INCOME TAXES (Components of Income (Loss) before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of income (loss) before income taxes
U.S.									$ 209,409	$ 118,037	$ 303,933
Non-U.S.									67,979	51,750	71,880
Income before income taxes	$ 78,152	$ 80,296	$ 45,758	$ 73,182	$ 71,172	$ (88,526)	$ 94,434	$ 92,707	$ 277,388	$ 169,787	$ 375,813