Earnings per Share Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 396,868	$ 239,874	$ 127,587
Basic Weighted Average Shares Outstanding	29,092	28,610	27,846
Stock option awards	468	298	412
Deferred Compensation Awards	320	244	217
Diluted Weighted Average Shares Outstanding	29,880	29,152	28,475
Earnings Per Share, Basic	$ 13.64	$ 8.38	$ 4.58
Earnings Per Share, Diluted	$ 13.28	$ 8.23	$ 4.48
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share	11	379	1