Summary Of Significant Accounting Policies (Summary Of Geographic Information Relating To Sources, By Nation, Of Partnership's Total Revenue and Long-Lived Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,275	$ 1,496
Percentage of total revenue	100.00%	100.00%
Long-lived assets	6,681	6,959	6,959
Percentage of long lived assets	100.00%	100.00%
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,243	1,445
Percentage of total revenue	97.00%	97.00%
Long-lived assets	6,657	6,935
Percentage of long lived assets	100.00%	100.00%
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	32	51
Percentage of total revenue	3.00%	3.00%
Long-lived assets	24	24
Percentage of long lived assets	0.00%	0.00%
Total International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	32	51
Percentage of total revenue	3.00%	3.00%
Long-lived assets	$ 24	$ 24
Percentage of long lived assets	0.00%	0.00%