Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Third-party customers	$ 92,342	$ 70,497	$ 45,676
Related parties	13,039	11,292	9,230
Revenues	105,381	81,789	54,906
Operating expenses:
Operating expenses	33,749	28,973	27,591
Selling, general and administrative	12,895	17,891	9,396
Selling, general and administrative – affiliate	5,288	4,729	3,990
Depreciation	15,704	11,680	7,261
Amortization	14,714	10,819	5,427
Loss on revaluation of contingent consideration, net	1,043	0	0
Long-lived asset impairment	0	0	6,114
Total operating expenses	83,393	74,092	59,779
Operating income (loss)	21,988	7,697	(4,873)
Other income (expense):
Equity earnings from unconsolidated affiliate	9,852	10,030	9,895
Other income	3	9	17
Interest expense	(9,811)	(6,873)	(3,706)
Total other income (expenses), net	44	3,166	6,206
Income (loss) before income taxes	22,032	10,863	1,333
Income taxes	124	119	58
Net income (loss)	21,908	10,744	1,275
Net income attributable to non-controlling interests	(6,866)	(4,315)
Net income (loss) attributable to partners’ capital	15,042	6,429	1,275
Other comprehensive income (loss)	1,364	945	(144)
Comprehensive income (loss) attributable to partners’ capital	$ 16,406	$ 7,374	$ 1,131
Common Units [Member]
Earnings per limited partner unit:
Earnings per limited partner unit, basic and diluted	$ 0.83	$ 0.39	$ 0.05
Subordinated Units [Member]
Earnings per limited partner unit:
Earnings per limited partner unit, basic and diluted	$ 0.47	$ 0.22	$ 0.05