Statements of Changes in Partners' Capital (Parenthetical) (USD $)	12 Months Ended
Dec. 31, 2011
Distributions to Limited Partners, per Unit	$ 0.25

Per-share or per-unit cash distributions paid to a common shareholder or unit-holder by an LLC or LP.

No definition available.

Name:	us-gaap_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidPerUnit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration