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NET INCOME (LOSS) PER COMMON UNIT | 12 Months Ended
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Dec. 31, 2013
NET INCOME (LOSS) PER COMMON UNIT | 15. NET INCOME (LOSS) PER COMMON UNIT Basic and diluted net income (loss) per common unit for the years ended December 31, 2013, 2012 and 2011 was calculated as follows:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Net Income (Loss) Attributable to The Blackstone Group L.P. |  | $ | 1,171,202 |  |  | $ | 218,598 |  |  | $ | (168,303 | )
Basic Net Income (Loss) Per Common Unit |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Common Units Outstanding |  |  | 587,018,828 |  |  |  | 533,703,606 |  |  |  | 475,582,718 |
Basic Net Income (Loss) Per Common Unit |  | $ | 2.00 |  |  | $ | 0.41 |  |  | $ | (0.35 | )
Diluted Net Income (Loss) Per Common Unit |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Common Units Outstanding |  |  | 587,018,828 |  |  |  | 533,703,606 |  |  |  | 475,582,718 |
Weighted-Average Unvested Deferred Restricted Common Units |  |  | 3,527,812 |  |  |  | 4,965,464 |  |  |  | — |
Weighted-Average Diluted Common Units Outstanding |  |  | 590,546,640 |  |  |  | 538,669,070 |  |  |  | 475,582,718 |
Diluted Net Income (Loss) Per Common Unit |  | $ | 1.98 |  |  | $ | 0.41 |  |  | $ | (0.35 | )
The following table summarizes the anti-dilutive securities for the periods indicated:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Weighted-Average Unvested Deferred Restricted Common Units |  |  | — |  |  |  | — |  |  |  | 22,529,309 |
Weighted-Average Blackstone Holdings Partnership Units |  |  | 553,579,525 |  |  |  | 590,446,577 |  |  |  | 628,115,753 |
Unit Repurchase Program In January 2008, Blackstone announced that the Board of Directors of its general partner, Blackstone Group Management L.L.C., had authorized the repurchase by Blackstone of up to $500 million of Blackstone common units and Blackstone Holdings Partnership Units. Under this unit repurchase program, units may be repurchased from time to time in open market transactions, in privately negotiated transactions or otherwise. The timing and the actual number of Blackstone common units and Blackstone Holdings Partnership Units repurchased will depend on a variety of factors, including legal requirements, price and economic and market conditions. This unit repurchase program may be suspended or discontinued at any time and does not have a specified expiration date. During the years ended December 31, 2013 and 2012, no units were repurchased. As of December 31, 2013, the amount remaining available for repurchases under this program was $335.8 million. During the year ended December 31, 2011, Blackstone repurchased 116,270 vested Blackstone Holdings Partnership Units as part of the unit repurchase program for a total fair value of $2.1 million.

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