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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Earnings Per Share [Abstract] |  |  |  |  |  |
Net Income | $ 307,283 | $ 179,261 | $ 259,695 | $ 98,655 | $ 486,544 | $ 358,350
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic | (1,680) |  | 0 |  | (2,762) | 0
Net Income (Loss) Available to Common Stockholders, Basic | $ 305,603 |  | $ 259,695 |  | $ 483,782 | $ 358,350
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Anti-dilutive stock options excluded from diluted earnings per share computations (in shares) | 33 |  | 0 |  | 1 | 0
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights | 218 |  |  |  | 229 |
Weighted average shares outstanding: [Abstract] |  |  |  |  |  |
Basic (in shares) | 39,660 |  | 40,125 |  | 39,795 | 40,169
Effect of dilutive securities: [Abstract] |  |  |  |  |  |
Stock options and employee stock purchase plan (in shares) | 404 |  | 620 |  | 436 | 631
Diluted (in shares) | 40,064 |  | 40,745 |  | 40,231 | 40,800
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |
Basic (in dollars per share) | $ 7.71 |  | $ 6.47 |  | $ 12.16 | $ 8.92
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |
Diluted (in dollars per share) | $ 7.63 |  | $ 6.37 |  | $ 12.03 | $ 8.78

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