Income (Loss) Per Limited Partner Unit

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Income (Loss) Per Limited Partner Unit

Income per Common Unit

The following tables provide a reconciliation of the numerator and denominator of the basic and diluted earnings per common unit computations for the three and six months endedJune 30, 2013 and 2012:

	Three Months Ended June 30,
	2013					2012
	Income (Numerator)		Units (Denominator)	Per-Unit Amount		Income (Numerator)			Units (Denominator)	Per-Unit Amount
Basic income per unit
Amounts allocated to common units	$	13	193,065,183	$	0.07	$	23		170,107,060	$	0.14
Effect of Dilutive Securities:
Common unit options	—		24,365			—			8,474
Phantom units *	—		331,462			—			288,644
Series A Preferred Units	—		—			(6		)	4,645,229
Diluted income per unit	$	13	193,421,010	$	0.07	$	17		175,049,407	$	0.10

	Six Months Ended June 30,
	2013					2012
	Income (Numerator)		Units (Denominator)	Per-Unit Amount		Income (Numerator)			Units (Denominator)	Per-Unit Amount
Basic income per unit
Amounts allocated to common units	$	4	182,070,077	$	0.02	$	47		164,398,548	$	0.29
Effect of Dilutive Securities:
Common unit options	—		19,035			—			15,033
Phantom units *	—		303,218			—			325,129
Series A Preferred Units	—		—			(3		)	4,645,229
Diluted income per unit	$	4	182,392,330	$	0.02	$	44		169,383,939	$	0.26

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* Amount assumes maximum conversion rate for market condition awards.

The following data show securities that could potentially dilute earnings per unit in the future that were not included in the computation of diluted earnings per unit because to do so would have been antidilutive for the periods presented:

	Three Months Ended June 30, 2013	Six Months Ended June 30, 2013
Series A Preferred Units	4,672,835	4,672,835