CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ 24,342	$ 16,022	$ 22,203
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,957	40,656	39,506
Amortization of deferred debt issue costs	3,755	4,814	1,689
Amortization of discount on notes payable	351	269	0
Deferred income taxes	(157)	(415)	294
(Gain) loss on disposition or sale of property, plant, and equipment	898	(136)	(4,996)
Gain on involuntary conversion of property, plant, and equipment	0	0	(1,017)
Equity in earnings of unconsolidated entities	(9,536)	(9,792)	(7,044)
Distributions from unconsolidated entities	0	0	650
Distribution in-kind from unconsolidated entities	12,704	10,545	5,826
Non-cash mark-to-market on derivatives	(3,293)	380	2,526
Other	190	113	98
Change in current assets and liabilities, excluding effects of acquisitions and dispositions:
Accounts and other receivables	(28,781)	(17,863)	(10,471)
Product exchange receivables	(8,547)	(4,967)	2,792
Inventories	(25,547)	(17,106)	7,135
Due from affiliates	469	(3,386)	1,560
Other current assets	407	(1,444)	2,461
Trade and other accounts payable	43,599	10,918	(15,874)
Product exchange payables	14,961	14,366	(2,938)
Due to affiliates	11,528	(6,853)	4,133
Income taxes payable	82	357	569
Other accrued liabilities	988	5,382	871
Change in other non-current assets and liabilities	3,500	(4,342)	(2,381)
Net cash provided by operating activities	86,870	37,518	47,592
Cash flows from investing activities:
Payments for property, plant, and equipment	(73,994)	(17,907)	(35,846)
Acquisitions, net of cash acquired	(16,815)	(41,762)	(327)
Payments for plant turnaround costs	(2,103)	(1,090)	0
Proceeds from sale of property, plant, and equipment	1,025	2,419	19,445
Insurance proceeds from involuntary conversion of property, plant and equipment	0	0	2,224
Investments in unconsolidated entities	(59,319)	(20,110)	0
Return of investments from unconsolidated entities	2,892	2,470	877
(Contributions to) unconsolidated entities for operations	(19,021)	(748)	(1,048)
Net cash used in investing activities	(167,335)	(76,728)	(14,675)
Cash flows from financing activities:
Payments of long-term debt	(442,000)	(441,868)	(430,500)
Payments of notes payable and capital lease obligations	(1,132)	(111)	(1,482)
Proceeds from long-term debt	529,000	503,856	433,700
Net proceeds from follow on public offering	70,330	78,600	0
General partner contribution	1,505	1,089	1,324
Redemption of common units	0	(28,070)	0
Excess purchase price over carrying value of acquired assets	(19,685)	(4,590)	0
Purchase of treasury units	(582)	(108)	(78)
Proceeds from issuance of common units	0	0	20,000
Payments of debt issuance costs	(3,588)	(7,468)	(10,446)
Cash distributions paid	(64,497)	(56,696)	(47,462)
Net cash provided by (used in) financing activities	69,351	44,634	(34,944)
Net increase (decrease) in cash	(11,114)	5,424	(2,027)
Cash at beginning of period	11,380	5,956	7,983
Cash at end of period	266	11,380	5,956
Purchase of assets under capital lease obligations	0	0	7,764
Issuance of common and subordinated units in connection with Cross acquisition	0	0	32,957
Purchase of assets under note payable	$ 0	$ 7,354	$ 0