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Unsecured Lines Of Credit Payable - Narrative (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Credit Facility No. 1 [Member] | Dec. 31, 2012 Credit Facility No. 1 [Member] London Interbank Offered Rate (LIBOR) [Member] | Dec. 31, 2012 Credit Facility No. 1 [Member] Maximum [Member] | Dec. 31, 2012 Credit Facility No. 2 [Member] | Dec. 31, 2012 Credit Facility No. 2 [Member] London Interbank Offered Rate (LIBOR) [Member] | Dec. 31, 2012 Credit Facility No. 2 [Member] Maximum [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.05 % [Member] | Apr. 30, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.05 % [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 3.950 % [Member] | Sep. 30, 2010 Unsecured Debt [Member] 10 Year Unsecured Notes 3.950 % [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Committed capacity | $ 500,000,000 | $ 475,000,000 | $ 337,000,000 | $ 100,000,000 |  | $ 200,000,000 | $ 400,000,000 |  | $ 600,000,000 |  |  |  |
Stated interest rate |  | 3.875% |  |  |  |  |  |  |  | 5.05% | 5.05% | 3.95% | 3.95%
Expiration date |  |  |  | Jun. 30, 2015 |  |  | Jul. 31, 2016 |  |  |  |  |  |
Spread on variable rate |  |  |  |  | 1.20% |  |  | 1.20% |  |  |  |  |
Extension term | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Facility fee | 0.25% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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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- Definition Line Of Credit Extension Term + References No definition available. + Details
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