Partners' Capital of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014, 2013 and 2012 are computed as follows (in thousands):

	Year Ended December 31,
Numerator	2014		2013		2012
Basic and Diluted Earnings:
Income attributable to SLGOP common unitholders	$	521,571	$	104,353	$	161,581

	Year Ended December 31,
Denominator	2014	2013	2012
Basic units:
Weighted average common units outstanding	99,288	95,004	92,526
Effect of Dilutive Securities:
Stock-based compensation plans	408	262	347
Diluted weighted average common units outstanding	99,696	95,266	92,873