Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 73,225	$ 64,641	$ 234,864	$ 183,113
Revenues—related party	5,124	1,435	10,346	9,182
Total Revenue	78,349	66,076	245,210	192,295
Cost of goods sold (exclusive of depreciation)	46,062	45,175	130,738	119,514
Cost of goods sold (exclusive of depreciation)—related party	3,538	3,075	13,831	13,329
Total Cost of goods sold (exclusive of depreciation)	49,600	48,250	144,569	132,843
Selling, general and administrative expenses	2,822	2,389	9,540	12,628
Selling, general and administrative expenses—related party	852	1,058	2,591	3,720
Total Selling, general and administrative expenses	3,674	3,447	12,131	16,348
Depreciation expense	15,269	15,253	45,796	46,144
Income (loss) from operations before interest expense, other income and income tax expense	9,806	(874)	42,714	(3,040)
Interest expense	5,782	10,104	17,054	28,869
Interest expense—related party	4,265	143	13,006	245
Loss on disposition of fixed assets	(167)	(4)	(167)	(451)
Other expense	(13)	(16)	(31)	(5)
Income (loss) from operations before tax expense	(421)	(11,141)	12,456	(32,610)
Income tax expense	102	556	661	589
Net income (loss)	$ (523)	$ (11,697)	$ 11,795	$ (33,199)
Earnings (loss) per limited partner unit:
Common unit (basic and diluted) (in USD per share)	$ (0.01)	$ (0.13)	$ 0.14	$ (0.38)
Weighted average number of limited partner units outstanding:
Common units (basic and diluted) (in shares)	86,997,590	86,997,590	86,997,590	86,997,590