Partners' Capital (EPU) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Weighted Common units - Basic	14,313,999	3,998,209	13,888,057	3,556,675
Weighted Common units - Diluted	14,313,999	23,771,370	13,888,057	3,556,675
Restricted unvested common units granted and outstanding	385,042		385,042
Assumed net income (loss) to be allocated	$ (5,442)	$ 9,949	$ (31,754)	$ (17,997)
Assumed income to be allocated		$ 28,807
Basic earnings per unit	$ (0.38)	$ 2.49	$ (2.29)	$ (5.06)
Diluted earnings per unit	$ (0.38)	$ 1.21	$ (2.29)	$ (5.06)
Asset impairments			$ 4,688	$ 1,309
Common Units
Weighted Common units - Basic	14,313,999	3,998,209	13,888,057	3,556,675
Weighted Common units - Diluted	14,313,999	23,771,370	13,888,057	3,556,675
Assumed net income (loss) to be allocated	$ (5,442)	$ 9,949	$ (31,754)	$ (17,997)
Assumed income to be allocated		$ 28,807
Net loss per unit - Basic and diluted	$ (0.38)	$ 1.21	$ (2.29)	$ (5.06)
Basic earnings per unit		$ 2.49
Restricted Unvested Units
Assumed net income (loss) to be allocated			$ 0