Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 1,053,230	$ 755,569
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	204,009	193,106
Gain on disposal of property and equipment	(2,584)	(179)
Deferred income taxes	20,705	9,193
Other, net	24,772	22,915
Changes in operating assets and liabilities, net	30,102	(107,989)
Net cash provided by operating activities	1,330,234	872,615
Cash flows from investing activities:
Purchase of property and equipment	(504,782)	(384,688)
Proceeds from sale of property and equipment	20,044	18,635
Purchase of short-term investments	(163,720)	(254,832)
Proceeds from maturities of short-term investments	259,623	360,203
Other investing activities, net		(500)
Net cash used in investing activities	(388,835)	(261,182)
Cash flows from financing activities:
Payments for share repurchases	(1,077,301)	(536,465)
Forward contract for accelerated share repurchases		(62,500)
Dividends paid	(101,440)	(69,387)
Other financing activities, net	(8,495)	(4,750)
Net cash used in financing activities	(1,187,236)	(673,102)
Decrease in cash and cash equivalents	(245,837)	(61,669)
Cash and cash equivalents at beginning of period	462,564	401,430
Cash and cash equivalents at end of period	$ 216,727	$ 339,761