
ATM equity program, weighted average price per share                   $ 24.52 $ 23.23                        
ATM equity program, realized net proceeds, net offering expenses                   5,200,000 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%                                            
Remaining shares authorized under DRIP 2,852,000                                            
Redemptions of OP Units, shares 32,000                                   30,000        
Cash outlay for redeemed OP units                                   170,000          
Issuance of OP Units in connection with a property acquisition 270,000                                            
Number of OP units called by warrants         83,000                                    
Warrant exercise price         $ 13.50                                    
Proceeds from issuance of common stock (64,000) (172,000) 4,305,000                                        
Common stock, dividends declared                                       $ 0.05      
Preferred stock dividends declared                                           $ 0.453125  
Dividends payable, date declared                                         Jan. 27, 2014    
Dividends payable, date to be paid                                         Feb. 20, 2014    
Dividends payable, date of record                                         Feb. 10, 2014    
Accrued preferred stock dividends $ 1,600,000 $ 1,700,000