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Rental and Other Revenues; Rental Property and Other Expenses (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Real Estate Revenue, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual rents, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 420,285 | $ 398,224 | $ 392,360
Straight-line rental income, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,828 | 11,349 | 3,644
Amortization of lease incentives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,371) | (1,239) | (1,100)
Property operating expense recoveries, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,105 | 41,736 | 44,462
Lease termination fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,443 | 2,992 | 1,813
Fee income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,571 | 5,466 | 5,155
Other miscellaneous operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,991 | 2,598 | 1,684
Real estate revenue, net | 128,730 | [1] | 122,086 | [1] | 117,057 | [1] | 114,979 | [1] | 117,330 | [1] | 115,528 | [1] | 113,765 | [1] | 114,503 | [1] | 482,852 | 461,126 | 448,018
Future minimum base rents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future minimum base rents, current | 448,420 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 448,420 |  |
Future minimum base rents, year two | 409,453 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 409,453 |  |
Future minimum base rents, year three | 352,743 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,743 |  |
Future minimum base rents, year four | 297,859 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 297,859 |  |
Future minimum base rents, year five | 247,283 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 247,283 |  |
Future minimum base rents, thereafter | 809,042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 809,042 |  |
Total future minimum base rents | 2,564,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,564,800 |  |
Operating Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities, insurance and real estate taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,156 | 90,838 | 91,173
Maintenance, cleaning and general building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,700 | 56,877 | 55,840
Property management and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,624 | 11,203 | 11,702
Other miscellaneous operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,668 | 4,720 | 3,310
Rental property and other expenses, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 176,148 | $ 163,638 | $ 162,025
[1] | The amounts presented may not equal to the amounts previously reported in the most recent Form 10-Qs or prior 10-K for each period as a result of discontinued operations.

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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 19 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453417&loc=d3e39896-112707 + Details
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- Definition The aggregate costs related to management of owned properties during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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