Unit Based Awards (Schedule of Compensation Costs) (Details) - Selling, General and Administrative Expenses - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unit-based compensation expense	$ 330	$ 201	$ 1,080	$ 589
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unit-based compensation expense	333	145	985	429
Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unit-based compensation expense	$ (3)	$ 56	$ 95	$ 160