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Unsecured Debt (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Summary of short-term bank borrowings under unsecured commercial bank credit facility |  |  |  |
Total revolving credit facility | $ 932,800 |  |  |
Borrowings outstanding at end of period | 800,000 |  |  |
Unsecured Commercial Bank Credit Facility [Member] |  |  |  |
Summary of short-term bank borrowings under unsecured commercial bank credit facility |  |  |  |
Total revolving credit facility | 900,000 |  | 900,000 |
Borrowings outstanding at end of period | 0 | [1] | 421,000 | [1]
Weighted average daily borrowings during the period ended | 319,923 |  | 227,498 |
Maximum daily borrowings during the period ended | $ 788,000 |  | $ 450,000 |
Weighted average interest rate during the period ended | 1.50% |  | 1.00% |
Interest rate at the end of the period |  |  | 1.50% |
[1] | Excludes $4.1 million of letters of credit at June 30, 2012.

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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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