Partners' Capital of the Operating Partnership (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Schedule of earnings per unit calculation

Earnings per Unit

	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2013		2012		2013		2012
Numerator
Basic Earnings:
Income attributable to SLGOP common unitholders	$	38,135	$	8,299	$	66,119	$	140,904
Effect of Dilutive Securities:
Stock options	—		—		—		—
Diluted Earnings:
Income attributable to SLGOP common unitholders	$	38,135	$	8,299	$	66,119	$	140,904

	Three Months Ended   September 30,		Nine Months Ended   September 30,
	2013	2012	2013	2012
Denominator
Basic Earnings:
Weighted average common units outstanding	94,780	93,561	94,389	92,117
Effect of Dilutive Securities:
3.00% exchangeable senior notes due 2017	—	—	—	—
3.00% exchangeable senior notes due 2027	—	—	—	—
4.00% exchangeable senior debentures due 2025	—	—	—	—
Stock-based compensation plans	236	330	242	368
Diluted weighted average common units outstanding	95,016	93,891	94,631	92,485