Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, [Line Items]
Net income	$ 31,791	$ 32,079
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted average shares outstanding - basic	22,753	22,665
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average shares outstanding - diluted	23,093	23,069
Earnings Per Share, Basic [Abstract]
Earnings per share - basic	$ 1.40	$ 1.42
Earnings Per Share, Diluted [Abstract]
Earnings per share - diluted	$ 1.38	$ 1.39
Stock option [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Dilutive effect of shares issued under stock compensation arrangements	291	343
Restricted stock [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Dilutive effect of shares issued under stock compensation arrangements	49	61