Consolidated Statements Of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total [Member]	Common Stock Including Additional Paid in Capital
Balance at Dec. 31, 2018		$ (17,089,789)	$ (2,811)	$ (1,385,474)	$ 15,707,126
Stock Issued During Period, Value, Employee Stock Purchase Plan					13,152
Net income	$ 612,299	612,299
Other Comprehensive Income (Loss), Net of Tax	190		190
Stock-based compensation					52,316
Repurchase of common stock					782,583
Balance at Dec. 31, 2019		(16,477,490)	(2,621)	(1,490,100)	14,990,011
Stock Issued During Period, Value, Employee Stock Purchase Plan					12,577
Net income	814,888	814,888
Other Comprehensive Income (Loss), Net of Tax	(135)		(135)
Stock-based compensation					50,026
Repurchase of common stock					777,454
Balance at Dec. 31, 2020	(1,390,198)	(15,662,602)	(2,756)	(1,390,198)	14,275,160
Stock Issued During Period, Value, Employee Stock Purchase Plan					12,404
Net income	784,830	784,830
Other Comprehensive Income (Loss), Net of Tax	(29)		(29)
Stock-based compensation					55,061
Repurchase of common stock					722,587
Balance at Dec. 31, 2021	$ (1,260,519)	$ (14,877,772)	$ (2,785)	$ (1,260,519)	$ 13,620,038