Consolidated Statements of Partners' Capital (USD $) In Thousands, unless otherwise specified	Total	Accumulated other comprehensive loss	General partner	Class A limited partners
Balance at Jun. 30, 2012	$ 41,744	$ (317)	$ 81	$ 41,980
Allocation of net income (loss):
Allocation of net income (loss):	296			296
Other comprehensive income:
Change in pension and severance obligations	6	6
Balance at Sep. 30, 2012	42,046	(311)	81	42,276
Balance at Dec. 31, 2011	42,537	(329)	81	42,785
Allocation of net income (loss):
Allocation of net income (loss):	(509)			(509)
Other comprehensive income:
Change in pension and severance obligations	18	18
Balance at Sep. 30, 2012	42,046	(311)	81	42,276
Balance at Dec. 31, 2012	42,002	(365)	81	42,286
Allocation of net income (loss):
Allocation of net income (loss):	(2,996)			(2,996)
Cash distributions:
Cash distributions:	(150)			(150)
Other comprehensive income:
Change in pension and severance obligations	21	21
Balance at Sep. 30, 2013	38,877	(344)	81	39,140
Balance at Jun. 30, 2013	40,087	(351)	81	40,357
Allocation of net income (loss):
Allocation of net income (loss):	(1,217)			(1,217)
Other comprehensive income:
Change in pension and severance obligations	7	7
Balance at Sep. 30, 2013	$ 38,877	$ (344)	$ 81	$ 39,140