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Partners' Capital of the Operating Partnership (Tables)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Schedule of calculation of numerator and denominator in earnings per unit
The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2019 and 2018, respectively, are computed as follows (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Numerator
2019

2018
 
2019
 
2018
Basic Earnings:
 
 
 
 
 
 
 
Income attributable to SLGOP common unitholders
$
34,876

 
$
93,006

 
$
250,358

 
$
309,187

Less: distributed earnings allocated to participating securities
(108
)
 
(125
)
 
(325
)
 
(371
)
Less: undistributed earnings allocated to participating securities
—

 
(33
)
 
(41
)
 
(138
)
Net Income attributable to SLGOP common unitholders (numerator for basic earnings per unit)
$
34,768

 
$
92,848

 
$
249,992

 
$
308,678

Add back: distributed earnings allocated to participating securities
108

 
125

 
325

 
371

Add back: undistributed earnings allocated to participating securities
—

 
33

 
41

 
138

Income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)
$
34,876

 
$
93,006

 
$
250,358

 
$
309,187

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Denominator
2019

2018
 
2019
 
2018
Basic units:
 
 
 
 
 
 
 
Weighted average common units outstanding
86,550

 
90,209

 
87,138

 
92,369

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Stock-based compensation plans
164

 
219

 
171

 
211

Diluted weighted average common units outstanding
86,714

 
90,428

 
87,309

 
92,580