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Earnings Per Common Share - Computation Of Basic And Diluted Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.875% |  |  |  |  |  |  |  |  | 3.875% |
Income (loss) from continuing operations | $ 1,248 | [1],[2] | $ 5,323 | [1],[2] | $ 5,694 | [1],[2] | $ 4,834 | [1],[2] | $ (10,844) | [1],[2],[3] | $ 2,275 | [1],[2] | $ 3,963 | [1],[2] | $ 1,708 | [1],[2] | $ 17,099 | $ (2,898) | $ (609)
Allocation of undistributed earnings to unvested restricted share awards and units to continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (451) | 0 | 0
Adjusted income (loss) from continuing operations attributable to the controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,648 | (2,898) | (609)
Income from discontinued operations, including gain on sale of real estate, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,609 | 108,276 | 38,168
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (494) | (133)
Allocation of undistributed earnings to unvested restricted share awards and units to discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (131) | (712) | (144)
Adjusted income from discontinued operations attributable to the controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,478 | 107,070 | 37,891
Adjusted net income attributable to the controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,126 | $ 104,172 | $ 37,282
Weighted average shares outstanding – basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,239 | 65,982 | 62,140
Employee stock options and restricted share awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137 | 0 | 0
Weighted average shares outstanding - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,376 | 65,982 | 62,140
Continuing operations - basic (in dollars per share) | $ 0.02 | [1],[2] | $ 0.08 | [1],[2] | $ 0.08 | [1],[2] | $ 0.07 | [1],[2] | $ (0.16) | [1],[2] | $ 0.03 | [1],[2] | $ 0.08 | [1],[2] | $ 0.03 | [1],[2] | $ 0.25 | $ (0.04) | $ (0.01)
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 | $ 1.62 | $ 0.61
Basic earnings: Adjusted net income attributable to the controlling interests - Per Share Amount | $ 0.04 | [1],[2] | $ 0.14 | [1],[2] | $ 0.09 | [1],[2] | $ 0.08 | [1],[2] | $ 0.46 | [1],[2] | $ 0.95 | [1],[2] | $ 0.10 | [1],[2] | $ 0.07 | [1],[2] | $ 0.35 | $ 1.58 | $ 0.60
Continuing operations - diluted (in dollars per share) | $ 0.02 | [1],[2] | $ 0.08 | [1],[2] | $ 0.08 | [1],[2] | $ 0.07 | [1],[2] | $ (0.16) | [1],[2] | $ 0.03 | [1],[2] | $ 0.08 | [1],[2] | $ 0.03 | [1],[2] | $ 0.25 | $ (0.04) | $ (0.01)
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 | $ 1.62 | $ 0.61
Net income attributable to the controlling interests per share, diluted | $ 0.04 | [1],[2] | $ 0.14 | [1],[2] | $ 0.09 | [1],[2] | $ 0.08 | [1],[2] | $ 0.46 | [1],[2] | $ 0.95 | [1],[2] | $ 0.10 | [1],[2] | $ 0.07 | [1],[2] | $ 0.35 | $ 1.58 | $ 0.60
[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 Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 -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 AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a -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 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) -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 average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -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 Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -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 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -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 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any. Adjusted for allocation of undistributed earnings to participating securities. + References No definition available. + Details
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