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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |
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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 |  |  |

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Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |