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Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands						1 Months Ended		2 Months Ended	3 Months Ended							9 Months Ended
	Aug. 13, 2021	May 17, 2021	May 14, 2021	May 04, 2021	Mar. 10, 2021	Jul. 31, 2021	Jan. 31, 2021	May 04, 2021	Sep. 30, 2021	Aug. 13, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Treasury Stock
Adjustment to additional paid in capital									$ 293,859							$ 293,859	$ 282,467
Common stock acquired, cost									192,506		$ 98,331	$ 63,348	$ 23,267	$ 8,311	$ 60,737
Accelerated Share Repurchase March 10, 2021
Treasury Stock
Stock price on initial delivery					$ 101.49
Number of repurchased shares delivered in initial delivery					276
Initial share delivery as a percentage of the number of shares initially underlying the ASR agreement					80.00%
Number of additional repurchased shares delivered at final settlement				46
Aggregate number of shares delivered								322
Final average cost per share								$ 108.76
Adjustment to additional paid in capital				$ 7,000	$ (7,000)			$ 7,000
Common stock acquired, cost				$ 7,000	28,000
Accelerated Share Repurchase March 10, 2021 | Maximum
Treasury Stock
Targeted repurchase of common stock					$ 35,000
Accelerated Share Repurchase May 14, 2021
Treasury Stock
Stock price on initial delivery		$ 95.63
Number of repurchased shares delivered in initial delivery		418
Initial share delivery as a percentage of the number of shares initially underlying the ASR agreement		80.00%
Number of additional repurchased shares delivered at final settlement	139
Aggregate number of shares delivered										558
Final average cost per share										$ 89.68
Adjustment to additional paid in capital	$ 10,000		$ (10,000)							$ 10,000
Common stock acquired, cost	$ 10,000		40,000
Accelerated Share Repurchase May 14, 2021 | Maximum
Treasury Stock
Targeted repurchase of common stock			$ 50,000
Common stock repurchase authorization
Treasury Stock
Increase in stock repurchase plan authorized						$ 970,000	$ 100,000
Authorized amount for repurchase of common stock						$ 1,470,000
Common stock acquired, shares																3,873
Common stock acquired, cost																$ 354,185
Remaining authorized repurchase amount									$ 864,085							$ 864,085

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Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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