Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Number of outstanding units not included in computation of Diluted EPS (in shares)	1,093,000			78,000			715,000	78,000
Numerator:
Net income	$ 48,372	$ 53,951	$ 17,734	$ 9,684	$ 61,994	$ 35,900	$ 120,057	$ 107,578
Denominator:
Basic earnings per share weighted average shares	50,593,000			50,380,000			50,531,000	50,337,000
Dilutive effect of employee stock awards and warrants	43,000			345,000			105,000	389,000
Diluted earnings per share weighted average shares	50,636,000			50,725,000			50,636,000	50,726,000
Basic earnings per share (in dollars per share)	$ 0.96			$ 0.19			$ 2.38	$ 2.14
Diluted earnings per share (in dollars per share)	$ 0.96			$ 0.19			$ 2.37	$ 2.12
Performance shares
Number of outstanding units not included in computation of Diluted EPS (in shares)							334,000	230,000