Condensed Consolidated Statement of Shareholders' Equity Statement - USD ($) shares in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Common Stock, Shares, Outstanding		282,912
Stockholders' Equity, Other		$ 1,985,698,000	$ 283,000		$ 1,997,207,000	$ (11,792,000)
Stockholders' Equity, Other		$ 1,930,940,000			1,945,646,000	(14,985,000)
Common Stock, Shares, Outstanding			281,438
Common Stock, Shares, Outstanding		278,664
Stockholders' Equity, Other		$ 1,755,414,000	$ 279,000		1,766,471,000	(11,336,000)
Stockholders' Equity, Other		1,662,747,000	$ 279,000		1,672,938,000	(10,470,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		459,928,000			459,928,000
Other Comprehensive Income (Loss), Net of Tax		4,515,000
Shares of common stock repurchased			(8,032)
Value of common stock repurchased		(437,047,000)	$ 0	$ 82,155,000	354,892,000	0
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			980
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		(23,026,000)	$ 0	(23,026,000)	0	0
Stock Issued During Period, Shares, Other			699
Stock Issued During Period, Value, Stock Options Exercised		18,986,000	$ 0	18,986,000	0	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition		65,035,000	$ 0	65,035,000	0	0
Modification Of Liability Instruments To Equity	[1]			3,471,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans			384
Stock Issued During Period, Value, Employee Stock Ownership Plan			$ 0
Stock Issued During Period, Value, Employee Stock Purchase Plan		17,689,000		17,689,000	0	0
Dividends		1.38
Dividends, Common Stock, Cash		$ (380,231,000)	$ 0	$ 0	(380,231,000)	$ 0
Common Stock, Shares, Outstanding			274,326
Common Stock, Shares, Outstanding		272,695
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 2,487,000			$ 2,487,000

[1] (1) In December 2018, $3.5 million was reclassified from accrued salaries to additional paid-in capital due to a settlement agreement relating to the expiration of stock options.