Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 568,433	$ 559,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation & amortization	309,172	295,697
Stock-based compensation expense	36,358	30,145
Gain on sales of assets and businesses	0	(1,037)
Changes in assets & liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	(6,836)	(60,877)
Accrued interest	3,303	(297)
Accrued and deferred income taxes	12,187	(12,568)
Other working capital accounts	124,987	(54,018)
Other assets and deferred charges	(11,451)	6,629
Other	58,040	13,140
Accrued insurance expense, net of commercial premiums paid	66,049	75,715
Payments made in settlement of self-insurance claims	(60,137)	(55,411)
Net cash provided by operating activities	1,100,105	796,499
Cash Flows from Investing Activities:
Property and equipment additions, net of disposals	(396,163)	(269,578)
Proceeds received from sale of assets and businesses	0	2,744
Acquisition of property and businesses	(136,221)	(183,103)
Net cash used in investing activities	(532,384)	(449,937)
Cash Flows from Financing Activities:
Reduction of long-term debt	(814,971)	(207,371)
Additional borrowings and related funds	1,026,000	16,300
Acquisition of noncontrolling interests in majority owned businesses	(418,000)	0
Financing costs	(12,330)	0
Repurchase of common shares	(297,177)	(129,862)
Dividends paid	(29,197)	(29,696)
Issuance of common stock	6,379	6,030
Excess income tax benefits related to stock-based compensation	36,407	29,287
Profit distributions to noncontrolling interests	(61,053)	(35,965)
Proceeds received from sale/leaseback of real property	0	12,765
Net cash used in financing activities	(563,942)	(338,512)
Effect of exchange rate changes on cash and cash equivalents	(3,263)	(596)
Increase in cash and cash equivalents	516	7,454
Cash and cash equivalents, beginning of period	61,228	32,069
Cash and cash equivalents, end of period	61,744	39,523
Supplemental Disclosures of Cash Flow Information:
Interest paid	82,883	79,866
Income taxes paid, net of refunds	259,174	274,124
Noncash purchases of property and equipment	$ 45,319	$ 37,228