Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities:
Net income	$ 144,460	$ 237,398
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation & amortization	124,394	120,040
Stock-based compensation expense	18,047	17,591
Changes in assets & liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	69,763	(101,619)
Accrued interest	(4,412)	(2,687)
Accrued and deferred income taxes	45,200	52,291
Other working capital accounts	73,929	107,878
Other assets and deferred charges	11,084	(3,771)
Other	(3,038)	2,605
Accrued insurance expense, net of commercial premiums paid	49,559	24,398
Payments made in settlement of self-insurance claims	(26,924)	(22,320)
Net cash provided by operating activities	502,062	431,804
Cash Flows from Investing Activities:
Property and equipment additions, net of disposals	(184,102)	(169,848)
Inflows (outflows) from foreign exchange contracts that hedge our net U.K. investment	51,691	(28,008)
Costs incurred for purchase and implementation of information technology applications	(1,857)	(9,678)
Investment in, and advances to, joint ventures and other	(751)	(879)
Net cash used in investing activities	(135,019)	(208,413)
Cash Flows from Financing Activities:
Reduction of long-term debt	(185,098)	(114,540)
Additional borrowings	5,453	8,700
Repurchase of common shares	(172,092)	(143,785)
Dividends paid	(17,344)	(9,081)
Issuance of common stock	3,002	2,726
Profit distributions to noncontrolling interests	(5,735)	(10,314)
Net cash used in financing activities	(371,814)	(266,294)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,673)	794
Decrease in cash, cash equivalents and restricted cash	(6,444)	(42,109)
Cash, cash equivalents and restricted cash, beginning of period	105,667	199,685
Cash, cash equivalents and restricted cash, end of period	99,223	157,576
Supplemental Disclosures of Cash Flow Information:
Interest paid	39,483	41,050
Income taxes paid, net of refunds	6,783	5,087
Noncash purchases of property and equipment	58,935	71,987
Right-of-use assets obtained in exchange for lease obligations	$ 29,112	$ 355,981