Income (Loss) Per Limited Partner Unit Antidilutive Securities Excluded from Computations of Earnings Per Unit (Details)	3 Months Ended
	Mar. 31, 2013
Common unit options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	12,854
Phantom Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	267,820
Series A preferred units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,665,683