Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities:
Net income	$ 394,929	$ 361,027
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	87,056	82,137
Loss on sale and retirement of assets	3,263	2,084
Earnings of non-controlled entities	(32,967)	(34,132)
Distributions of earnings from investments in non-controlled entities	31,080	31,243
Equity-based incentive compensation expense	10,059	10,539
Amortization of prior service credit and actuarial loss	746	1,739
Gain on exchange of interest in non-controlled entity	(28,144)	0
Changes in operating assets and liabilities:
Trade accounts receivable and other accounts receivable	(10,703)	3,096
Inventory	(25,562)	(2,158)
Energy commodity derivatives contracts, net of derivatives deposits	(17,121)	(1,411)
Accounts payable	9,125	8,406
Accrued payroll and benefits	(14,937)	(14,722)
Accrued interest payable	10,998	6,064
Accrued taxes other than income	(6,463)	(1,023)
Accrued product purchases	(8,858)	(22,726)
Deferred revenue	16,935	36
Current and noncurrent environmental liabilities	(2,695)	116
Other current and noncurrent assets and liabilities	(9,673)	(15,496)
Net cash provided by operating activities	407,068	414,819
Investing Activities:
Additions to property, plant and equipment, net(1)	(310,133)	(275,848)
Proceeds from sale and disposition of assets	4,756	3,153
Acquisition of business	0	(54,678)
Investments in non-controlled entities	(109,933)	(36,443)
Distributions in excess of earnings of non-controlled entities	1,942	0
Net cash used by investing activities	(413,368)	(363,816)
Financing Activities:
Distributions paid	(361,605)	(321,239)
Net commercial paper repayments	(255,966)	(151,960)
Borrowings under long-term notes	649,187	499,589
Debt placement costs	(5,408)	(4,734)
Net payment on financial derivatives	0	(42,908)
Settlement of tax withholdings on long-term incentive compensation	(14,376)	(17,784)
Net cash provided (used) by financing activities	11,832	(39,036)
Change in cash and cash equivalents	5,532	11,967
Cash and cash equivalents at beginning of period	28,731	17,063
Cash and cash equivalents at end of period	34,263	29,030
Supplemental non-cash investing and financing activities:
Contribution of property, plant and equipment to a non-controlled entity	0	13,252
Issuance of limited partner units in settlement of equity-based incentive plan awards	7,092	8,045
(1) Additions to property, plant and equipment	(321,085)	(268,849)
Changes in accounts payable and other current liabilities related to capital expenditures	10,952	(6,999)
Additions to property, plant and equipment, net	$ (310,133)	$ (275,848)