Condensed Consolidated Statements of Partners' Capital (Unaudited) - USD ($) $ in Thousands	General Partner [Member]	Limited Partner [Member]	AOCI Attributable to Parent [Member]	Total
Partners' capital at Dec. 31, 2014	$ 41,234		$ (186)	$ 41,048
Partners’ capital at beginning of period:
Class A limited partners		$ (658)		(658)
Change in pension and severance obligations			2	2
Partners' capital at Mar. 31, 2015	40,576		(184)	40,392
Partners' capital at Dec. 31, 2015	39,042		(321)	38,721
Partners’ capital at beginning of period:
Class A limited partners		$ (629)		(629)
Change in pension and severance obligations			2	2
Partners' capital at Mar. 31, 2016	$ 38,413		$ (319)	$ 38,094

Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration