Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 31,881	$ 28,064
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,469	12,562
Reserve for doubtful accounts	126	88
Amortization of loan fees	685	579
Unit-based compensation expense	1,312	920
Gain on disposal of assets, net	(901)	(244)
Changes in operating assets and liabilities:
Accounts receivable - Third-party	(7,750)	(15,136)
Accounts receivable - Affiliate	(3,142)	(7,533)
Inventories	3,109	(1,688)
Prepaid expenses	(539)	258
Other assets	1,957	(866)
Accounts payable and accrued liabilities	17,792	31,128
Net cash provided by operating activities	58,999	48,132
Cash flows from investing activities:
Capital expenditures	(14,569)	(41,490)
Proceeds from sale of assets	977	290
Net cash used in investing activities	(13,592)	(41,200)
Cash flows from financing activities:
Additions to long-term debt	0	300,000
Payments on revolving credit facility	(125,000)	(269,000)
Offering costs for issuance of common units	92,460	0
Payments of Stock Issuance Costs	330	0
Deferred financing costs	0	(6,820)
Quarterly distributions to Western	(26,947)	(21,215)
Quarterly distributions to common unitholders - public	(12,633)	(10,772)
Contributions from affiliate	0	25,127
Net cash provided by (used in) financing activities	(72,450)	17,320
Net change in cash and cash equivalents	(27,043)	24,252
Cash and cash equivalents at beginning of period	44,605	54,298
Cash and cash equivalents at end of period	17,562	78,550
Supplemental disclosure of cash flow information:
Interest paid	13,111	957
Income taxes paid	94	581
Supplemental disclosure of non-cash investing activities:
Accrued capital expenditures	4,860	4,998
Transfer of capital spares from other assets to fixed assets	$ 161	$ 0