Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 15,323us-gaap_NetIncomeLoss	$ 16,324us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,738	4,152
Reserve for doubtful accounts	27us-gaap_ProvisionForDoubtfulAccounts	0us-gaap_ProvisionForDoubtfulAccounts
Amortization of loan fees	235us-gaap_AmortizationOfFinancingCosts	129us-gaap_AmortizationOfFinancingCosts
Unit-based compensation expense	415us-gaap_RestrictedStockExpense	221us-gaap_RestrictedStockExpense
Gain on disposal of assets, net	(84)	0
Changes in operating assets and liabilities:
Accounts receivable - Third-party	(8,066)	54
Accounts receivable - Affiliate	(3,558)	(362)
Inventories	(551)us-gaap_IncreaseDecreaseInInventories	713us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	1,405	237
Other assets	(2,179)	(84)
Accounts payable and accrued liabilities	25,740	3,092
Other long-term liabilities	0	5
Net cash provided by operating activities	33,445	24,481
Cash flows from investing activities:
Capital expenditures	(8,562)	(8,379)
Distribution to Predecessor affiliate		(6,170)
Proceeds from sale of assets	117	0
Net cash used in investing activities	(8,445)	(14,549)
Cash flows from financing activities:
Additions to long-term debt	300,000	0
Payments on revolving credit facility	(269,000)	0
Deferred financing costs	(6,551)us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts
Quarterly distributions to Western	(10,314)	(7,175)
Quarterly distributions to non-controlling interest holders	(5,261)us-gaap_PaymentsToMinorityShareholders	(3,806)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	8,874	(10,981)
Net change in cash and cash equivalents	33,874	(1,049)
Cash and cash equivalents at beginning of period	54,298	84,004
Cash and cash equivalents at end of period	88,172	82,955
Supplemental disclosure of cash flow information:
Interest paid	725us-gaap_InterestPaid	225us-gaap_InterestPaid
Income taxes paid	1us-gaap_IncomeTaxesPaidNet	0us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash investing activities:
Accrued capital expenditures	$ 616	$ 195

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