Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net income	$ 433,136	$ 394,929
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	96,194	87,056
Loss on sale and retirement of assets	5,331	3,263
Earnings of non-controlled entities	(47,022)	(32,967)
Distributions of earnings from investments in non-controlled entities	46,754	31,080
Equity-based incentive compensation expense	10,717	10,059
Settlement cost, amortization of prior service credit and actuarial loss	4,846	746
Gain on exchange of interest in non-controlled entity	0	(28,144)
Changes in operating assets and liabilities:
Trade accounts receivable and other accounts receivable	2,681	(10,703)
Inventory	14,927	(25,562)
Energy commodity derivatives contracts, net of derivatives deposits	10,538	(17,121)
Accounts payable	13,132	9,125
Accrued payroll and benefits	(5,509)	(14,937)
Accrued interest payable	(184)	10,998
Accrued taxes other than income	(6,757)	(6,463)
Accrued product purchases	(4,797)	(8,858)
Deferred revenue	13,132	16,935
Current and noncurrent environmental liabilities	(5,189)	(2,695)
Other current and noncurrent assets and liabilities	(9,519)	(9,673)
Net cash provided by operating activities	572,411	407,068
Investing Activities:
Additions to property, plant and equipment, net(1)	(281,504)	(310,133)
Proceeds from sale and disposition of assets	4,886	4,756
Investments in non-controlled entities	(55,273)	(109,933)
Distributions in excess of earnings of non-controlled entities	11,152	1,942
Net cash used by investing activities	(320,739)	(413,368)
Financing Activities:
Distributions paid	(393,912)	(361,605)
Net commercial paper borrowings (repayments)	146,885	(255,966)
Borrowings under long-term notes	0	649,187
Debt placement costs	0	(5,408)
Payments associated with settlement of equity-based incentive compensation	(13,875)	(14,376)
Net cash provided (used) by financing activities	(260,902)	11,832
Change in cash and cash equivalents	(9,230)	5,532
Cash and cash equivalents at beginning of period	14,701	28,731
Cash and cash equivalents at end of period	5,471	34,263
Supplemental non-cash investing and financing activities:
Issuance of limited partner units in settlement of equity-based incentive plan awards	1,669	7,092
Additions to property, plant and equipment	(289,570)	(321,085)
Changes in accounts payable and other current liabilities related to capital expenditures	8,066	10,952
Additions to property, plant and equipment, net	$ (281,504)	$ (310,133)