Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities:
Net income	$ 231,345	$ 193,064
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	62,996	60,027
Debt placement fee amortization	1,037	770
Loss on sale, retirement and impairment of assets	7,359	7,106
Equity earnings	(3,126)	(2,810)
Distributions from equity investments	3,126	2,710
Equity-based incentive compensation expense	7,008	9,017
Amortization of prior service credit and actuarial loss	1,705	155
Changes in operating assets and liabilities:
Restricted cash		14,379
Trade accounts receivable and other accounts receivable	(1,025)	9,830
Inventory	43,193	(69,588)
Energy commodity derivatives contracts, net of derivatives deposits	25,665	(14,159)
Reimbursable costs	849	5,925
Accounts payable	(9,882)	7,001
Accrued payroll and benefits	(8,488)	(7,220)
Accrued interest payable		372
Accrued taxes other than income	(2,714)	(3,412)
Accrued product purchases	(4,658)	(1,063)
Contingent liabilities	(805)	14,025
Current and noncurrent environmental liabilities	(6,066)	6,866
Other current and noncurrent assets and liabilities	(9,033)	(14,940)
Net cash provided by operating activities	338,486	218,055
Investing Activities:
Additions to property, plant and equipment	(108,098)	(95,273)
Proceeds from sale and disposition of assets	237	753
Increase in accounts payable related to capital expenditures	9,533	532
Acquisition of assets		(17,798)
Acquisition of non-controlling owners' interests		(40,500)
Equity investments	(15,872)	(3,500)
Distributions in excess of equity investment earnings	1,227
Other		(1,100)
Net cash used by investing activities	(112,973)	(156,886)
Financing Activities:
Distributions paid	(187,181)	(172,205)
Net borrowings under revolver		135,000
Decrease in outstanding checks	(1,235)	(11,045)
Settlement of tax withholdings on long-term incentive compensation	(13,001)	(7,410)
Net cash used by financing activities	(201,417)	(55,660)
Change in cash and cash equivalents	24,096	5,509
Cash and cash equivalents at beginning of period	209,620	7,483
Cash and cash equivalents at end of period	233,716	12,992
Supplemental non-cash financing activity:
Issuance of limited partner units in settlement of equity-based incentive plan awards	$ 7,295	$ 4,315