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Fair Values of Financial Instruments Schedule of Fair Values of Financial Instruments (Details)
In Thousands, unless otherwise specified
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2010
EUR Denominated Term Loan [Member]
USD ($)
Dec. 31, 2010
EUR Denominated Term Loan [Member]
EUR (€)
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2011
2011 Senior Secured Credit Facility [Member]
USD ($)
Dec. 31, 2010
2011 Senior Secured Credit Facility [Member]
USD ($)
Dec. 31, 2011
2011 Senior Secured Credit Facility [Member]
USD Denominated Term Loan [Member]
USD ($)
Dec. 31, 2010
2011 Senior Secured Credit Facility [Member]
USD Denominated Term Loan [Member]
USD ($)
Dec. 31, 2011
2007 Senior Secured Credit Facility [Member]
USD Denominated Term Loan [Member]
USD ($)
Dec. 31, 2010
2007 Senior Secured Credit Facility [Member]
USD Denominated Term Loan [Member]
USD ($)
Dec. 31, 2011
2007 Senior Secured Credit Facility [Member]
EUR Denominated Term Loan [Member]
USD ($)
Dec. 31, 2010
2007 Senior Secured Credit Facility [Member]
EUR Denominated Term Loan [Member]
USD ($)
Assets                                
Cash and cash equivalents $ 133,086 $ 169,477 $ 121,893 $ 144,390                        
Cash and cash equivalents, at fair value 133,086 169,477                            
Foreign exchange forwards, asset 241 63                            
Foreign exchange forwards, asset, at fair value             241 63                
Liabilities                                
Term loans         174,000 132,400         292,502 0 0 218,642 0 174,031
Term loans, at fair value                     296,856 0 0 219,462 0 174,684
Multicurrency revolving line of credit                 160,000 0            
Multicurrency revolving line of credit, Fair Value of Amount Outstanding                 163,269 0            
Convertible senior subordinated notes 0 218,268                            
Convertible senior subordinated notes at fair value 0 236,461                            
Interest rate swaps 0 6,820                            
Interest rate swaps, at fair value             0 6,820                
Foreign exchange forwards, liability 222 457                            
Foreign exchange forwards, liability, at fair value             $ 222 $ 457