INCOME TAXES (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal									$ 65,571	$ 13,324	$ 19,851
State									(204)	(63)	2,563
Foreign									23,617	17,243	14,528
Deferred
Federal									7,235	(3,581)	(13,361)
State									(90)	312	(1,891)
Foreign									5,416	(35)	(76)
Total	$ 82,951	$ 7,953	$ 5,687	$ 4,954	$ 7,287	$ 7,067	$ 6,493	$ 6,353	$ 101,545	$ 27,200	$ 21,614