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Mortgages and Notes Payable (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Revolving Credit Facility due 2015 [Member] | Jul. 18, 2013 Revolving Credit Facility due 2015 [Member] | Mar. 31, 2013 Variable Rate Term Loan due 2016 [Member] | Jun. 30, 2013 Secured indebtedness [Member] | Dec. 31, 2012 Secured indebtedness [Member] | Jun. 30, 2013 Unsecured indebtedness [Member] | Dec. 31, 2012 Unsecured indebtedness [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgages and notes payable | $ 1,931,655,000 |  | $ 1,931,655,000 |  | $ 1,859,162,000 |  |  |  | $ 544,510,000 | $ 549,607,000 | $ 1,387,145,000 | $ 1,309,555,000
Aggregate undepreciated book value of secured real estate assets |  |  |  |  |  |  |  |  | 964,800,000 |  |  |
Maximum borrowing capacity on revolving credit facility |  |  |  |  |  | 475,000,000 |  |  |  |  |  |
Maturity date on revolving credit facility |  |  |  |  |  | Jul. 27, 2015 |  |  |  |  |  |
Additional borrowing capacity on revolving credit facility |  |  |  |  |  | 75,000,000 |  |  |  |  |  |
Amount outstanding on revolving credit facility |  |  |  |  |  | 135,400,000 | 113,000,000 |  |  |  |  |
Outstanding letters of credit on revolving credit facility |  |  |  |  |  | 100,000 | 100,000 |  |  |  |  |
Unused borrowing capacity on revolving credit facility |  |  |  |  |  | 339,500,000 | 361,900,000 |  |  |  |  |
Early repayment of debt |  |  |  |  |  |  |  | 35,000,000 |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  | Feb. 28, 2016 |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  | 200,000,000 |  |  |  |
Loss on extinguishment of debt | $ 0 | $ (973,000) | $ (164,000) | $ (973,000) |  |  |  | $ (200,000) |  |  |  |

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- Definition The undepreciated book value of real estate assets that are used to secure certain mortgages and notes payable. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: 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 Reference 3: 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. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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. + 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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