EMPLOYEE COMPENSATION PLANS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee compensation plans [Line Items]
401(k) contributions, maximum annual employee contribution, percent of wages		50.00%
401(k) expense		$ 10,176	$ 9,686	$ 9,023
Performance-based compensation plans	[1]	21,143	20,297	$ 22,085
Deferred compensation plan
Deferred compensation plan liability		5,036	4,458
Deferred compensation plan assets		$ 11,204	$ 10,831
Maximum [Member]
Deferred compensation plan
Maximum percentage of base salary employees can defer		100.00%
Maximum percentage of bonus employees can defer		50.00%
401(k) plan, first 1% of wages contributed by employee [Member]
Employee compensation plans [Line Items]
Employer matching 401(k) contribution, percentage		100.00%
401(k) plan, next 5% of wages contributed by employee [Member]
Employee compensation plans [Line Items]
Employer matching 401(k) contribution, percentage		50.00%
401(k) plan, 100% employer match [Member]
Employee compensation plans [Line Items]
Employee 401(k) contribution receiving employer match, percent of wages		1.00%
401(k) plan, 50% employer match [Member]
Employee compensation plans [Line Items]
Employee 401(k) contribution receiving employer match, percent of wages		5.00%

[1] Excludes expense for share-based compensation, which is discussed in Note 12.