EMPLOYEE SAVINGS AND BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred compensation
Beginning of period balance	$ 30,928	$ 40,995	$ 10,875
Assumption of deferred compensation in Merger	0	0	27,057
Employee compensation deferrals	15	384	840
Employee compensation payments	(3,826)	(8,709)	(1,184)
Increase (decrease) in plan fair value	6,112	(1,742)	3,407
End of period balance	33,229	30,928	40,995
401(K) savings plan expense	$ 5,600	$ 6,100	$ 2,900