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Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, 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
Share Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  | $ 22,546 |  | $ 8,242 |  | $ (75,201)
Amount allocated to participating securities |  |  |  |  |  |  |  |  |  |  |  | (551) |  | (265) |  | 637
Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities |  |  |  |  |  |  |  |  |  |  |  | 21,995 |  | 7,977 |  | (74,564)
Income from discontinued operations, including gain on sale, attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  | 26,833 |  | 14,974 |  | 24,401
Net income (loss) attributable to common shareholders, as adjusted |  |  |  |  |  |  |  |  |  |  |  | 48,828 |  | 22,951 |  | (50,163)
Income (loss) from continuing operations attributable to common shareholders, as adjusted - per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.30 |  | $ 0.11 |  | $ (1.19)
Income from discontinued operations, including gain on sale, attributable to common shareholders - per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.37 |  | $ 0.22 |  | $ 0.39
Net income (loss) attributable to common shareholders, as adjusted - per share | $ 0.63 | [1] | $ 0.16 | $ (0.23) | [2] | $ 0.10 | $ 0.24 | [3] | $ 0.02 | $ 0.03 | $ 0.03 | $ 0.67 | [4] | $ 0.33 | [4] | $ (0.80)
Weighted average number of common shares outstanding - basic |  |  |  |  |  |  |  |  |  |  |  | 72,756,000 |  | 68,608,000 |  | 62,359,000
Income allocated to common units |  |  |  |  |  |  |  |  |  |  |  | $ 45 |  |  |  |
Income (loss) from continuing operations attibutable to shareholders, as adjusted |  |  |  |  |  |  |  |  |  |  |  | 22,040 |  | 7,977 |  | (74,564)
Net income (loss) attributable to common shareholders, as adjusted |  |  |  |  |  |  |  |  |  |  |  | $ 48,873 |  | $ 22,951 |  | $ (50,163)
Income (loss) from continuing operations attributable to common shareholders, as adjusted - per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.30 |  | $ 0.11 |  | $ (1.19)
Income from discontinued operations, including gain on sale, attributable to common shareholders - per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.36 |  | $ 0.22 |  | $ 0.39
Net income (loss) attributable to common shareholders, as adjusted - per share | $ 0.62 | [1] | $ 0.16 | $ (0.23) | [2] | $ 0.10 | $ 0.24 | [3] | $ 0.02 | $ 0.03 | $ 0.03 | $ 0.66 | [4] | $ 0.33 | [4] | $ (0.80)
Common share options and share awards granted |  |  |  |  |  |  |  |  |  |  |  | 706,000 |  | 349,000 |  |
Common units |  |  |  |  |  |  |  |  |  |  |  | 239,000 |  |  |  |
Weighted average number of common shares outstanding - diluted |  |  |  |  |  |  |  |  |  |  |  | 73,701,000 |  | 68,957,000 |  | 62,359,000
Number of common share equivalent securities excluded from the diluted earnings per share calculation |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  | 4,800,000 |  | 4,900,000
[1] | Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.
[2] | Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.
[3] | Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued operations.
[4] | Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -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 Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 -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 Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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