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Mortgages and Notes Payable (Details) (USD $) |  |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Revolving Credit Facility due 2015 [Member] extensions | Apr. 21, 2014 Revolving Credit Facility due 2015 [Member] | Mar. 31, 2014 Secured indebtedness [Member] | Dec. 31, 2013 Secured indebtedness [Member] | Mar. 31, 2014 Unsecured indebtedness [Member] | Dec. 31, 2013 Unsecured indebtedness [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Mortgages and notes payable | $ 2,012,554,000 | $ 1,956,299,000 |  |  | $ 485,525,000 | $ 488,664,000 | $ 1,527,029,000 | $ 1,467,635,000
Aggregate undepreciated book value of secured real estate assets |  |  |  |  | 817,900,000 |  |  |
Maximum borrowing capacity on revolving credit facility |  |  | 475,000,000 |  |  |  |  |
Maturity date on revolving credit facility |  |  | Jan. 01, 2018 |  |  |  |  |
Additional borrowing capacity on revolving credit facility |  |  | 75,000,000 |  |  |  |  |
Number of additional maturity extensions |  |  | 2 |  |  |  |  |
Term of optional extensions (in years) |  |  | 6 months |  |  |  |  |
Interest rate, basis |  |  | LIBOR plus 110 basis points |  |  |  |  |
Interest rate, basis spread |  |  | 1.10% |  |  |  |  |
Annual facility fee (in hundredths) |  |  | 0.20% |  |  |  |  |
Amount outstanding on revolving credit facility |  |  | 275,000,000 | 409,000,000 |  |  |  |
Outstanding letters of credit on revolving credit facility |  |  | 100,000 | 100,000 |  |  |  |
Unused borrowing capacity on revolving credit facility |  |  | $ 199,900,000 | $ 65,900,000 |  |  |  |

X
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- Definition The period for which there is an option to extend the maturity date of the facility, debt instrument or loan receivable, in years. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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