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)
Proceeds from Issuance of Common Stock	0
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, 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
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]
Treasury Stock, Value, Acquired, Cost Method	$ (100,005)			$ (100,005)