v3.21.2
Condensed Statements of Cash Flows (Unaudited) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 468,935,000 $ 280,982,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 127,942,000 131,170,000
Loss on disposal of property and equipment 701,000 140,000
Other, net 15,352,000 (9,118,000)
Changes in operating assets and liabilities, net (104,639,000) 113,042,000
Net cash provided by operating activities 508,291,000 516,216,000
Cash flows from investing activities:    
Purchase of property and equipment (206,109,000) (120,128,000)
Proceeds from sale of property and equipment 15,512,000 2,570,000
Purchase of short-term investments (89,965,000)  
Proceeds from maturities of short-term investments 255,072,000  
Net cash used in investing activities (25,490,000) (117,558,000)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt   99,923,000
Payments for share repurchases (280,215,000) (306,791,000)
Forward contract for accelerated share repurchases (68,750,000) (37,500,000)
Dividends paid (46,408,000) (35,892,000)
Other financing activities, net (4,654,000) (3,345,000)
Net cash used in financing activities (400,027,000) (283,605,000)
Increase in cash and cash equivalents 82,774,000 115,053,000
Cash and cash equivalents at beginning of period 401,430,000 403,571,000
Cash and cash equivalents at end of period $ 484,204,000 $ 518,624,000

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