Condensed Consolidated Statements of Changes in Partners’ Capital - USD ($) $ in Thousands	Class A Preferred Units	Common Units	Total
Partner's Capital (Deficit) at Dec. 31, 2015	$ 17,112	$ (45,285)	$ (28,173)
Partner's Capital (Deficit) (in shares) at Dec. 31, 2015	11,694,364	3,240,813
Units tendered by employees for tax withholding		$ (140)	(140)
Units tendered by employees for tax withholding (in shares)		(12,227)
Units forfeited by employees (in shares)		(2,000)
Unit-based compensation programs		$ 2,044	2,044
Unit-based compensation programs (in shares)		67,627
Issuance of common units, net of offering costs		$ 96,278	96,278
Issuance of common units, net of offering costs (in shares)		9,226,595
Class A Preferred Units converted to common units	$ (17,112)	$ 17,112
Class A Preferred Units converted to common units (in shares)	(11,694,364)	1,169,441
Common units retired via unit repurchase program		$ (2,948)	(2,948)
Common units retired via unit repurchase program (in shares)		(242,500)
Cash distributions to common unit holders		$ (6,696)	(6,696)
Distributions - Class B preferred units		(62,852)	(62,852)
Net income (loss)		19,231	19,231
Partner's Capital (Deficit) at Dec. 31, 2016		$ 16,744	16,744
Partner's Capital (Deficit) (in shares) at Dec. 31, 2016		13,447,749
Unit-based compensation programs		$ 2,648	2,648
Unit-based compensation programs (in shares)		212,481
Issuance of common units, net of offering costs		$ 9,124	9,124
Issuance of common units, net of offering costs (in shares)		719,671
Cash distributions to common unit holders		$ (18,530)	(18,530)
Common units issued as Class B Preferred distributions		$ 5,250	5,250
Common units issued as Class B Preferred distributions (in shares)		393,291
Distributions - Class B preferred units		$ (28,425)	(28,425)
Net income (loss)		(3,329)	(3,329)
Partner's Capital (Deficit) at Sep. 30, 2017		$ (16,518)	$ (16,518)
Partner's Capital (Deficit) (in shares) at Sep. 30, 2017		14,773,192