Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance	$ 19,364,188	$ 205,804	$ 5,658,794	$ (1,358)	$ 13,543,130	$ (42,182)
Net Income (Loss)	2,098,389	0	0	0	2,098,389	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(461,871)	0	0	0	461,871	0
Other Comprehensive Loss	(2,598)	0	0	(2,598)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(12,576)	0	(19,295)	0	0	6,719
Restricted Stock and Restricted Stock Units, Net	0	17	(1,886)	0	0	1,869
Stock-Based Compensation Expenses	132,323	0	132,323	0	0	0
Treasury Stock Issued as Compensation	$ 6,425	0	(863)	0	0	7,288
Common Stock Dividends Declared (in dollars per share)	$ 0.795
Cumulative Effect of Adoption of ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220)"	$ 0	0	0	267	(267)	0
Balance	20,630,276	205,809	5,729,318	(4,528)	14,731,609	(31,932)
Net Income (Loss)	615,122	0	0	0	615,122	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(167,350)	0	0	0	167,350	0
Other Comprehensive Loss	839	0	0	839	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(12,979)	0	(12,220)	0	0	(759)
Restricted Stock and Restricted Stock Units, Net	0	12	(2,270)	0	0	2,258
Stock-Based Compensation Expenses	54,670	0	54,670	0	0	0
Treasury Stock Issued as Compensation	$ 3,702	0	(425)	0	0	4,127
Common Stock Dividends Declared (in dollars per share)	$ 0.2875
Balance	$ 21,124,280	205,821	5,769,073	(3,689)	15,179,381	(26,306)
Balance	21,640,716	205,822	5,817,475	(4,652)	15,648,604	(26,533)
Net Income (Loss)	(942,038)	0	0	0	(942,038)	0
Common Stock Issued Under Stock Plans	(14)	0	(14)	0	0	0
Dividends, Common Stock	(655,369)	0	0	0	655,369	0
Other Comprehensive Loss	(3,278)	0	0	(3,278)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(6,294)	0	(7,203)	0	0	909
Restricted Stock and Restricted Stock Units, Net	0	15	(7,114)	0	0	7,099
Stock-Based Compensation Expenses	113,454	0	113,454	0	0	0
Treasury Stock Issued as Compensation	$ 1,149	0	(385)	0	0	1,534
Common Stock Dividends Declared (in dollars per share)	$ 1.125
Balance	$ 20,387,557	205,824	5,886,298	(6,130)	14,312,493	(10,928)
Net Income (Loss)	(42,467)	0	0	0	(42,467)	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(218,829)	0	0	0	218,829	0
Other Comprehensive Loss	(1,800)	0	0	(1,800)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	(9,956)	0	(192)	0	0	(9,764)
Restricted Stock and Restricted Stock Units, Net	0	13	(3,699)	0	0	3,686
Stock-Based Compensation Expenses	33,811	0	33,811	0	0	0
Treasury Stock Issued as Compensation	$ 10	0	(5)	0	0	15
Common Stock Dividends Declared (in dollars per share)	$ 0.375
Balance	$ 20,148,326	$ 205,837	$ 5,916,213	$ (7,930)	$ 14,051,197	$ (16,991)