Consolidated Statements of Operations and Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Third-party customers	$ 70,497,000	$ 45,676,000	$ 39,662,000
Related parties	11,292,000	9,230,000	8,179,000
Revenues	81,789,000	54,906,000	47,841,000
Expenses:
Operating expenses	28,973,000	27,591,000	19,291,000
Selling, general and administrative	17,891,000	9,396,000	7,116,000
Selling, general and administrative – affiliate	4,729,000	3,990,000	2,484,000
Depreciation	11,680,000	7,261,000	5,836,000
Amortization	10,819,000	5,427,000	4,756,000
Long-lived asset impairment	0	6,114,000	0
Total expenses	74,092,000	59,779,000	39,483,000
Operating income (loss)	7,697,000	(4,873,000)	8,358,000
Other income (expense):
Gain on bargain purchase of business			11,777,000
Equity earnings from unconsolidated affiliate	10,030,000	9,895,000	1,307,000
Other income	9,000	17,000	48,000
Interest expense	(6,873,000)	(3,706,000)	(8,639,000)
Total other income (expenses), net	3,166,000	6,206,000	4,493,000
Income (loss) before income taxes	10,863,000	1,333,000	12,851,000
Income taxes	119,000	58,000	20,000
Net income (loss)	10,744,000	1,275,000	12,831,000
Net income attributable to non-controlling interests	(4,315,000)
Net income attributable to preferred units			(1,770,000)
Net income (loss) attributable to partners’ capital	6,429,000	1,275,000	11,061,000
Other comprehensive income (loss)	945,000	(144,000)	492,000
Comprehensive income (loss) attributable to partners’ capital	$ 7,374,000	$ 1,131,000	$ 11,553,000
Common Units [Member]
Earnings per limited partner unit, basic:
Earnings per limited partner unit, basic	$ 0.39	$ 0.05	$ 0.23
Earnings per limited partner unit, diluted:
Earnings per limited partner unit, diluted	0.39	0.05	0.10
Subordinated Units [Member]
Earnings per limited partner unit, basic:
Earnings per limited partner unit, basic	0.22	0.05	1.56
Earnings per limited partner unit, diluted:
Earnings per limited partner unit, diluted	$ 0.22	$ 0.05	$ 1.56