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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 segment | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Real estate rental revenue | $ 77,071 | [1],[2] | $ 77,108 | [1],[2] | $ 75,590 | [1],[2] | $ 75,214 | [1],[2] | $ 75,413 | [1],[2] | $ 70,550 | [1],[2] | $ 70,321 | [1],[2] | $ 67,872 | [1],[2] | $ 304,983 | $ 284,156 | $ 253,127
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,276 | 95,342 | 84,745
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 201,707 | 188,814 | 168,382
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (103,067) | (91,805) | (78,483)
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,488) | (15,728) | (14,406)
Real estate impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,097) | (14,526) | 0
Acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (234) | (3,607) | (1,161)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (64,697) | (66,214) | (66,965)
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 975 | 1,144 | 1,193
Loss on extinguishment of debt, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (976) | (9,176)
Gain from non-disposal activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 7
Income from properties sold or held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,485 | 11,923 | 16,569
Gain on sale of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,124 | 97,491 | 21,599
Income tax benefit (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (1,138) | 0
Net income | 2,958 | [1],[2],[3] | 9,561 | [1],[2] | 6,008 | [1],[2] | 5,181 | [1],[2] | 31,098 | [1],[2] | 63,036 | [1],[2] | 6,556 | [1],[2] | 4,688 | [1],[2] | 23,708 | 105,378 | 37,559
Less: Net income attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (494) | (133)
Net income attributable to the controlling interests | 2,958 | [1],[2] | 9,561 | [1],[2] | 6,008 | [1],[2] | 5,181 | [1],[2] | 30,689 | [1],[2] | 63,008 | [1],[2] | 6,522 | [1],[2] | 4,665 | [1],[2] | 23,708 | 104,884 | 37,426
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,735 | 33,436 | 25,437
Total assets | 2,124,376 |  |  |  |  |  |  |  | 2,120,758 |  |  |  |  |  |  |  | 2,124,376 | 2,120,758 | 2,167,881
Office [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue as a percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50 | 0.49 | 0.47
Percentage of total income producing real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.53 | 0.52 |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152,916 | 138,325 | 119,359
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,113 | 47,289 | 40,676
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,803 | 91,036 | 78,683
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,330 | 21,065 | 13,983
Total assets | 1,140,046 |  |  |  |  |  |  |  | 1,118,074 |  |  |  |  |  |  |  | 1,140,046 | 1,118,074 | 938,638
Medical Office [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue as a percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15 | 0.15 | 0.18
Percentage of total income producing real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.16 | 0.17 |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,674 | 44,431 | 44,166
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,994 | 14,063 | 14,516
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,680 | 30,368 | 29,650
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,004 | 5,654 | 4,986
Total assets | 327,573 |  |  |  |  |  |  |  | 347,735 |  |  |  |  |  |  |  | 327,573 | 347,735 | 353,508
Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue as a percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.18 | 0.18 | 0.16
Percentage of total income producing real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.17 | 0.17 |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,506 | 50,421 | 41,003
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,702 | 14,273 | 10,310
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,804 | 36,148 | 30,693
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,977 | 2,922 | 1,982
Total assets | 355,585 |  |  |  |  |  |  |  | 365,164 |  |  |  |  |  |  |  | 355,585 | 365,164 | 313,003
Multifamily [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue as a percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.17 | 0.18 | 0.19
Percentage of total income producing real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.14 | 0.14 |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,887 | 50,979 | 48,599
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,467 | 19,717 | 19,243
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,420 | 31,262 | 29,356
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,869 | 2,823 | 2,387
Total assets | 249,503 |  |  |  |  |  |  |  | 247,170 |  |  |  |  |  |  |  | 249,503 | 247,170 | 228,769
Industrial/Flex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 351 | 1,707
Total assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 225,206
Corporate And Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Real estate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 555 | 621 | 392
Total assets | $ 51,669 |  |  |  |  |  |  |  | $ 42,615 |  |  |  |  |  |  |  | $ 51,669 | $ 42,615 | $ 108,757
[1] | With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.
[2] | The prior quarter results have been restated to conform to the current quarter presentation. Specifically, results related to properties sold or held for sale have been reclassified into discontinued operations.
[3] | The three months ended December 31, 2012 and 2011 include the impact of real estate impairments of $2.1 million and $14.5 million, respectively.

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -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. + Details
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- Definition This element represents the total of the costs related to real estate revenues, including management, leasing, and development services. + 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(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -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 The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -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. + Details
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