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Earnings (Loss) Per Common Share/Unit | 12 Months Ended
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Dec. 31, 2011
Earnings (Loss) Per Common Share/Unit [Abstract] |
Earnings (Loss) Per Common Share Unit |
18. | Earnings (Loss) Per Common Share / Unit
We determine basic earnings per share/unit based on the weighted average number of shares of common stock/units outstanding during the period. We compute diluted earnings per share/unit based on the weighted average number of shares of common stock/units outstanding combined with the incremental weighted average effect from all outstanding potentially dilutive instruments. The following table sets forth the computation of our basic and diluted earnings per share/unit for the years ended December 31 (in thousands, except per share/unit amounts):
REIT |  | 2011 (1) |  |  | 2010 (1)(2) |  |  | 2009 (1)(2) |
Net loss attributable to common shares |  | $ | (188,110) |  |  | $ | (1,295,920) |  |  | $ | (2,650) |
Weighted average common shares outstanding - Basic and Diluted (3) |  |  | 370,534 |  |  |  | 219,515 |  |  |  | 179,966 |
Net loss per share attributable to common shares - Basic and Diluted |  | $ | (0.51) |  |  | $ | (5.90) |  |  | $ | (0.01) |
Operating Partnership |  |  |  |
Net loss attributable to common unitholders |  | $ | (188,459) |  |  | $ | (1,295,920) |  |  | $ | (2,650) |
Weighted average common partnership units outstanding - Basic and Diluted (3) |  |  | 371,730 |  |  |  | 219,515 |  |  |  | 179,966 |
Net loss per unit attributable to common unitholders - Basic and Diluted |  | $ | (0.51) |  |  | $ | (5.90) |  |  | $ | (0.01) |
(1) | In periods with a net loss, the inclusion of any incremental shares is anti-dilutive, and therefore, both basic and diluted shares/units are the same.
(2) | As a result of the Merger, the historical shares of ProLogis were adjusted by the Merger exchange ratio of 0.4464 for all periods presented. As a result, the per share/unit calculations and shares/units outstanding were also adjusted.
(3) | Total weighted average potentially dilutive share awards outstanding (in thousands) for the years ended December 31, 2011, 2010 and 2009 were 7,648, 4,498 and 5,151, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -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 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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