DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017	Mar. 31, 2012 USD ($) derivative_instrument
Derivative [Line Items]
Total exposure to floating rate interest rates	1.00%		1.00%		1.00%
Gain on extinguishment of debt			$ (2,900,000)	$ 0
Foreign Exchange Contract
Derivative [Line Items]
Notional amounts of foreign currency exchange contracts	$ 133,000,000		133,000,000
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	2,000,000	$ 500,000	(1,100,000)	2,800,000
Intercompany Loans
Derivative [Line Items]
Gain (loss) due to the effect of foreign currency exchange rates on intercompany loans	1,500,000	900,000	(2,200,000)	4,700,000
March 2012 Interest-Rate Swap Termination
Derivative [Line Items]
Number of interest-rate swap agreements terminated | derivative_instrument						2
Notional amount						$ 350,000,000
Deferred gain (loss) on discontinuation of interest rate fair value hedge						$ 46,100,000
Amortization of interest rate swap gains	$ 0	$ 1,200,000	6,000,000	$ 3,600,000
Gain on extinguishment of debt			$ 3,600,000