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Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Kilroy Realty, L.P. [Member])
 12 Months Ended
Dec. 31, 2012
Kilroy Realty, L.P. [Member]
  
Net Income Available To Common Unitholders [Line Items]  
Net Income Available to Common Unitholders per Unit of the Operating Partnership
Net Income Available to Common Unitholders Per Unit of the Operating Partnership
The following table reconciles the numerator and denominator in computing the Operating Partnership's basic and diluted per-unit computations for net income available to common unitholders for the years ended December 31, 2012, 2011, and 2010:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in thousands, except unit and per unit amounts)
Numerator:
 
 
 
 
 
Income (loss) from continuing operations
$
5,447

 
$
(3,728
)
 
$
(427
)
Income from continuing operations attributable to noncontrolling interests in consolidated subsidiaries
(174
)
 
(529
)
 
(162
)
Preferred distributions
(21,088
)
 
(15,196
)
 
(15,196
)
Allocation to participating securities (nonvested units and time-based RSUs)
(1,602
)
 
(1,309
)
 
(1,151
)
Numerator for basic and diluted loss from continuing operations available to common unitholders
(17,417
)
 
(20,762
)
 
(16,936
)
Income from discontinued operations
271,654

 
71,217

 
20,313

Income from discontinued operations attributable to noncontrolling interests in consolidated subsidiaries
(464
)
 
—

 
—

Numerator for basic and diluted net income available to common unitholders
$
253,773

 
$
50,455

 
$
3,377

Denominator:
 
 
 
 
 
Basic weighted average vested units outstanding
71,403,258

 
58,437,444

 
51,220,618

Effect of dilutive securities-contingently issuable shares and stock options
—

 
—

 
—

Diluted weighted average vested units and common unit equivalents outstanding
71,403,258

 
58,437,444

 
51,220,618

Basic earnings per unit:
 
 
 
 
 
Loss from continuing operations available to common unitholders per unit
$
(0.24
)
 
$
(0.36
)
 
$
(0.33
)
Income from discontinued operations per common unit
3.80

 
1.22

 
0.40

Net income available to common unitholders per unit
$
3.56

 
$
0.86

 
$
0.07

Diluted earnings per unit:
 
 
 
 
 
Loss from continuing operations available to common unitholders per unit
$
(0.24
)
 
$
(0.36
)
 
$
(0.33
)
Income from discontinued operations per common unit
3.80

 
1.22

 
0.40

Net income available to common unitholders per unit
$
3.56

 
$
0.86

 
$
0.07


The impact of the contingently issuable units, which consist of the 88,490 market measure-based RSUs, the Exchangeable Notes, and the 1,540,000 stock options, were not considered in our diluted earnings per unit calculation for the year ended December 31, 2012 because the Operating Partnership reported a loss from continuing operations attributable to common unitholders and the effect was anti-dilutive. The impact of stock options and the Exchangeable Notes during the years ended December 31, 2011 and 2010, were not considered in our diluted earnings per unit calculation for the years ended December 31, 2011 and 2010 because we reported a loss from continuing operations attributable to common unitholders and the effect was anti-dilutive. See Note 7 for additional information regarding the Exchangeable Notes and Note 12 for additional information regarding the outstanding stock options and market measure-based RSUs.