Partners' Capital of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Schedule of calculation of numerator and denominator in earnings per unit

Earnings per unit for the years ended December 31, 2013, 2012 and 2011 is computed as follows (in thousands):

	December 31,
Numerator	2013		2012		2011
Basic Earnings:
Income attributable to SLGOP common unitholders	$	104,353	$	161,581	$	631,861
Effect of Dilutive Securities:
Stock options	—		—		—
Diluted Earnings:
Income attributable to SLGOP common unitholders	$	104,353	$	161,581	$	631,861

	December 31,
Denominator	2013	2012	2011
Basic units:
Weighted average common units outstanding	95,004	92,526	85,747
Effect of Dilutive Securities:
3.0% exchangeable senior debentures due 2017	—	—	—
3.0% exchangeable senior debentures due 2027	—	—	—
4.0% exchangeable senior debentures due 2025	—	—	—
Stock-based compensation plans	262	347	497
Diluted weighted average common units outstanding	95,266	92,873	86,244