Related Party Transactions (Affiliates Earned Commissions and Billed for Reimbursements Pursuant to Operating Agreement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Related Party Transactions [Abstract]
Cost reimbursements to General Partner	$ 96	$ 43	$ 321	$ 138
Equipment and incentive management fees to General Partner	23	15	66	43
Related party transaction, total	$ 119	$ 58	$ 387	$ 181