Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net income	$ 259,200	$ 155,900	$ 143,100
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation and amortization	392,100	371,300	378,400
Gains on sales of assets	(130,900)	(121,200)	(99,400)
Asset Impairment Charges	1,500	48,900	2,400
Employee benefit plans	(4,300)	1,800	8,800
Share-based Payment Arrangement, Noncash Expense	18,300	12,700	17,400
Deferred income taxes	38,300	36,300	34,200
Share of affiliates’ earnings, net of dividends	(47,400)	12,700	(1,200)
Other	(6,400)	15,100	23,500
Investing Activities
Additions to operating assets and facilities	(1,665,000)	(1,255,800)	(1,130,100)
Acquisition of new businesses	0	0	(1,400)
Investments in affiliates	0	0	(400)
Portfolio investments and capital additions	(1,665,000)	(1,255,800)	(1,131,900)
Portfolio proceeds	272,800	269,600	187,100
Short-Term Investments	150,000
Proceeds from sales of other assets	20,200	31,100	54,700
Payments to Acquire Short-Term Investments		(148,500)	0
Payments for (Proceeds from) Other Investing Activities	2,700	30,100	(27,600)
Net cash used in investing activities	(1,219,300)	(1,073,500)
Net cash used in investing activities			(917,700)
Cash Provided by (Used in) Investing Activities, Discontinued Operations			1,100
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	1,420,000	848,300	1,491,900
Repayments of debt (original maturities longer than 90 days)	(500,000)	(250,000)	(884,000)
Net increase (decrease) in debt with original maturities of 90 days or less	(7,100)	0	(4,100)
Payments on capital lease obligations	0	(1,500)	(77,200)
Stock repurchases	(2,600)	(47,200)	(13,100)
Dividends	(80,600)	(76,600)	(74,300)
Other (add shares used to pay taxes)	14,400	31,400	23,900
Net Cash Provided by (Used in) Financing Activities	844,100	504,400	463,100
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	1,600	(4,900)	(1,800)
Net increase (decrease) in Cash, Cash Equivalents, and Restricted Cash during the year	146,800	(40,500)	51,900
Cash, Cash Equivalents, and Restricted Cash at beginning of period	304,000	344,500	292,600
Cash, Cash Equivalents, and Restricted Cash at end of period	450,800	304,000	344,500
Net Cash Provided by (Used in) Discontinued Operations			1,100
Net cash provided by operating activities	$ 520,400	$ 533,500	$ 507,200