Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income	$ 179,261	$ 98,655
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	(1,051)	0
Net Income (Loss) Available to Common Stockholders, Basic	$ 178,210	$ 98,655
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)	1	0
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights	239
Weighted average shares outstanding: [Abstract]
Basic (in shares)	39,932	40,215
Effect of dilutive securities: [Abstract]
Stock options and employee stock purchase plan (in shares)	460	631
Diluted (in shares)	40,392	40,846
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 4.46	$ 2.45
Diluted (in dollars per share)	$ 4.41	$ 2.42