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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net income $ 285,038 $ 299,751
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 75,951 67,344
Gain on disposal of property and equipment (4,345) (1,205)
Other, net 8,390 8,115
Changes in operating assets and liabilities, net 50,333 14,720
Net cash provided by operating activities 415,367 388,725
Cash flows from investing activities:    
Purchase of property and equipment (234,736) (93,713)
Proceeds from sale of property and equipment 10,283 10,455
Purchase of short-term investments   (75,162)
Proceeds from maturities of short-term investments 24,578 49,966
Net cash used in investing activities (199,875) (108,454)
Cash flows from financing activities:    
Payments for share repurchases (141,666) (338,352)
Forward contract for accelerated share repurchases   (100,000)
Dividends paid (44,052) (34,196)
Other financing activities, net (8,462) (8,165)
Net cash used in financing activities (194,180) (480,713)
Increase (decrease) in cash and cash equivalents 21,312 (200,442)
Cash and cash equivalents at beginning of period 186,312 462,564
Cash and cash equivalents at end of period $ 207,624 $ 262,122