Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flow from operating activities:
Net income	$ 10,744,000	$ 1,275,000	$ 12,831,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	11,680,000	7,261,000	5,836,000
Amortization	10,819,000	5,427,000	4,756,000
Gain on bargain purchase of business			(11,777,000)
Long-lived asset impairment	0	6,114,000	0
Equity earnings from unconsolidated affiliate, net of distributions	(544,000)	(68,000)	0
Amortization of deferred financing costs	1,031,000	496,000	4,428,000
Unit-based compensation	5,474,000	3,138,000	0
Changes in operating assets and liabilities
Trade accounts receivable	(4,887,000)	658,000	(3,430,000)
Due from related parties	(631,000)	(179,000)	120,000
Inventories	(33,000)	17,000	(47,000)
Other current assets	64,000	(449,000)	(606,000)
Accounts payable	1,248,000	(3,151,000)	1,765,000
Accrued expenses	3,712,000	(10,000)	680,000
Due to general partner	229,000	281,000	(88,000)
Other liabilities	(1,474,000)	2,756,000	(80,000)
Net cash provided by operating activities	37,432,000	23,566,000	14,388,000
Cash flows from investing activities:
Capital expenditures	(13,150,000)	(6,611,000)	(14,108,000)
Investment in unconsolidated affiliate	(361,000)	(1,197,000)	(72,740,000)
Distributions from unconsolidated affiliate, net of equity earnings			1,144,000
Net cash paid for acquisitions	(260,332,000)		(82,000,000)
Net cash used in investing activities	(273,843,000)	(7,808,000)	(167,704,000)
Cash flows from financing activities:
Distributions	(27,272,000)	(18,179,000)	(1,770,000)
Deferred financing costs	(3,239,000)	(518,000)	(5,248,000)
Repayments to credit facility		(25,000,000)	(50,937,000)
Proceeds from credit facility	115,000,000	30,500,000	126,000,000
Proceeds from equity offerings, net	72,026,000		117,296,000
Equity contribution from non-controlling interests	86,960,000
Payments of earn-out liability	(870,000)
Redemption of preferred units			(29,000,000)
Distributions paid to non-controlling interests	(6,000,000)
Distribution equivalent rights paid on unissued units	(923,000)	(416,000)
Net cash (used in) provided by financing activities	235,682,000	(13,613,000)	156,341,000
Net increase (decrease) in cash and cash equivalents	(729,000)	2,145,000	3,025,000
Cash and cash equivalents, beginning of period	6,599,000	4,454,000	1,429,000
Cash and cash equivalents, end of period	5,870,000	6,599,000	4,454,000
Supplemental disclosure of cash flow information:
Cash paid for interest, net of capitalized interest	6,112,000	3,398,000	4,589,000
Cash paid for income taxes	119,000	58,000	20,000
Non-cash investing and financing activities:
Deemed distributions to preferred units			1,770,000
Contribution of preferred units			1,000,000
Liabilities assumed in acquisition	4,523,000
Business acquisition purchase consideration - earn-out liability	19,700,000
(Decrease) Increase in purchases of property plant and equipment in accounts payable and accrued expenses	2,712,000	$ 1,173,000	414,000
Preferred Stock [Member]
Non-cash investing and financing activities:
Issuance of preferred/common units			$ 30,000,000
Common Stock [Member]
Non-cash investing and financing activities:
Issuance of preferred/common units	$ 30,200,000