DEBT (Convertible Subordinated Notes) (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) shares	Jun. 30, 2019 USD ($) shares
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
Principal Amount At Maturity Of Zero Coupon Subordinated Notes Converted		$ 7,700,000
Value Of Cash And Common Stock In Connection With Conversions Of Zero Coupon Subordinated Notes Settled In Current Period		14,500,000
Payments On Zero Coupon Subordinated Notes		7,300,000
tax benefit realized upon conversion of zero coupon convertible debt		$ 1,700,000
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%
Stock conversion rate for zero-coupon subordinated notes (per thousand) | shares	13.4108	13.4108
Principal amount of zero-coupon subordinated notes	$ 1,000,000,000.0	$ 1,000,000,000.0