Shareholders' Equity-Common Stock Rollforward (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Preferred Stock, Shares Authorized	2,000,000
Stock Repurchase Program, Authorized Amount	$ 2,400,000
Stock Repurchase Program, Dollar Value of Shares Repurchased	1,636,532
Stock Repurchase Program, Remaining Authorized Repurchase Amount	763,468
Shares Approved December 2018 Member [Member]
Stock Repurchase Program, Authorized Amount	600,000
Stock Repurchase Program, Dollar Value of Shares Repurchased	600,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	0
Shares Approved July 2020 Member [Member]
Stock Repurchase Program, Authorized Amount	600,000
Stock Repurchase Program, Dollar Value of Shares Repurchased	600,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	0
Shares Approved December 2021
Stock Repurchase Program, Authorized Amount	600,000
Stock Repurchase Program, Dollar Value of Shares Repurchased	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	600,000
Shares Approved July 2021
Stock Repurchase Program, Authorized Amount	600,000
Stock Repurchase Program, Dollar Value of Shares Repurchased	436,532
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 163,468
Common Stock Issued [Member]
Common stock outstanding, Beginning balance	125,424	125,424	125,424
Shares issued for stock-based compensation awards	0	0	0
Repurchases of common stock	0	0	0
Common stock outstanding, Ending balance	125,424	125,424	125,424
Treasury Stock
Common stock outstanding, Beginning balance	50,581	44,804	40,233
Shares issued for stock-based compensation awards	1,056	764	886
Repurchases of common stock	(7,833)	(6,541)	(5,457)
Common stock outstanding, Ending balance	57,358	50,581	44,804
Common Stock at Par Value
Common stock outstanding, Beginning balance	74,843	80,620	85,191
Shares issued for stock-based compensation awards	1,056	764	886
Repurchases of common stock	(7,833)	(6,541)	(5,457)
Common stock outstanding, Ending balance	68,066	74,843	80,620

Stock Repurchase Program, Dollar Value of Shares Repurchased

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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