NET EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings (Numerator) [Abstract]
Net Earnings - Basic and Diluted	$ 24,949	$ 25,013	$ 22,731	$ 23,411	$ 22,162	$ 21,568	$ 21,125	$ 19,768	$ 96,104	$ 84,623	$ 79,671
Number of Shares (Denominator) [Abstract]
Weighted average common shares - basic (in shares)									32,215,000	32,176,000	32,136,000
Effect of dilutive securities - stock options, restricted stock, and performance shares (in shares)									457,000	327,000	369,000
Weighted average common shares - diluted (in shares)									32,672,000	32,503,000	32,505,000
Per Share Amount [Abstract]
Net earnings per share - basic (in dollars per share)	$ 0.78	$ 0.78	$ 0.71	$ 0.73	$ 0.69	$ 0.67	$ 0.66	$ 0.62	$ 2.98	$ 2.63	$ 2.48
Net earnings per share - diluted (in dollars per share)	$ 0.76	$ 0.77	$ 0.70	$ 0.72	$ 0.68	$ 0.66	$ 0.65	$ 0.61	2.94	$ 2.60	$ 2.45
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Award participation per share of common stock									$ 1
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding, excluded from diluted earnings per share calculation (in shares)									155,294	204,672	12,250