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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities:      
Net income $ 771,312 $ 747,171 $ 750,698
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation & amortization 447,883 416,608 398,618
Gains on sales of assets and businesses, net of losses 0 0 (3,615)
Stock-based compensation expense 56,738 48,109 39,971
Changes in assets & liabilities, net of effects from acquisitions and dispositions:      
Accounts receivable (24,719) (87,881) (45,814)
Accrued interest 705 9,766 (693)
Accrued and deferred income taxes (6,405) 22,068 (34,394)
Other working capital accounts (15,165) 74,489 (125,556)
Other assets and deferred charges (28,607) (25,671) 6,631
Other (42,564) 81,139 23,295
Excess income tax benefits related to stock-based compensation 0 45,219 47,364
Accrued insurance expense, net of commercial premiums paid 102,595 84,638 90,895
Payments made in settlement of self-insurance claims (79,192) (81,962) (79,138)
Net cash provided by operating activities 1,182,581 1,333,693 1,068,262
Cash Flows from Investing Activities:      
Property and equipment additions, net of disposals (557,506) (519,939) (379,321)
Acquisition of property and businesses (22,878) (613,803) (533,655)
Proceeds received from sales of assets and businesses 108 0 3,391
Costs incurred for purchase and implementation of information technology applications (29,047) (21,475) 0
Increase in capital reserves of commercial insurance subsidiary (7,100) (32,000) (3,300)
Investment in, and advances to, joint venture (7,976) 0 0
Net cash used in investing activities (624,399) (1,187,217) (912,885)
Cash Flows from Financing Activities:      
Reduction of long-term debt (143,106) (459,183) (68,166)
Additional borrowings 41,100 1,170,800 234,400
Acquisition of noncontrolling interests in majority owned businesses 0 (418,000) 0
Financing costs (76) (12,449) (515)
Repurchase of common shares (364,401) (353,380) (209,782)
Dividends paid (38,211) (38,875) (39,532)
Issuance of common stock 10,254 9,503 8,441
Profit distributions to noncontrolling interests (24,713) (69,583) (62,220)
Proceeds received from sale/leaseback of real property 0 0 12,765
Net cash used in financing activities (519,153) (171,167) (124,609)
Effect of exchange rate changes on cash and cash equivalents 1,647 (2,790) (1,609)
Increase (decrease) in cash and cash equivalents 40,676 (27,481) 29,159
Cash and cash equivalents, beginning of period 33,747 61,228 32,069
Cash and cash equivalents, end of period 74,423 33,747 61,228
Supplemental Disclosures of Cash Flow Information:      
Interest paid 135,533 107,079 107,054
Income taxes paid, net of refunds 370,855 344,611 380,658
Noncash purchases of property and equipment $ 82,496 $ 65,702 $ 49,086