Members' Capital (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Members Capital Account [Line Items]
Other Members capital account, units issued	13,560,188	13,560,188
Weighted average number of Units outstanding	13,560,188	13,560,188
Other Members capital account, units authorized	15,000,000	15,000,000
Potential repurchase price of Units as a percentage of holder's capital account	100.00%
Initial [Member]
Other Members Capital Account [Line Items]
Other Members capital account, units issued	50	50
Other Members [Member]
Other Members Capital Account [Line Items]
Weighted average number of Units outstanding	13,560,188	13,560,188	13,560,188
Allocation of net income, net losses and distribution allocation percentage	92.50%
Managing Member [Member]
Other Members Capital Account [Line Items]
Allocation of net income, net losses and distribution allocation percentage	7.50%