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Debt and Credit Arrangements Senior Credit Facility and Senior Secured Revolving Credit Facility (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]          
Unamortized Debt Issuance Expense         $ 1,836
Financing costs amortization $ 321 $ 322 $ 963 $ 969  
Short-term Debt 6,739   $ 6,739   6,160
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Term of Senior Credit Facility     5 years    
Line of Credit Facility, Maximum Borrowing Capacity 450,000   $ 450,000    
Unamortized Debt Issuance Expense 2,869   2,869    
Financing costs amortization $ 143 145 $ 430 436  
Fronting Fee Percentage Charged For Issuance Of Letters Of Credit 0.125%   0.125%    
Line of Credit Facility, Interest Rate Description     Revolving loans under the SSRCF bear interest, at the applicable Borrower’s election, at either LIBOR or the greatest of (a) the JPMorgan prime rate in effect on such day, (b) the Federal Funds Effective Rate in effect on such day plus 1/2 of 1% or (c) the Adjusted LIBOR Rate (as defined in the SSRCF) for the relative interest period on such day (or if such day is not a business day, the immediately preceding business day) plus 1% (the “Adjusted Base Rate”), plus a margin that varies with the Company’s leverage ratio.    
Line of Credit Facility, Covenant Terms     Significant financial covenants for the SSRCF include a minimum liquidity requirement equal to the principal amount of the Convertible Notes outstanding six months prior to the maturity date of the Convertible Notes and when holders of the Convertible Notes have the option to require the Company to repurchase the Convertible 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 $100,000 or greater. The SSRCF contains a number of other customary covenants,including, but not limited to, restrictions on the Company’s 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.    
Debt Instrument, Covenant Compliance     At September 30, 2016, the Company was in compliance with all covenants.    
Letters of Credit Outstanding, Amount $ 34,867   $ 34,867    
Line of Credit Facility, Remaining Borrowing Capacity $ 415,133   $ 415,133    
Maximum Percentage Of Capital Stock Guaranteed By Company's Material Non-U.S. Subsidiaries For Obligations Under The Senior Credit Facility 65.00%   65.00%    
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility Sub-limit - Swingline [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000   $ 25,000    
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility Sub-limit - Letters of Credit [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 100,000   100,000    
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility Sub-limit - Foreign Currency [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 100,000   100,000    
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility Sub-limit - Foreign Borrower [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 100,000   100,000    
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility - Expansion Option [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 200,000   200,000    
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member]          
Debt Instrument [Line Items]          
Unamortized Debt Issuance Expense 1,303   1,303   $ 1,836
Financing costs amortization $ 178 $ 177 $ 533 $ 533  
Minimum [Member] | Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%    
Line of Credit Facility, Participation Fee Percentage     1.50%    
Maximum [Member] | Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.40%    
Line of Credit Facility, Participation Fee Percentage     2.75%