Earnings Per Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	15.    Earnings Per Share The computation of earnings per share follows (in thousands, except per share data): H Net IncomeFor the Years Ended December 31, Net Income Shares Earnings per Share2021 Earnings $ 268,550 15,671 $ 17.14 Dilutive stock options - 221 Nonvested stock awards - 46 Diluted earnings $ 268,550 15,938 $ 16.85 2020 Earnings $ 319,466 15,955 $ 20.02 Dilutive stock options - 368 Nonvested stock awards - 75 Diluted earnings $ 319,466 16,398 $ 19.48 2019 Earnings $ 219,923 15,969 $ 13.77 Dilutive stock options - 480 Nonvested stock awards - 78 Diluted earnings $ 219,923 16,527 $ 13.31 During 2021, 617,000 stock options were excluded from the computation of diluted earnings per share as their exercise prices were greater than the average market price during most of the year. During 2020, 566,000 stock options were also excluded. During 2019, 287,000 stock options were also excluded.