Derivative Financial Instruments Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 | ||||
|---|---|---|---|---|---|---|
| Liability Derivatives [Abstract] | ||||||
| Current portion of debt | $ 15,000 | $ 228,721 | ||||
| Long-term debt | 481,252 | 382,220 | ||||
| Total liability derivatives | 342 | 181,308 | ||||
EUR Denominated Term Loan [Member] | Designated as Hedging Instrument [Member] | Current Portion of Debt [Member] | ||||||
| Liability Derivatives [Abstract] | ||||||
| Current portion of debt | 0 | [1] | 4,402 | [1] | ||
EUR Denominated Term Loan [Member] | Designated as Hedging Instrument [Member] | Long-term Debt [Member] | ||||||
| Liability Derivatives [Abstract] | ||||||
| Long-term debt | 0 | [1] | 169,629 | [1] | ||
Designated as Hedging Instrument [Member] | ||||||
| Liability Derivatives [Abstract] | ||||||
| Total liability derivatives | 0 | 180,851 | ||||
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | ||||||
| Liability Derivatives [Abstract] | ||||||
| Interest rate swap contracts | 0 | 5,845 | ||||
Designated as Hedging Instrument [Member] | Other Long Term Obligations [Member] | ||||||
| Liability Derivatives [Abstract] | ||||||
| Interest rate swap contracts | 0 | 975 | ||||
Other Current Assets [Member] | ||||||
| Asset Derivatives [Abstract] | ||||||
| Foreign exchange forward contracts asset | 175 | 63 | ||||
Other Current Liabilities [Member] | ||||||
| Liability Derivatives [Abstract] | ||||||
| Foreign exchange forward contracts liability | $ 342 | $ 457 | ||||
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