SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)					1 Months Ended	12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 21, 2016 shares	Dec. 15, 2016 shares	Oct. 25, 2016 $ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2018 USD ($) Customer Segment $ / shares shares	Dec. 31, 2017 USD ($) Customer $ / shares shares	Dec. 31, 2016 USD ($) Customer shares	Oct. 24, 2016 shares
Summary Of Significant Accounting Policies [Line Items]
Provision for doubtful accounts						$ 600,000	$ 2,000,000	$ 400,000
Inventory, capitalized expenses						0	0
Depreciation expense						44,100,000	36,100,000	31,200,000
Interest expense capitalized to property, plant, and equipment						$ 2,300,000	1,100,000
Number of reportable segments | Segment						2
Number of underlying reporting units | Segment						3
Charitable contributions						$ 800,000	500,000	0
Foreign currency transaction (loss) gain						$ 1,700,000	$ (2,900,000)	300,000
Common stock, shares authorized (in shares) | shares				240,000,000.0		240,000,000	240,000,000		60,000,000.0
Common stock, par value (in dollars per share) | $ / shares				$ 0.01		$ 0.01	$ 0.01
Stock split ratio, Common stock		2		2
Stock split, number of additional shares of common stock for each share held (in shares) | shares		1
Fractional shares issued (in shares) | shares		0
Pension contributions						$ 1,700,000	$ 500,000	0
Reclassification of stranded tax effect						(532,000)
Interest paid						58,300,000	32,300,000	57,200,000
Interest paid, capitalized into construction in progress						2,300,000	1,100,000	1,000,000
Payment of accreted interest						0	0	(42,786,000)
Stock issued during period, shares, conversion of convertible securities (in shares) | shares			2,900,000
Settlement of convertible notes								0
Treasury stock, cost					$ 123,100,000	120,600,000	121,600,000	123,100,000
Income taxes paid						10,400,000	14,600,000	4,300,000
Property and equipment purchases included in liabilities						$ 5,400,000	$ 7,800,000	$ 4,700,000
Convertible Debt
Summary Of Significant Accounting Policies [Line Items]
Stock issued, exercise of warrants (in shares) | shares							2,800,000
Warrants exercised (in shares) | shares							8,700,000
Accounting Standards Update 2016-02
Summary Of Significant Accounting Policies [Line Items]
Estimated impact of the new standard, increase in total assets, percentage						2.00%
Estimated impact of the new standard, increase in total liabilities, percentage						4.00%
Cumulative total payments over lease term						$ 67,000,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02
Summary Of Significant Accounting Policies [Line Items]
Reclassification of stranded tax effect	$ 500,000
Sales Revenue, Net
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, number of customers over benchmark | Customer						0	0	0
Concentration risk, percentage						10.00%	10.00%	10.00%
Common Stock
Summary Of Significant Accounting Policies [Line Items]
Stock issued during period, shares, conversion of convertible securities (in shares) | shares					2,900,000			2,946,000
Settlement of convertible notes					$ 122,000,000			$ 29,000
Stock issued, exercise of warrants (in shares) | shares							2,840,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Manufacturing period for products shipped with no alternative use and right of payment for performance						1 month
Maximum
Summary Of Significant Accounting Policies [Line Items]
Manufacturing period for products shipped with no alternative use and right of payment for performance						3 months