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Indebtedness - Information Regarding Indebtedness (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Mortgage Loans Payable, Net $ 577,453 $ 580,215
Unamortized Premiums (109) (115)
Mortgage Loans Payable, Gross 577,344 580,100
Senior Unsecured Notes, Net 446,326 445,916
Unamortized Discounts 570 980
Senior Unsecured Notes, Gross 446,896 446,896
Unsecured Term Loan 200,000 0
Unsecured Credit Facility 52,000 [1] 173,000 [1]
2016 Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 159,580 159,566
Interest Rate 5.75%  
Effective Interest Rate 5.91%  
Maturity Date Jan. 15, 2016  
2017 Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 54,962 54,960
Interest Rate 7.50%  
Effective Interest Rate 7.52%  
Maturity Date Dec. 01, 2017  
2027 Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 6,066 6,066
Interest Rate 7.15%  
Effective Interest Rate 7.11%  
Maturity Date May 15, 2027  
2028 Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 31,883 31,883
Interest Rate 7.60%  
Effective Interest Rate 8.13%  
Maturity Date Jul. 15, 2028  
2032 Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 10,514 10,514
Interest Rate 7.75%  
Effective Interest Rate 7.87%  
Maturity Date Apr. 15, 2032  
2014 Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 81,536 81,149
Interest Rate 6.42%  
Effective Interest Rate 6.54%  
Maturity Date Jun. 01, 2014  
2017 II Notes
   
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net $ 101,785 $ 101,778
Interest Rate 5.95%  
Effective Interest Rate 6.37%  
Maturity Date May 15, 2017  
Mortgages
   
Debt Instrument [Line Items]    
Interest Rate, Minimum 4.03%  
Interest Rate, Maximum 8.26%  
Effective Interest Rate, Minimum 4.03%  
Effective Interest Rate, Maximum 8.26%  
Maturity Date Range, Start Oct. 01, 2014  
Maturity Date Range, End Sep. 01, 2022  
Unsecured Debt
   
Debt Instrument [Line Items]    
Interest Rate 1.905%  
Effective Interest Rate 1.905%  
Maturity Date Jan. 29, 2021  
Line of Credit
   
Debt Instrument [Line Items]    
Interest Rate 1.6544% [1]  
Effective Interest Rate 1.6544% [1]  
Maturity Date Sep. 29, 2017 [1]  
[1] * The maturity date may be extended an additional year at our election, subject to certain restrictions.