Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities:
Net income	$ 287,564	$ 207,663
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairment expense	63,534	61,871
Gain on sale and retirement of assets	(13,002)	(21,759)
Earnings of non-controlled entities	(43,660)	(31,255)
Distributions from operations of non-controlled entities	54,743	43,069
Equity-based incentive compensation expense	155	4,914
Settlement gain, amortization of prior service credit and actuarial loss	1,113	1,303
Debt prepayment costs	0	8,270
Changes in operating assets and liabilities:
Trade accounts receivable and other accounts receivable	29,988	(36,886)
Inventory	112,007	(9,313)
Accounts payable	7,926	2,909
Accrued payroll and benefits	(43,962)	(39,065)
Accrued interest payable	(16,792)	(16,470)
Accrued taxes other than income	(17,673)	(12,020)
Accrued product liabilities	(38,440)	18,949
Deferred revenue	3,656	(2,395)
Other current and noncurrent assets and liabilities	(2,536)	26,771
Net cash provided by operating activities	384,621	206,556
Investing Activities:
Additions to property, plant and equipment, net	(172,671)	(206,436)
Proceeds from sale and disposition of assets	332,789	53,676
Investments in non-controlled entities	(28,325)	(76,634)
Distributions from returns of investments in non-controlled entities	0	7,500
Net cash provided (used) by investing activities	131,793	(221,894)
Financing Activities:
Distributions paid	(234,774)	(227,832)
Net commercial paper borrowings	0	69,000
Borrowings under long-term notes	0	496,855
Payments on notes	0	(550,000)
Debt placement costs	0	(5,355)
Net payment on financial derivatives	0	(8,028)
Payments associated with settlement of equity-based incentive compensation	(14,700)	(9,764)
Debt prepayment costs	0	(8,270)
Repurchases of common units	201,982	0
Net cash used by financing activities	(451,456)	(243,394)
Change in cash, cash equivalents and restricted cash	64,958	(258,732)
Cash, cash equivalents and restricted cash at beginning of period	84,599	309,261
Cash, cash equivalents and restricted cash at end of period	149,557	50,529
Supplemental non-cash investing activities:
Additions to property, plant and equipment	(152,292)	(260,734)
Changes in accounts payable and other current liabilities related to capital expenditures	(20,379)	54,298
Additions to property, plant and equipment, net	$ (172,671)	$ (206,436)