STOCK PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 19, 2023
Stock Plans
Common shares available for future grant under all plans (in shares)	2,192,720
Total stock-based compensation expense	$ 26,223	$ 25,276	$ 23,787
Tax benefit related to stock-based compensation recognized in the period	6,711	6,363	5,988
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units	$ 17,254
Weighted average period of recognition of unrecognized stock-based compensation expense (in months)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 3,684	3,086	2,983
Stock options
Stock Plans
Award expiration (in years)	10 years
Award vesting period (in years)	3 years
Aggregate intrinsic value of awards outstanding	$ 99,884
Aggregate intrinsic value of awards exercisable	82,057
Total intrinsic value of awards exercised	$ 35,414	$ 7,082	$ 20,442
Restricted Stock Units
Stock Plans
Remaining weighted average life of non-vested restricted awards (in years)	1 year 6 months
Performance Shares [Member]
Stock Plans
Award vesting period (in years)	3 years
Shares granted	45,643
Shares granted (in dollars per share)	$ 136.41
Remaining weighted average life of non-vested restricted awards (in years)	1 year 9 months 18 days
RSU and PSU
Stock Plans
Shares granted	130,831
Shares granted (in dollars per share)	$ 180.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	339,441	391,072
1995 Lincoln Stock Purchase Plan
Stock Plans
Maximum additional number of the Company's common shares that may be granted (in shares)	800,000
Shares purchased (in shares)	0	0	9,070,000
2015 Employee Plan
Stock Plans
Maximum additional number of the Company's common shares that may be granted (in shares)				2,025,000
2015 Employee Plan | Restricted Stock Units
Stock Plans
Shares granted	85,188
2015 Employee Plan | Performance Shares [Member]
Stock Plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	82,089
2015 Director Plan
Stock Plans
Maximum additional number of the Company's common shares that may be granted (in shares)				200,000
2005 Plan | RSU and PSU
Stock Plans
Deferred RSUs and PSUs (in shares)	28,564,000
Deferred RSUs (in shares)	87,604
Minimum | Restricted Stock Units
Stock Plans
Award vesting period (in years)	3 years
Maximum | 1995 Lincoln Stock Purchase Plan
Stock Plans
Dollar value of shares that each employee has the ability to purchase on the open market, on a commission-free basis annually under the plan	$ 10