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Consolidated Statements of Changes in Partners' Capital (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Limited Partners Common
Distributions declared and paid	$ 0.32	$ 0.46	$ 0.94
Limited Partners Preferred
Distributions declared and paid	$ 0.86	$ 0.86	$ 0.87

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- Definition

Refers to the amount of distribution per-unit, declared and paid to limited, class B preferred, general partners and other class of interests.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
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- Details

Name:	us-gaap_PartnerCapitalComponentsAxis=us-gaap_LimitedPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_PartnerCapitalComponentsAxis=us-gaap_PreferredPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: