INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 49,911	$ 76,178	$ 69,102
State	13,602	13,406	12,949
Foreign	7,929	7,158	14,464
Total current tax	71,442	96,742	96,515
Deferred:
Federal	6,091	17,249	(5,991)
State	1,957	1,610	2,892
Foreign	(420)	(223)	(149)
Total deferred tax	7,628	18,636	(3,248)
TOTAL PROVISION FOR INCOME TAXES	79,070	115,378	93,267
Reconciliation of primary factors causing income tax expense to be different than the federal statutory rate
Income tax at statutory rate	65,254	103,075	91,222
State income tax expense (net of federal benefit)	12,984	9,979	8,876
Foreign tax expense/(benefit)	1,186	(1,613)	9,857
Foreign tax	(234)	(221)	(19,155)
Repatriation tax under TCJA	1,233	7,956	0
Other	(1,353)	(3,798)	2,467
TOTAL PROVISION FOR INCOME TAXES	$ 79,070	$ 115,378	$ 93,267
Effective income tax rate	25.40%	39.20%	35.80%
Income taxes paid net of refunds	$ 77,351	$ 90,702	$ 88,766