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Partners' Capital of the Operating Partnership (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017, respectively, are computed as follows (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Numerator
2018

2017
 
2018
 
2017
Basic Earnings:
 
 
 
 
 
 
 
Income attributable to SLGOP common unitholders
$
93,006

 
$
40,681

 
$
309,187

 
$
61,149

Less: distributed earnings allocated to participating securities
(125
)
 
(109
)
 
(371
)
 
(330
)
Less: undistributed earnings allocated to participating securities
(33
)
 
—

 
(138
)
 
—

Net Income attributable to SLGOP common unitholders (numerator for basic earnings per unit)
$
92,848

 
$
40,572

 
$
308,678

 
$
60,819

Add back: undistributed earnings allocated to participating securities
33

 
—

 
138

 
—

Add back: distributed earnings allocated to participating securities
125

 
109

 
371

 
330

Income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)
$
93,006

 
$
40,681

 
$
309,187

 
$
61,149

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Denominator
2018

2017
 
2018
 
2017
Basic units:
 
 
 
 
 
 
 
Weighted average common units outstanding
90,209

 
102,326

 
92,369

 
104,001

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Stock-based compensation plans
219

 
244

 
211

 
279

Diluted weighted average common units outstanding
90,428

 
102,570

 
92,580

 
104,280