DEBT (Narrative) (Details) (USD $)	1 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	1 Months Ended		6 Months Ended			6 Months Ended
	Jan. 31, 2013	Dec. 31, 2011	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013 Amended Line Of Credit	Jun. 30, 2013 Medium-term Notes	Jan. 31, 2013 Medium-term Notes	Jun. 30, 2013 Line of Credit	Dec. 31, 2012 Line of Credit	Jun. 30, 2012 Line of Credit	Jun. 30, 2013 Line of Credit Minimum	Jun. 30, 2013 Line of Credit Maximum
Debt Instrument [Line Items]
Amount of final principal payment	$ 10,000,000			$ 134,557,000				$ 140,444,000
Interest rate				5.60%		6.50%		6.30%	8.70%
Amount of bank credit facility		600,000,000					500,000,000			500,000,000
Facility Expiration date		Dec. 15, 2016					Mar. 12, 2018
Borrowing capacity description			Borrowing capacity fluctuates with the level of eligible accounts receivable and inventory and may be less than $500,000,000 at any point in time.
Line of credit interst rate			2.03%
Applicable margin for LIBOR based borrowing										1.75%			1.50%	2.00%
Borrowing capacity			235,507,000
Short-term line of credit			100,000,000	0	0					100,000,000	0	0
Letter of credit outstanding			$ 55,575,000