INCOME TAXES (TAX RATE RECONCILIATION TABLE) (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
Effective tax rate reconciliation
Income tax per U.S. federal statutory rate (35%)									$ 31,110	$ 17,605	$ 30,062
State income taxes, net of federal deduction									460	(158)	1,603
Change in valuation allowances									(924)	(129)	3,923
Foreign income taxes at different rates than the U.S.									(14,417)	(10,206)	(14,490)
Foreign withholding taxes									323	590	958
Losses in international markets without tax benefits									1,098	2,474	1,999
Nondeductible compensation under Section 162(m)									647	104	512
Liabilities for uncertain tax positions									1,607	(133)	1,756
Permanent difference related to foreign exchange gains									142	388	162
(Income)/losses of foreign branch operations									(824)	(635)	(517)
Non-taxable earnings of minority interest									(1,030)	(1,128)	(1,349)
Foreign dividend less foreign tax credits									(4,798)	(4,646)	(4,425)
Increase in deferred tax liability - branch losses in UK											(2,530)
Decrease (increase) to deferred tax asset - change in state tax rate									1,101	443	(526)
State income tax credits									(207)	(100)	1,477
Foreign earnings taxed currently in U.S.									3,143	3,673	2,839
Taxes related to prior year filings									(865)	2,554	344
Taxes related to US tax reform	$ 62,400								61,569		0
Other									(474)	1,967	1,160
Income Tax Expense (Benefit), Total	$ 69,016	$ 2,071	$ 1,597	$ 5,391	$ 6,196	$ (813)	$ 2,952	$ 4,528	$ 78,075	$ 12,863	$ 20,004