Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities:
Net income	$ 93,524	$ 90,065
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	31,510	29,363
Debt placement fee amortization	519	385
Loss on sale, retirement and impairment of assets	5,407	1,830
Equity earnings	(1,648)	(1,367)
Distributions from equity investments	1,648	1,367
Equity-based incentive compensation expense	2,843	3,750
Amortization of prior service credit and actuarial loss	852	78
Changes in operating assets and liabilities:
Restricted cash		14,379
Trade accounts receivable and other accounts receivable	(22,814)	(8,658)
Inventory	18,693	(8,151)
Energy commodity derivatives contracts, net of derivatives deposits	(8,358)	(1,404)
Reimbursable costs	1,085	6,263
Accounts payable	(16,863)	2,596
Accrued payroll and benefits	(13,984)	(13,388)
Accrued interest payable	(7,288)	(4,285)
Accrued taxes other than income	(5,707)	(6,163)
Accrued product purchases	7,705	37,311
Current and noncurrent environmental liabilities	(2,109)	2,032
Other current and noncurrent assets and liabilities	4,726	1,382
Net cash provided by operating activities	89,741	147,385
Investing Activities:
Additions to property, plant and equipment	(37,139)	(50,219)
Proceeds from sale and disposition of assets	40	27
Increase (decrease) in accounts payable related to capital expenditures	(1,979)	2,583
Acquisition of assets		(7,363)
Acquisition of non-controlling owners' interests		(40,500)
Equity investments	(3,655)	(1,500)
Distributions in excess of equity investment earnings	870	151
Other		(1,100)
Net cash used by investing activities	(41,863)	(97,921)
Financing Activities:
Distributions paid	(92,177)	(85,398)
Net borrowings under revolver		62,000
Increase (decrease) in outstanding checks	(678)	2,393
Settlement of tax withholdings on long-term incentive compensation	(13,001)	(7,410)
Net cash used by financing activities	(105,856)	(28,415)
Change in cash and cash equivalents	(57,978)	21,049
Cash and cash equivalents at beginning of period	209,620	7,483
Cash and cash equivalents at end of period	151,642	28,532
Supplemental non-cash financing activity:
Issuance of limited partner units in settlement of equity-based incentive plan awards	$ 7,295	$ 4,315