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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 (loss) $ 433,490 $ 414,611
Adjustments to reconcile net income to net cash provided by operating activities:    
Loss on disposal of assets and impairments 31,852 6,852
Depreciation 461,616 423,866
Amortization of intangibles 93,821 79,444
Amortization of leases 17,661  
Deferred income taxes, net of acquisitions 41,481 45,765
Amortization of debt issuance costs 3,708 3,087
Share-based compensation 35,510 35,434
Interest accretion 12,283 11,135
Payment of contingent consideration recorded in earnings   (11)
Adjustments to contingent consideration 1,466 349
Other (1,316) 180
Net change in operating assets and liabilities, net of acquisitions 53,858 17,080
Net cash provided by operating activities 1,185,430 1,037,792
Cash flows from investing activities:    
Payments for acquisitions, net of cash acquired (420,392) (500,064)
Capital expenditures for property and equipment (433,526) (373,512)
Capital expenditure for purchase of greenfield landfill site (31,683)  
Proceeds from disposal of assets 2,626 3,698
Change in restricted investments, net of interest income (2,171)  
Other (526) (568)
Net cash used in investing activities (885,672) (870,446)
Cash flows from financing activities:    
Proceeds from long-term debt 1,021,795 165,737
Principal payments on notes payable and long-term debt (1,184,165) (387,700)
Payment of contingent consideration recorded at acquisition date (1,621) (5,459)
Change in book overdraft 1,911 (243)
Payments for repurchase of common shares   (42,040)
Payments for cash dividends (126,348) (110,447)
Tax withholdings related to net share settlements of equity-based compensation (17,592) (14,976)
Debt issuance costs (5,938) (2,839)
Proceeds from sale of common shares held in trust 4,036 2,381
Other (117) (103)
Net cash used in financing activities (308,039) (395,689)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 143 (528)
Net increase (decrease) in cash, cash equivalents and restricted cash (8,138) (228,871)
Cash, cash equivalents and restricted cash at beginning of period 403,966 556,467
Plus: change in cash held for sale   192
Cash, cash equivalents and restricted cash at end of period 395,828 327,788
Non-cash financing activities:    
Liabilities assumed and notes payable issued to sellers of businesses acquired $ 94,009 $ 100,753