INCOME TAXES (Components for Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal									$ 36,167	$ 41,453	$ 32,198
State									5,140	3,518	3,682
Foreign									708	295	76
Total current									42,015	45,266	35,956
Deferred:
Federal									6,576	(7,917)	12,586
State									(2,582)	4,695	3,014
Foreign									(328)	319	35
Total deferred									3,666	(2,903)	15,635
Income tax expense	$ 26,060	$ 14,247	$ 1,863	$ 3,511	$ 4,487	$ 20,990	$ 3,611	$ 13,275	$ 45,681	$ 42,363	$ 51,591