Earnings per Share Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 136,838	$ 107,607	$ 228,677	$ 192,473
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Weighted Average Number of Shares Outstanding, Basic	28,041	29,271	28,231	29,144
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Stock Options	246	512	287	487
Deferred Compensation Awards	303	310	308	304
Diluted Weighted Average Number of Shares Outstanding	28,590	30,093	28,826	29,935
Earnings Per Share, Basic	$ 4.88	$ 3.68	$ 8.10	$ 6.60
Earnings Per Share, Diluted	$ 4.79	$ 3.58	$ 7.93	$ 6.43
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share	908	6	784	3