Earnings per Share Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 118,001	$ 136,838	$ 221,067	$ 228,677
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Weighted Average Number of Shares Outstanding, Basic	27,792	28,041	27,698	28,231
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Stock Options	516	246	451	287
Deferred Compensation Awards	316	303	320	308
Diluted Weighted Average Number of Shares Outstanding	28,624	28,590	28,469	28,826
Earnings Per Share, Basic	$ 4.25	$ 4.88	$ 7.98	$ 8.10
Earnings Per Share, Diluted	$ 4.12	$ 4.79	$ 7.77	$ 7.93
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share	0	908	8	784