Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 88,172	$ 54,298
Accounts receivable:
Affiliate	55,614	52,056
Third-party, net of a reserve for doubtful accounts of $137 and $107, respectively	62,824	54,785
Inventories	15,034	14,483
Prepaid expenses	6,871	8,276
Other current assets	4,473	2,550
Total current assets	232,988	186,448
Property, plant and equipment, net	185,191	182,545
Intangible assets, net	4,046	4,185
Other assets, net	11,785	5,095
Total assets	434,010	378,273
Accounts payable:
Third-party	128,163	105,715
Affiliate	10,840	11,455
Accrued liabilities, including deferred revenue from affiliate of $8,011 and $6,779, respectively	22,445	19,197
Total current liabilities	161,448	136,367
Long-term liabilities:
Long-term debt, less current portion	300,000	269,000
Total long-term liabilities	300,000	269,000
Commitments and contingencies
Equity (Deficit):
General partner	(16)	0
Common unitholders - Public (15,858,156 and 15,823,408 units issued and outstanding, respectively)	327,422	327,592
Common unitholders - Western (8,158,592 units issued and outstanding)	(94,625)	(94,583)
Subordinated unitholders - Western (22,811,000 units issued and outstanding)	(260,219)	(260,103)
Total equity	(27,438)	(27,094)
Total liabilities and equity	$ 434,010	$ 378,273