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)	1,483,267	0	0	0	1,483,267	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(294,521)	0	0	0	294,521	0
Other Comprehensive Loss	(3,437)	0	0	(3,437)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	404	0	(7,074)	0	0	7,478
Restricted Stock and Restricted Stock Units, Net	0	5	384	0	0	(389)
Stock-Based Compensation Expenses	77,653	0	77,653	0	0	0
Treasury Stock Issued as Compensation	2,722	0	(439)	0	0	3,161
Cumulative Effect of Adoption of ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220)"	$ 0	0	0	267	(267)	0
Common Stock Dividends Declared (in dollars per share)	$ 0.5075
Balance	$ 19,903,797	205,807	5,695,197	(2,869)	14,050,676	(45,014)
Net Income (Loss)	847,841	0	0	0	847,841	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(166,908)	0	0	0	166,908	0
Other Comprehensive Loss	(1,659)	0	0	(1,659)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	6,193	0	(5,834)	0	0	12,027
Restricted Stock and Restricted Stock Units, Net	0	2	1,788	0	0	(1,790)
Stock-Based Compensation Expenses	38,566	0	38,566	0	0	0
Treasury Stock Issued as Compensation	$ 2,446	0	(399)	0	0	2,845
Common Stock Dividends Declared (in dollars per share)	$ 0.2875
Balance	$ 20,630,276	205,809	5,729,318	(4,528)	14,731,609	(31,932)
Balance	21,640,716	205,822	5,817,475	(4,652)	15,648,604	(26,533)
Net Income (Loss)	(899,571)	0	0	0	(899,571)	0
Common Stock Issued Under Stock Plans	(14)	0	(14)	0	0	0
Dividends, Common Stock	(436,540)	0	0	0	436,540	0
Other Comprehensive Loss	(1,478)	0	0	(1,478)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	3,662	0	(7,011)	0	0	10,673
Restricted Stock and Restricted Stock Units, Net	0	2	(3,415)	0	0	3,413
Stock-Based Compensation Expenses	79,643	0	79,643	0	0	0
Treasury Stock Issued as Compensation	$ 1,139	0	(380)	0	0	1,519
Common Stock Dividends Declared (in dollars per share)	$ 0.75
Balance	$ 21,470,675	205,824	5,852,821	(3,305)	15,440,142	(24,807)
Net Income (Loss)	(909,384)	0	0	0	(909,384)	0
Common Stock Issued Under Stock Plans	0	0	0	0	0	0
Dividends, Common Stock	(218,265)	0	0	0	218,265	0
Other Comprehensive Loss	(2,825)	0	0	(2,825)	0	0
Change in Treasury Stock - Stock Compensation Plans, Net	8,237	0	(6,635)	0	0	14,872
Restricted Stock and Restricted Stock Units, Net	0	0	541	0	0	(541)
Stock-Based Compensation Expenses	39,571	0	39,571	0	0	0
Treasury Stock Issued as Compensation	$ (452)	0	0	0	0	(452)
Common Stock Dividends Declared (in dollars per share)	$ 0.375
Balance	$ 20,387,557	$ 205,824	$ 5,886,298	$ (6,130)	$ 14,312,493	$ (10,928)