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Notes Payable (Details) (USD $) | 12 Months Ended |  | 1 Months Ended |  |  |  | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Unsecured Debt [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.23% [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.34% [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.359% [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.49% [Member] | Dec. 31, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.053% [Member] | Sep. 30, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 3.950 % [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] | Dec. 31, 2012 Unsecured Debt [Member] 20 Year Unsecured Notes [Member] | May 02, 2012 Unsecured Debt [Member] 10 Year Unsecured Notes 5.05 % [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]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon stated rate |  | 3.875% |  |  | 5.125% |  | 5.25% |  | 5.35% |  | 5.35% |  | 4.95% |  |  | 3.95% |  | 3.95% | 7.25% |  |  | 5.05% | 5.05%
Effective rate |  |  |  |  | 5.227% | [1] | 5.339% | [1] | 5.359% | [1] | 5.49% | [1] | 5.053% | [1] |  | 4.018% | [1] |  | 7.36% | [1] |  |  |
Total principal | $ 346,519,000 |  |  | $ 910,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unamortized discount |  |  |  | (3,810,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 906,190,000 | 657,470,000 |  | 910,000,000 | 60,000,000 |  | 100,000,000 |  | 50,000,000 |  | 100,000,000 |  | 250,000,000 |  |  | 300,000,000 |  |  | 50,000,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |
Debt Instrument, Issuance Price, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.438% |  |  |  |  |
Proceeds from notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 296,400,000 |  |  |  |  |  |  |  |
Repayments of unsecured debt | $ 50,000,000 | $ 96,521,000 | $ 193,799,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
[1] | Yield on issuance date, including the effects of discounts on the notes.

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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