Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net income	$ 579,533	$ 634,261
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation & amortization	362,736	335,002
Stock-based compensation expense	52,167	50,645
Gain on sale of assets and businesses	(5,982)	(2,513)
Provision for asset impairment	97,631	0
Changes in assets & liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	(37,332)	(74,129)
Accrued interest	(2,962)	(5,808)
Accrued and deferred income taxes	(53,714)	(53,165)
Other working capital accounts	90,262	89,157
Other assets and deferred charges	15,237	(37,133)
Other	(56,465)	(3,080)
Accrued insurance expense, net of commercial premiums paid	76,245	69,386
Payments made in settlement of self-insurance claims	(68,046)	(53,223)
Net cash provided by operating activities	1,049,310	949,400
Cash Flows from Investing Activities:
Property and equipment additions, net of disposals	(480,247)	(521,349)
Acquisition of property and businesses	0	(108,016)
Inflows from foreign exchange contracts that hedge our net U.K. investment	90,286	26,088
Proceeds received from sales of assets and businesses	7,497	13,502
Costs incurred for purchase and implementation of information technology applications	(18,240)	(25,487)
Decrease in capital reserves of commercial insurance subsidiary	0	100
Investment in, and advances to, joint ventures and other	(11,949)	(13,910)
Net cash used in investing activities	(412,653)	(629,072)
Cash Flows from Financing Activities:
Reduction of long-term debt	(68,175)	(99,969)
Additional borrowings	15,100	82,400
Financing costs	0	(774)
Repurchase of common shares	(587,976)	(261,256)
Dividends paid	(35,556)	(28,086)
Issuance of common stock	8,248	7,737
Profit distributions to noncontrolling interests	(11,887)	(8,243)
Net cash used in financing activities	(680,246)	(308,191)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,259)	(1,742)
(Decrease) Increase in cash, cash equivalents and restricted cash	(44,848)	10,395
Cash, cash equivalents and restricted cash, beginning of period	199,685	167,297
Cash, cash equivalents and restricted cash, end of period	154,837	177,692
Supplemental Disclosures of Cash Flow Information:
Interest paid	122,699	114,162
Income taxes paid, net of refunds	221,298	247,486
Noncash purchases of property and equipment	83,552	$ 88,932
Right-of-use assets obtained in exchange for lease obligations	$ 364,453