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Debt And Credit Arrangements Senior Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Financing costs amortization $ 1,306 $ 1,530 $ 4,383
Fronting Fee Percentage Charged For Issuance Of Letters Of Credit 0.125%    
Senior Credit Facility [Member]
      
Debt Instrument [Line Items]      
Term of Restated Credit Facility five    
Line of Credit Facility, Maximum Borrowing Capacity 375,000    
Line of Credit Facility, Covenant Terms Significant financial covenants for the Senior Credit Facility include a maximum net debt to EBITDA ratio of 3.25 and a minimum interest coverage to EBITDA ratio of 3.0, which are the same limits that applied under the Prior Credit Facility.    
Line of Credit Facility, Interest Rate Description Loans under the Senior Credit Facility 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 Restated Credit Facility) 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%, plus a margin that varies with the Company's net debt to EBITDA ratio.    
Debt Issuance Cost 1,445    
Line Of Credit Facility, Amount Of Expansion Option To Increase The Aggregate Principal Amount Of The Term Loan Or Revolving Credity Facility 150,000    
Line Of Credit Facility Initial Percentage Of Term Loan Payable Quarterly Due To Restated Credit Facility 5.00%    
Initial Duration Of Quarterly Payments On Term Loan Under The Terms Of The Restated Credit Facility 3 years    
Line Of Credit Facility Final Percentage Of Term Loan Payable Quarterly Due To Restated Credit Facility 10.00%    
Final Duration Of Quarterly Payments On Term Loan Under The Terms Of The Restated Credit Facility 2 years    
Senior Term Loan, Due 2015 [Member] | Prior Credit Facility [Member]
      
Debt Instrument [Line Items]      
Financing costs amortization     1,178
Term Loan [Member] | Senior Term Loan Due 2017 [Member]
      
Debt Instrument [Line Items]      
Long-term Debt, Gross 68,438 72,188  
Letters of Credit Outstanding, Amount 24,761    
Line of Credit Facility, Remaining Borrowing Capacity 275,239    
Senior Term Loan Due 2017 [Member] | Senior Credit Facility [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 75,000    
Long-term Debt, Weighted Average Interest Rate 2.54%    
Financing costs amortization 595 587  
Line of Credit [Member] | Senior Credit Facility [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 75,000    
Maximum Percentage Of Capital Stock Guaranteed By Company's Material Non-U.S. Subsidiaries For Obligations Under The Senior Credit Facility 65.00%    
Minimum [Member] | Line of Credit [Member] | Revolver [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Commitment Fee Percentage 0.25%    
Minimum [Member] | Revolving Line of Credit [Member] | Revolver [Member]
      
Debt Instrument [Line Items]      
Applicable Margin For Eurocurrency Revolving Facility Borrowings 1.50%    
Maximum [Member] | Line of Credit [Member] | Revolver [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Commitment Fee Percentage 0.40%    
Maximum [Member] | Revolving Line of Credit [Member] | Revolver [Member]
      
Debt Instrument [Line Items]      
Applicable Margin For Eurocurrency Revolving Facility Borrowings 3.00%    
Revolving Credit Facility [Member] | Senior Credit Facility [Member]
      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 300,000    
Sub-limit For Issuance Of Swingline Loans 25,000    
Sub-limit For Letters Of Credit 100,000    
Maximum Amount For Foreign Currency Denominated Letters Of Credit And Borrowings 50,000    
Maximum Amount Of Permitable Subsidiary Borrowings $ 50,000