DEBT (Convertible Subordinated Notes) (Details)	6 Months Ended
	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($)
Zero Coupon Convertible Subordinated Notes [Line Items]
Payments on zero-coupon subordinated notes	$ 0	$ (15,900,000)
Zero-coupon convertible subordinated notes [Member]
Zero Coupon Convertible Subordinated Notes [Line Items]
Minimum contingent cash interest rate on zero-coupon subordinated notes (in hundredths)	0.125%
Number of trading days used to establish contingent cash interest rate on zero-coupon subordinated notes (in days)	5
Stock conversion rate for zero-coupon subordinated notes (per thousand) | shares	13.4108
Principal amount of zero-coupon subordinated notes	$ 1,000
Date of the terms for the zero-coupon subordinated notes and indenture	Oct. 24, 2006