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Debt And Credit Arrangements Senior Secured Revolving Credit Facility (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Amortization of Debt Issuance Costs | $ 1,279,000 | $ 1,284,000 | $ 1,290,000
Debt Instrument, Interest Rate, Stated Percentage | 2.00% |  |
Borrowings on revolving credit facilities | $ 302,200,000 | 3,800,000 | $ 68,800,000
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Term | 5 years |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 450,000,000 |  |
Long-term Debt, Gross |  | $ 0 |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Term | 5 years |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 450,000,000 |  |
Write off of Deferred Debt Issuance Cost | $ 200,000 |  |
Line of Credit Facility, Interest Rate Description | Revolving loans under the SSRCF bear interest, at the applicable Borrower’s election, at a rate per annum equal to either (i) the greatest of (a) the Prime Rate (as defined in the SSRCF) in effect on such day, (b) the NYFRB Rate (as defined in the SSRCF) in effect on such day plus 1/2 of 1.0% and (c) the Adjusted LIBOR (as defined in the SSRCF) for a one-month interest period on such day (or if such day is not a business day, the immediately preceding business day) plus 1.0% (the “Adjusted Base Rate”), plus a margin that varies with the Company’s leverage ratio, or (ii) the Adjusted LIBOR (as defined in the SSRCF) for the relevant interest period in effect for day, plus a margin that varies with our leverage ratio. |  |
Debt Instrument, Covenant Description | Significant financial covenants for the SSRCF include a minimum liquidity requirement equal to the principal amount of the 2018 Notes outstanding six months prior to the maturity date of the 2018 Notes and when holders of the 2018 Notes have the option to require us to repurchase the 2018 Notes, a maximum leverage ratio of 3.25 and a minimum interest coverage to EBITDA ratio of 3.0. The required leverage ratio can be relaxed on up to two occasions, upon notification to the lenders, to 3.75 for up to four consecutive fiscal quarters, for acquisitions and plant expansions of $100.0 or greater. The SSRCF contains a number of other customary covenants including, but not limited to, restrictions on our ability to incur additional indebtedness, create liens or other encumbrances, sell assets, enter into sale and lease-back transactions, make certain payments, investments, loans, advances or guarantees, make acquisitions and engage in mergers or consolidations and pay dividends or distributions. At December 31, 2017, we were in compliance with all covenants. |  |
Debt Instrument, Covenant Compliance | At December 31, 2017, we were in compliance with all covenants. |  |
Debt Issuance Costs, Gross | $ 1,600,000 |  |
Unamortized Debt Issuance Expense | 2,400,000 |  |
Amortization of Debt Issuance Costs | 600,000 |  |
Long-term Debt, Gross | $ 239,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |
Borrowings on revolving credit facilities | $ 300.0 |  |
Interest Expense, Debt | 2,700,000 |  |
Letters of Credit Outstanding, Amount | 42,900,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 168,100,000 |  |
Maximum Percentage Of Capital Stock Guaranteed By Company's Material Non-U.S. Subsidiaries For Obligations Under The Senior Credit Facility | 65.00% |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |  |
Line of Credit, Participation Fee Percentage | 1.50% |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.375% |  |
Line of Credit, Participation Fee Percentage | 2.50% |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility Sub-limit - Swingline [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 25,000,000 |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility Sub-limit - Letters of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000,000 |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility Sub-limit - Foreign Currency [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000,000 |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility Sub-limit - Foreign Borrower [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000,000 |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility Sub-limit - Expansion Option [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 225,000,000 |  |
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility, due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fronting Fee Percentage Charged For Issuance Of Letters Of Credit | 0.125% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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