INTEREST EXPENSE (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Expense [Abstract]
Long-term debt and lease obligations	$ 84,604	$ 81,203	$ 85,543
Short-term debt	8,654	23,084	17,051
Capitalized interest	(1,744)	(5,778)	(7,814)
Interest expense, gross	91,514	98,509	94,780
Interest income	(3,158)	(2,940)	(2,597)
Interest expense, net	$ 88,356	$ 95,569	$ 92,183