Partners' Capital (Narrative) (Details)	6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Other Members Capital Account [Line Items]
Limited Partners' capital account, units issued	14,985,550	14,985,550	14,985,550
Limited Partners' capital account, units outstanding	14,985,550	14,985,550	14,985,550
Limited Partners' capital account, units authorized		15,000,000	15,000,000
Partnership right to repurchase Units of a Unitholder	100.00%
Percentage of cash distributions from operations as incentive management fee	4.00%
Initial Limited Partners [Member]
Other Members Capital Account [Line Items]
Limited Partners' capital account, units issued		50	50
Limited Partner [Member]
Other Members Capital Account [Line Items]
Allocation of net income, net losses, and distributions	92.50%
General Partner [Member]
Other Members Capital Account [Line Items]
Allocation of net income, net losses, and distributions	7.50%
First [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from sales or refinancing as annual return on invested capital	10.00%
First [Member] | Limited Partner [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from operations	88.50%
Percentage of cash distribution from sales or refinancing	92.50%
First [Member] | General Partner [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from operations	7.50%
Percentage of cash distribution from sales or refinancing	7.50%
First [Member] | Affiliated Entity [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from operations	4.00%
Thereafter [Member] | Limited Partner [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from sales or refinancing as annual return on invested capital	10.00%
Second [Member] | Limited Partner [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from operations	85.00%
Percentage of cash distribution from sales or refinancing	85.00%
Second [Member] | General Partner [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from operations as incentive management fee	7.50%
Percentage of cash distribution from sales or refinancing	7.50%
Second [Member] | Affiliated Entity [Member]
Other Members Capital Account [Line Items]
Percentage of cash distributions from operations as incentive management fee	7.50%
Percentage of cash distribution from sales or refinancing	7.50%