Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Acquisition (Details)

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Real Estate - Acquisition (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 01, 2015
USD ($)
unit
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]            
Real Estate Investment Property, at Cost   $ 2,647,305   $ 2,647,305   $ 2,470,953
Real estate rental revenue   78,243 $ 73,413 227,325 $ 214,278  
Operating Income (Loss)   14,903 18,553 71,198 46,729  
Payments to Acquire Real Estate       151,682 154,126  
Business Acquisition, Pro Forma Revenue   78,243 76,853 234,095 224,488  
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax   1,626 2,205 29,811 (323)  
Business Acquisition, Pro Forma Net Income (Loss)   $ 1,626 $ 2,205 $ 29,811 $ 106,208  
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares   $ 0.02 $ 0.03 $ 0.43 $ 1.59  
Wellington [Member]            
Business Acquisition [Line Items]            
Number of Units in Real Estate Property | unit 711          
Real Estate Investment Property, at Cost $ 167,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land 30,548          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land for Development 15,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 116,563          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 4,889          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 167,000          
Payments to Acquire Real Estate 166,700          
Credits Received At Settlement $ 300          
Property Acquired [Member] | Wellington [Member]            
Business Acquisition [Line Items]            
Real estate rental revenue   $ 3,441   $ 3,441    
Operating Income (Loss)   $ (1,463)   $ (1,463)    
Leasing Commissions Absorption Costs Member | Wellington [Member]            
Business Acquisition [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 months