DEBT (Convertible Subordinated Notes) (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 USD ($)
Zero Coupon Convertible Subordinated Notes [Line Items]
Number of trading days used to establish contingent cash interest rate on zero-coupon subordinated notes (in days)	five
Stock conversion rate for zero-coupon subordinated notes (per thousand) | shares	200,000
tax benefit realized upon conversion of zero coupon convertible debt	$ 12,800,000
Principal amount of zero-coupon subordinated notes	20,000,000
Debt Conversion, Converted Instrument, Amount	62,100,000
Payments On Zero Coupon Subordinated Notes	$ 30,800,000	$ 0
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%
Stock conversion rate for zero-coupon subordinated notes (per thousand) | shares	13.4108
Principal amount of zero-coupon subordinated notes	$ 1,000