Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 38,614	$ 15,737
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,516	18,891
Reserve for doubtful accounts	(11)	126
Amortization of deferred financing costs	989	685
Unit-based compensation expense	3,732	1,312
Deferred income taxes	(522)	0
Gain on disposal of assets, net	(3,227)	(901)
Changes in operating assets and liabilities:
Accounts receivable - Third-party	12,917	(7,750)
Accounts receivable - Affiliate	(6,802)	(3,142)
Inventories	4	3,109
Prepaid expenses	1,441	(539)
Other assets	4,597	2,057
Accounts payable and accrued liabilities	409	18,379
Net cash provided by operating activities	71,657	47,964
Cash flows from investing activities:
Capital expenditures	(14,317)	(16,088)
Increase in Restricted Cash	(14,347)	0
Proceeds from sale of assets	14,769	977
Net cash used in investing activities	(13,895)	(15,111)
Cash flows from financing activities:
Payments on revolving credit facility	0	(125,000)
Proceeds from issuance of common units	0	92,460
Payments of Stock Issuance Costs	0	(330)
Deferred financing costs	(78)	0
Quarterly distributions to affiliate	(33,705)	(26,947)
Quarterly distributions to common unitholders - public	(26,467)	(12,633)
Payments of tax withholdings for unit-based compensation	1,633	548
Contributions from affiliate	0	13,102
Net cash used in financing activities	(61,883)	(59,896)
Net change in cash and cash equivalents	(4,121)	(27,043)
Cash and cash equivalents at beginning of period	14,652	44,605
Cash and cash equivalents at end of period	10,531	17,562
Supplemental disclosure of cash flow information:
Interest paid	12,285	13,111
Income taxes paid	89	94
Supplemental disclosure of non-cash investing and financing activities:
Accrued capital expenditures	4,617	4,938
Conversion of subordinated units	$ 367,766	$ 0