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Debt and Credit Arrangements Senior Credit Facility (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Apr. 25, 2012
Debt Instrument [Line Items] |  |  |  |  |
Term of Restated Credit Facility |  |  |  |  | five-year
Debt Issuance Cost |  |  | $ 1,445,000 |  |
Financing costs amortization | 326,000 | 326,000 | 979,000 | 1,203,000 |
Fronting Fee Percentage Charged For Issuance Of Letters Of Credit | 0.125% |  | 0.125% |  |
Line Of Credit Facility Initial Percentage Of Term Loan Payable Quarterly Due To Restated Credit Facility | 5.00% |  | 5.00% |  |
Line Of Credit Facility Final Percentage Of Term Loan Payable Quarterly Due To Restated Credit Facility | 10.00% |  | 10.00% |  |
Final Duration Of Quarterly Payments On Term Loan Under The Terms Of The Restated Credit Facility |  |  | 2 years |  |
Senior Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 375,000,000
Line Of Credit Facility, Amount Of Expansion Option To Increase The Aggregate Principal Amount Of The Term Loan Or Revolving Credity Facility |  |  |  |  | 150,000,000
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. |  |  |  |
Initial Duration Of Quarterly Payments On Term Loan Under The Terms Of The Restated Credit Facility |  |  | 3 years |  |
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, Amount Outstanding | 0 |  | 0 |  |
Senior Term Loan Due 2017 [Member] | Senior Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 75,000,000
Financing costs amortization | 148,000 | 148,000 | 446,000 | 670,000 |
Term Loan [Member] | Senior Term Loan Due 2017 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 69,375,000 |  | 69,375,000 |  |
Line of Credit [Member] | Senior Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
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% |  |
Revolving Line of Credit [Member] | Amended Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | 24,638,000 |  | 24,638,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 241,814,000 |  | 241,814,000 |  |
Revolving Credit Facility [Member] | Senior Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 300,000,000
Sub-limit For Issuance Of Swingline Loans |  |  |  |  | 25,000,000
Sub-limit For Letters Of Credit |  |  |  |  | 100,000,000
Maximum Amount For Foreign Currency Denominated Letters Of Credit And Borrowings |  |  |  |  | 50,000,000
Maximum Amount Of Permitable Subsidiary Borrowings |  |  |  |  | 50,000,000
Line of Credit Facility, Amount Outstanding | 15,000,000 |  | 15,000,000 |  |
Short-term Debt, Weighted Average Interest Rate | 2.48% |  | 2.48% |  |
Swingline Loans Under Revolving Credit Facility [Member] | Senior Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Amount Outstanding | $ 18,548,000 |  | $ 18,548,000 |  |
Short-term Debt, Weighted Average Interest Rate | 4.50% |  | 4.50% |  |
Minimum [Member] | Revolving Line of Credit [Member] | Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Applicable Margin For Eurocurrency Revolving Facility Borrowings | 1.50% |  | 1.50% |  |
Minimum [Member] | Line of Credit [Member] | Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.25% |  |
Maximum [Member] | Revolving Line of Credit [Member] | Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Applicable Margin For Eurocurrency Revolving Facility Borrowings | 3.00% |  | 3.00% |  |
Maximum [Member] | Line of Credit [Member] | Revolver [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.40% |  |

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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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