CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (9,411)	$ 89,079	$ 35,170
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	28,441	24,803	20,828
Equity-based compensation expense	3,532	9,042	5,734
Project termination costs - non-cash portion	10,345	0	0
Interest paid in-kind	0	0	3,202
Loss on extinguishment of debt	0	0	907
Provision for doubtful accounts	1,541	253	190
Loss (gain) on disposal of assets	146	8	755
Amortization of debt discount/premium and deferred financing costs	1,244	969	937
Loss on termination of sand supply agreement	0	689	0
Unrealized loss on derivative instruments	(419)	669	(247)
Other non-cash	110	38	(244)
Changes in operating assets and liabilities, net of business acquired:
Restricted cash and equivalents	0	6,188	(6,188)
Accounts receivable	36,938	(26,328)	(17,374)
Inventories	(10,341)	9,044	(11,451)
Prepaid expenses and other current assets	(1,861)	(5,104)	5,064
Accounts payable and accrued liabilities	(8,592)	(14,971)	20,871
Other assets	(4,348)	(8,218)	(118)
Net cash provided by operating activities	47,325	86,161	58,036
Cash flows from investing activities:
Purchases of property, plant, equipment and intangible assets	(35,474)	(77,884)	(21,369)
Business acquisitions, net of cash acquired	0	(11,000)	(16,687)
Proceeds from disposals of assets	1,787	335	35
Collection of notes receivable	13	377	12
Net cash used in investing activities	(33,674)	(88,172)	(38,009)
Cash flows from financing activities:
Proceeds from IPO including over commitment	0	0	122,221
IPO offering costs	0	0	(5,647)
Proceeds from line of credit borrowings	284,200	371,657	134,180
Repayments of line of credit borrowings	(204,000)	(243,603)	(61,619)
Repayment of Direct Fuels' debt	0	0	(21,673)
Proceeds from other long-term debt	0	0	81
Repayments of other long-term debt	(53)	(180)	(118,640)
Distributions to unitholders	(74,351)	(112,992)	(29,539)
Distributions to Predecessor owners	0	0	(19,628)
Pre-IPO dividends paid (Direct Fuels)	0	0	(11,500)
Payment of business acquisition obligation	(2,253)	0	0
Payment of financing costs	(2,528)	(2,342)	(3,709)
Payments on capital lease obligation	(987)	(5,831)	(3,507)
Repayments of other debt	0	0	(345)
Redemption of general partner interest	0	0	(2)
Recovery of short swing profit	315	11	0
Net cash provided by (used in) financing activities	343	6,720	(19,327)
Cash and cash equivalents:
Net increase (decrease)	13,994	4,709	700
Balance at beginning of year	6,876	2,167	1,467
Balance at end of year	$ 20,870	$ 6,876	$ 2,167