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Mortgages and Notes Payable (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Revolving Credit Facility due 2018 [Member] extensions | Jun. 30, 2014 Revolving Credit Facility due 2018 [Member] | Jun. 30, 2014 3.20% (3.363% effective rate) Notes due 2021 [Member] | Jun. 30, 2014 5.21% (3.11% effective rate) Mortgage Loan due 2014 [Member] | Jun. 30, 2014 5.94% (3.32% effective rate) Mortgage Loan due 2014 [Member] | Jun. 30, 2014 Secured indebtedness [Member] | Dec. 31, 2013 Secured indebtedness [Member] | Jun. 30, 2014 Unsecured indebtedness [Member] | Dec. 31, 2013 Unsecured indebtedness [Member] | Jul. 21, 2014 Revolving Credit Facility due 2018 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages and notes payable | $ 2,058,972,000 |  | $ 2,058,972,000 |  | $ 1,956,299,000 |  |  |  |  |  | $ 352,857,000 | $ 488,664,000 | $ 1,706,115,000 | $ 1,467,635,000 |
Aggregate undepreciated book value of secured real estate assets |  |  |  |  |  |  |  |  |  |  | 652,400,000 |  |  |  |
Maximum borrowing capacity on revolving credit facility |  |  |  |  |  | 475,000,000 | 475,000,000 |  |  |  |  |  |  |  |
Maturity date on revolving credit facility |  |  |  |  |  |  | Jan. 01, 2018 |  |  |  |  |  |  |  |
Additional borrowing capacity on revolving credit facility |  |  |  |  |  | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |
Interest rate, basis |  |  |  |  |  | LIBOR plus 110 basis points |  |  |  |  |  |  |  |  |
Interest rate (in hundredths) |  |  |  |  |  | 1.10% |  | 3.20% |  |  |  |  |  |  |
Annual facility fee (in hundredths) |  |  |  |  |  | 0.20% |  |  |  |  |  |  |  |  |
Term of optional extension |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Number of additional maturity extensions |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Amount outstanding on revolving credit facility |  |  |  |  |  | 157,000,000 | 157,000,000 |  |  |  |  |  |  |  | 181,000,000
Outstanding letters of credit on revolving credit facility |  |  |  |  |  | 93,000 | 93,000 |  |  |  |  |  |  |  | 93,000
Unused borrowing capacity on revolving credit facility |  |  |  |  |  | 317,907,000 | 317,907,000 |  |  |  |  |  |  |  | 293,907,000
Principal amount of debt |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  | Jun. 15, 2021 | Jul. 01, 2014 | Aug. 01, 2014 |  |  |  |  |
Original issuance discount |  |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |
Purchase price of debt (in hundredths) |  |  |  |  |  |  |  | 98.983% |  |  |  |  |  |  |
Effective percentage rate (in hundredths) |  |  |  |  |  |  |  | 3.363% |  |  |  |  |  |  |
Deferred financing fees |  |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  |  |
Early repayment of debt |  |  |  |  |  |  |  |  | 123,700,000 | 7,200,000 |  |  |  |  |
Current interest rate (in hundredths) |  |  |  |  |  |  |  |  | 3.11% | 3.32% |  |  |  |  |
Gains/(losses) on debt extinguishment | $ 18,000 | $ 0 | $ 18,000 | $ (164,000) |  |  |  |  |  | $ 100,000 |  |  |  |  |

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