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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 414,611 $ 262,291
Adjustments to reconcile net income to net cash provided by operating activities:    
Loss on disposal of assets and impairments 6,852 122,098
Depreciation 423,866 395,008
Amortization of intangibles 79,444 76,886
Foreign currency transaction loss 323 3,502
Deferred income taxes, net of acquisitions 45,765 (10,971)
Amortization of debt issuance costs 3,087 3,221
Share-based compensation 35,434 32,407
Interest income on restricted investments (143) (387)
Interest accretion 11,135 10,406
Adjustments to contingent consideration 349 17,754
Payment of contingent consideration recorded in earnings (11)  
Net change in operating assets and liabilities, net of acquisitions 17,080 (23,840)
Net cash provided by operating activities 1,037,792 888,375
Cash flows from investing activities:    
Payments for acquisitions, net of cash acquired (500,064) (394,002)
Capital expenditures for property and equipment (373,512) (317,385)
Proceeds from disposal of assets 3,698 25,826
Change in restricted investments, net of interest income   1,920
Other (568) (3,465)
Net cash used in investing activities (870,446) (687,106)
Cash flows from financing activities:    
Proceeds from long-term debt 165,737 896,947
Principal payments on notes payable and long-term debt (387,700) (666,724)
Payment of contingent consideration recorded at acquisition date (5,459) (5,840)
Change in book overdraft (243) 13,814
Proceeds from option and warrant exercises   1,946
Payments for repurchase of common shares (42,040)  
Payments for cash dividends (110,447) (95,201)
Tax withholdings related to net share settlements of equity-based compensation (14,976) (13,754)
Debt issuance costs (2,839) (3,638)
Proceeds from sale of common shares held in trust 2,381 8,704
Other (103) (1,095)
Net cash provided by (used in) financing activities (395,689) 135,159
Effect of exchange rate changes on cash, cash equivalents and restricted cash (528) 976
Net increase (decrease) in cash, cash equivalents and restricted cash (228,871) 337,404
Cash, cash equivalents and restricted cash at beginning of period 556,467 169,112
Plus (less): change in cash held for sale 192 (27)
Cash, cash equivalents and restricted cash at end of period 327,788 506,489
Non-cash financing activities:    
Liabilities assumed and notes payable issued to sellers of businesses acquired $ 100,753 143,495
Non-cash consideration received for asset sales   $ 92,972