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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 117,747 $ 62,894
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 263,643 256,952
Stock-based compensation 49,023 42,536
Amortization of intangible assets 49,535 50,616
Amortization of debt issuance costs and debt discounts and premiums 2,995 4,099
Provision for allowance for doubtful accounts 4,594 3,281
Impairment charges 14,448 0
Loss on debt extinguishment 382 21,491
Other items 5,157 4,504
Changes in operating assets and liabilities:    
Accounts receivable (84,350) (71,275)
Income taxes, net 15,825 (15,381)
Other assets (7,833) (6,694)
Operating lease right-of-use assets 41,264  
Operating lease liabilities (38,886)  
Accounts payable and accrued expenses (11,463) (35,143)
Other liabilities (940) (16,973)
Net cash provided by operating activities 421,141 300,907
Cash flows from investing activities:    
Purchases of investments (9,297) (29,265)
Sales of investments 518 28,768
Purchases of real estate (5,721) (14,700)
Purchases of other property, plant and equipment (363,967) (349,729)
Net cash used in investing activities (378,467) (364,926)
Cash flows from financing activities:    
Proceeds from employee equity awards 27,593 25,847
Payment of dividends and special distribution (204,603) (186,999)
Proceeds from public offering of common stock, net of issuance costs 1,213,434 0
Proceeds from senior notes 0 929,850
Repayments of finance lease liabilities (31,158)  
Repayments of finance lease liabilities   (55,787)
Repayments of mortgage and loans payable (18,334) (6,599)
Debt extinguishment costs 0 (20,704)
Debt issuance costs 0 (11,583)
Net cash provided by financing activities 986,932 674,025
Effect of foreign currency exchange rates on cash, cash equivalents and restricted cash (1,695) 7,903
Net increase in cash, cash equivalents and restricted cash 1,027,911 617,909
Cash, cash equivalents and restricted cash at beginning of period 627,604 1,450,701
Cash, cash equivalents and restricted cash at end of period 1,655,515 2,068,610
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statement of cash flows $ 627,604 $ 1,450,701