TREASURY STOCK (Treasury Stock Activity) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share Repurchases [Line Items]
Shares repurchased, value	$ 0	$ 83,463	$ 31,278
Shares repurchased, shares	0	1,909
2010 Authorization
Share Repurchases [Line Items]
Shares repurchased, value	0	45,893
Shares repurchased, shares	0	1,104
2016 Convertible Senior Notes
Share Repurchases [Line Items]
Shares repurchased, value	$ 0	$ 37,570
Shares repurchased, shares	0	805