IMPAIRMENT LOSSES AND RESTRUCTURING CHARGES (Textuals) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Enid, Oklahoma [Member]	Mar. 31, 2013 Domestic [Member]	Mar. 31, 2012 Domestic [Member] facility
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets	$ 0	$ 3,086				$ 3,086
Number of facilities impaired						2
Number of facilities, secured with new business						1
Assets held for sale	4,969		4,102	867
Restructuring Reserve					456
Facility Related Costs Paid					$ 9,633