INCOME TAXES (Components of Income (Loss) before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of income (loss) before income taxes
U.S.									$ 118,037	$ 303,933	$ 281,724
Non-U.S.									51,750	71,880	134,717
Income before income taxes	$ 71,172	$ (88,526)	$ 94,434	$ 92,707	$ 100,736	$ 77,785	$ 114,866	$ 82,426	$ 169,787	$ 375,813	$ 416,441