Members' Capital (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Members Capital Account [Line Items]
Members capital account, Units issued	13,560,188	13,560,188
Members capital account, Units outstanding	13,560,188	13,560,188	13,560,188
Other Members capital account, Units authorized	15,000,000	15,000,000
Distributions declared	$ 4,068
Managing Member [Member]
Other Members Capital Account [Line Items]
Members capital account, Units issued	50	50