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Notes Payable (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended |
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Jun. 11, 2011 | Jun. 30, 2011 years | Jun. 30, 2011 years | Jun. 30, 2011 years | Jun. 30, 2010 | Mar. 31, 2011 | Mar. 31, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Jun. 30, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member] | Jun. 30, 2011 4.625% Notes Due 2010 [Member] | Jun. 30, 2011 4.875 Notes Due 2010 [Member] | Jun. 30, 2011 Line of Credit [Member] | Jun. 30, 2011 Letter of Credit [Member]
Amount of current borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Maturity period of unsecured credit facility |  |  |  | August 2012 |  |  |  |  |  |  |  |  |
Optional extension period of unsecured credit facility |  |  |  | August 2013 |  |  |  |  |  |  |  |  |
Terms of bid rate loans |  |  |  | 180 |  |  |  |  |  |  |  |  |
Value not exceeding the amount available under the line of credit |  |  |  |  |  |  |  |  |  |  |  | 250 |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 | 100,000,000
Outstanding letters of credit under credit facility |  |  |  |  |  |  |  |  |  |  |  | 9,900,000 |
Available amount under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  | 490,100,000 |
Repayment of senior unsecured notes |  | 500,000,000 | 500,000,000 | 500,000,000 |  |  | 88,000,000 |  | 35,000,000 |  |  |  |
Secured third party note payable to one of our fully-consolidated joint ventures |  | 31,500,000 | 31,500,000 | 31,500,000 |  |  |  |  |  |  |  |  |
Investment ownership percentage in fully-consolidated joint venture |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Original maturity period of secured third-party note payable |  |  | August 2011 |  |  |  |  |  |  |  |  |  |
Extended maturity period of secured third-party note payable |  |  | August 2012 |  |  |  |  |  |  |  |  |  |
Interest rate of notes payable |  | 4.99% | 4.99% | 4.99% |  | 7.69% |  | 7.69% | 4.99% | 4.625% | 4.875% |  |
Aggregate principal face amount of senior unsecured notes |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |
Proceeds from notes payable | 491,800,000 |  |  | 495,705,000 | 4,220,000 |  |  |  |  |  |  |  |
Notes payable, maturity date |  |  |  |  |  |  |  | 2011 | 2011 | June 2021 | June 2023 |  |
Discounted Notes Payable Face Amount |  |  |  | The 2021 Notes were offered to the public at 99.404% of their face amount with a yield to maturity of 4.70% and the 2023 Notes were offered to the public at 98.878% of their face amount with a yield to maturity of 5.00%. |  |  |  |  |  |  |  |  |
Write off of unamortized loan costs |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring |  |  |  | 29,800,000 |  |  |  |  |  |  |  |  |
Non cash charges related to dedesignation of interest rate swap |  |  |  | $ 29,800,000 |  |  |  |  |  |  |  |  |
Weighted average interest rate on floating rate debt |  | 1.10% | 1.10% | 1.10% | 1.30% |  |  |  |  |  |  |  |
Weighted average maturity of indebtedness (including unsecured line of credit) |  | 7.3 | 7.3 | 7.3 |  |  |  |  |  |  |  |  |

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- Definition Secured third party note payable to one of our fully-consolidated joint ventures, in which we hold a 25% ownership, which was originally scheduled to mature in August 2011 and was contractually extended to August 2012. + Details
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