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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 |
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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