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Consolidated Statements of Equity (USD $) In Thousands, unless otherwise specified | Total | Preferred Shares | Common Shares | Additional Paid-in Capital | Cumulative Distributions in Excess of Net Income | Accumulated Other Comprehensive Loss | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2008 | $ 1,082,423 | $ 81 | $ 518 | $ 1,112,734 | $ (162,572) | $ (4,749) | $ 136,411
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Conversion of common units to common shares (100,939, 663,498 and 2,841,394 shares in 2011, 2010 and 2009, respectively) |  |  | 28 | 61,627 |  |  | (61,655)
Common shares issued to the public (4,600,000, 7,475,000 and 2,990,000 shares in 2011, 2010 and 2009, respectively) | 71,825 |  | 30 | 71,795 |  |  |
Exercise of share options (191,264, 278,656 and 464,601 shares in 2011, 2010 and 2009, respectively) | 5,226 |  | 4 | 5,222 |  |  |
Share-based compensation | 10,602 |  | 3 | 10,599 |  |  |
Restricted common share redemptions (114,687, 105,215 and 79,343 shares in 2011, 2010 and 2009, respectively) | (2,049) |  |  | (2,049) |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT |  |  |  | (21,072) |  |  | 21,072
Adjustments related to derivatives designated as cash flow hedges | 3,427 |  |  |  |  | 2,842 | 585
Increase (Decrease) in tax benefit from share-based compensation | (152) |  |  | (152) |  |  |
Net (loss) income | 61,299 |  |  |  | 56,329 |  | 4,970
Dividends | (103,698) |  |  |  | (103,698) |  |
Distributions to owners of common and preferred units in the Operating Partnership | (8,622) |  |  |  |  |  | (8,622)
Contributions from noncontrolling interests in other consolidated entities | 786 |  |  |  |  |  | 786
Distributions to noncontrolling interests in other consolidated entities | (435) |  |  |  |  |  | (435)
Balance at Dec. 31, 2009 | 1,120,632 | 81 | 583 | 1,238,704 | (209,941) | (1,907) | 93,112
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Issuance of 4.25% Exchangeable Senior Notes | 18,149 |  |  | 18,149 |  |  |
Conversion of common units to common shares (100,939, 663,498 and 2,841,394 shares in 2011, 2010 and 2009, respectively) |  |  | 6 | 9,561 |  |  | (9,567)
Common shares issued to the public (4,600,000, 7,475,000 and 2,990,000 shares in 2011, 2010 and 2009, respectively) | 245,621 |  | 75 | 245,546 |  |  |
Exercise of share options (191,264, 278,656 and 464,601 shares in 2011, 2010 and 2009, respectively) | 4,575 |  | 3 | 4,572 |  |  |
Share-based compensation | 11,845 |  | 2 | 11,843 |  |  |
Restricted common share redemptions (114,687, 105,215 and 79,343 shares in 2011, 2010 and 2009, respectively) | (3,913) |  |  | (3,913) |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT |  |  |  | (10,274) |  |  | 10,274
Adjustments related to derivatives designated as cash flow hedges | (1,784) |  |  |  |  | (2,256) | 472
Net (loss) income | 45,504 |  |  |  | 42,760 |  | 2,744
Dividends | (114,613) |  |  |  | (114,613) |  |
Distributions to owners of common and preferred units in the Operating Partnership | (7,926) |  |  |  |  |  | (7,926)
Contributions from noncontrolling interests in other consolidated entities | 9,510 |  |  |  |  |  | 9,510
Acquisition of noncontrolling interests in other consolidated entities | (4,462) |  |  | (2,344) |  |  | (2,118)
Balance at Dec. 31, 2010 | 1,323,138 | 81 | 669 | 1,511,844 | (281,794) | (4,163) | 96,501
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |
Conversion of common units to common shares (100,939, 663,498 and 2,841,394 shares in 2011, 2010 and 2009, respectively) |  |  | 1 | 1,520 |  |  | (1,521)
Common shares issued to the public (4,600,000, 7,475,000 and 2,990,000 shares in 2011, 2010 and 2009, respectively) | 145,367 |  | 46 | 145,321 |  |  |
Exercise of share options (191,264, 278,656 and 464,601 shares in 2011, 2010 and 2009, respectively) | 2,461 |  | 2 | 2,459 |  |  |
Share-based compensation | 14,267 |  | 2 | 14,265 |  |  |
Restricted common share redemptions (114,687, 105,215 and 79,343 shares in 2011, 2010 and 2009, respectively) | (3,990) |  |  | (3,990) |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT |  |  |  | (2,798) |  |  | 2,798
Adjustments related to derivatives designated as cash flow hedges | 1,500 |  |  |  |  | 2,430 | (930)
Increase (Decrease) in tax benefit from share-based compensation | 47 |  |  | 47 |  |  |
Net (loss) income | (124,318) |  |  |  | (117,675) |  | (6,643)
Dividends | (132,819) |  |  |  | (132,819) |  |
Distributions to owners of common and preferred units in the Operating Partnership | (7,833) |  |  |  |  |  | (7,833)
Contributions from noncontrolling interests in other consolidated entities | 261 |  |  | (23) |  |  | 284
Distributions to noncontrolling interests in other consolidated entities | (16) |  |  |  |  |  | (16)
Balance at Dec. 31, 2011 | $ 1,218,065 | $ 81 | $ 720 | $ 1,668,645 | $ (532,288) | $ (1,733) | $ 82,640

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Period Type: | duration

X
- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 11A -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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration