Earnings Per Share - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 56,239	$ 59,517
Average common shares outstanding:
Average common shares outstanding - basic (in shares)	31,187	30,614
Additional shares for stock-based compensation plans	25	19
Average common shares outstanding - diluted (in shares)	31,212	30,633
Earnings (loss) per share of common stock
Basic (in dollars per share)	$ 1.80	$ 1.94
Diluted (in dollars per share)	$ 1.80	$ 1.94
Antidilutive shares	5	12