Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 207,663	$ 210,910
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairment expense	61,871	51,879
Loss (gain) on sale and retirement of assets	(21,759)	1,997
Earnings of non-controlled entities	(31,255)	(34,538)
Distributions from operations of non-controlled entities	43,069	51,754
Equity-based incentive compensation expense	4,914	6,632
Amortization of prior service credit and actuarial loss	1,303	5,069
Debt prepayment penalty	8,270	0
Changes in operating assets and liabilities:
Trade accounts receivable and other accounts receivable	(36,886)	23,371
Inventory	(9,313)	(13,642)
Energy commodity derivatives contracts, net of derivatives deposits	7,135	617
Accounts payable	2,909	19,457
Accrued payroll and benefits	(39,065)	(26,544)
Accrued interest payable	(16,470)	(17,956)
Accrued taxes other than income	(12,020)	(16,721)
Accrued product liabilities	18,949	(10,893)
Deferred revenue	(2,395)	1,463
Current and noncurrent environmental liabilities	(1,947)	(359)
Other current and noncurrent assets and liabilities	21,583	25,406
Net cash provided by operating activities	206,556	277,902
Investing Activities:
Additions to property, plant and equipment, net	(206,436)	(99,471)
Proceeds from sale and disposition of assets	53,676	214
Investments in non-controlled entities	(76,634)	(60,976)
Distributions from returns of investments in non-controlled entities	7,500	0
Net cash used by investing activities	(221,894)	(160,233)
Financing Activities:
Distributions paid	(227,832)	(209,940)
Net commercial paper borrowings	69,000	0
Borrowings under long-term notes	496,855	0
Payments on notes	(550,000)	0
Debt placement costs	(5,355)	(315)
Net payment on financial derivatives	(8,028)	0
Payments associated with settlement of equity-based incentive compensation	(9,764)	(9,285)
Debt prepayment penalty	(8,270)	0
Net cash used by financing activities	(243,394)	(219,540)
Change in cash, cash equivalents and restricted cash	(258,732)	(101,871)
Cash, cash equivalents and restricted cash at beginning of period	309,261	176,068
Cash, cash equivalents and restricted cash at end of period	50,529	74,197
Supplemental non-cash investing and financing activities:
Issuance of limited partner units in settlement of equity-based incentive plan awards	480	120
Additions to property, plant and equipment	(260,734)	(105,384)
Changes in accounts payable and other current liabilities related to capital expenditures	54,298	5,913
Additions to property, plant and equipment, net	$ (206,436)	$ (99,471)