Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	12,235	14,017	12,132	12,182
Net Income	$ 31,081	$ 24,986	$ 83,210	$ 60,728
Weighted average number of common shares outstanding (for basic calculation)	21,214,000	20,948,000	21,189,000	20,870,000
Dilutive securities	516,000	608,000	546,000	691,000
Diluted (in shares)	21,730,000	21,556,000	21,735,000	21,561,000
EPS - basic	$ 1.47	$ 1.19	$ 3.93	$ 2.91
Diluted (In dollars per share)	$ 1.43	$ 1.16	$ 3.83	$ 2.82