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Partners' Capital of the Operating Partnership (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Unit
The Operating Partnership's earnings per unit for the years ended December 31, 2021, 2020, and 2019 respectively are computed as follows (in thousands):
Year Ended December 31,
Numerator202120202019
Basic Earnings:
Net income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)$460,261 $376,121 $268,785 
Less: distributed earnings allocated to participating securities
(2,398)(1,685)(1,700)
Less: undistributed earnings allocated to participating securities
(192)(137)— 
Net Income attributable to SLGOP common unitholders (numerator for basic earnings per unit)$457,671 $374,299 $267,085 
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares2,590 1,822 1,700 
Income attributable to SLGOP common unitholders$460,261 $376,121 $268,785 
Year Ended December 31,
Denominator202120202019
Basic units:
Weighted average common units outstanding69,667 74,493 81,332 
Effect of Dilutive Securities:
Stock-based compensation plans765 441 543 
Contingently issuable units337 144 (10)
Diluted weighted average common units outstanding70,769 75,078 81,865