Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Total Stockholders' Equity at Dec. 31, 2018	$ 4,020,331	$ 3	$ 394,342	$ (49,129)	$ 3,722,073	$ (46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	865,195				865,195
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(34,007)					(34,007)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,505		8,505
Treasury Stock Reissued at Lower than Repurchase Price	3,831			5,398	(1,567)
Total Stockholders' Equity at Mar. 31, 2019	4,863,855	3	402,847	(43,731)	4,585,701	(80,965)
Total Stockholders' Equity at Dec. 31, 2018	4,020,331	3	394,342	(49,129)	3,722,073	(46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	1,464,005
Proceeds from Issuance of Common Stock	3,912
Total Stockholders' Equity at Jun. 30, 2019	5,486,810	3	410,601	(58,732)	5,184,511	(49,573)
Total Stockholders' Equity at Mar. 31, 2019	4,863,855	3	402,847	(43,731)	4,585,701	(80,965)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	598,810				598,810
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	31,392					31,392
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	7,818		7,818
Proceeds from Issuance of Common Stock	(64)		(64)
Treasury Stock, Value, Acquired, Cost Method	(15,001)			(15,001)
Total Stockholders' Equity at Jun. 30, 2019	5,486,810	3	410,601	(58,732)	5,184,511	(49,573)
Total Stockholders' Equity at Dec. 31, 2019	5,755,057	3	410,020	(38,397)	5,470,779	(87,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	685,912				685,912
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(61,607)					(61,607)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	9,654		9,654
Proceeds from Issuance of Common Stock	4,068		4,068
Treasury Stock, Value, Acquired, Cost Method	(100,005)			(100,005)
Total Stockholders' Equity at Mar. 31, 2020	6,293,079	3	423,742	(138,402)	6,156,691	(148,955)
Total Stockholders' Equity at Dec. 31, 2019	5,755,057	3	410,020	(38,397)	5,470,779	(87,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	1,652,341
Proceeds from Issuance of Common Stock	8,202
Total Stockholders' Equity at Jun. 30, 2020	7,353,402	3	429,485	(138,037)	7,123,093	(61,142)
Total Stockholders' Equity at Mar. 31, 2020	6,293,079	3	423,742	(138,402)	6,156,691	(148,955)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	966,429				966,429
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	87,813					87,813
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,878		8,878
Proceeds from Issuance of Common Stock	(2,797)		(2,797)
Treasury Stock Reissued at Lower than Repurchase Price			(338)	365	(27)
Total Stockholders' Equity at Jun. 30, 2020	$ 7,353,402	$ 3	$ 429,485	$ (138,037)	$ 7,123,093	$ (61,142)