Annual report pursuant to Section 13 and 15(d)

Derivative Instruments And Hedging Activities (Details Textual)

v2.4.0.6
Derivative Instruments And Hedging Activities (Details Textual) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Aug. 31, 2009
Agreement
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2010
Aug. 31, 2009
Maximum [Member]
Aug. 31, 2009
Minimum [Member]
Dec. 31, 2011
Foreign exchange currency contracts [Member]
Dec. 31, 2010
Foreign exchange currency contracts [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Dec. 31, 2010
Interest Rate Swap [Member]
Dec. 31, 2009
Interest Rate Swap [Member]
Dec. 31, 2011
Freestanding Derivatives [Member]
Dec. 31, 2010
Freestanding Derivatives [Member]
Additional Derivative Instruments and Hedging Activities (Textual) [Abstract]                          
Maximum duration of hedging of interest rate swap derivative exposure   1 year 7 months                      
Maximum duration of hedging of interest rate swap derivative     4 years                    
Number of interest rate swap agreements 4                        
Interest rate swap agreements, Aggregate Notional Amounts     $ 140.0                    
Average effective fixed rate on notional balances of debt and interest rate swap, minimum     4.28%                    
Average effective fixed rate on notional balances of debt and interest rate swap, maximum     5.28%                    
Derivative Instruments and Hedging Activities (Textual) [Abstract]                          
Effective date of interest rate swap agreements                     Dec. 31, 2009    
Weighted average fixed interest rate on notional amounts                 2.78% 2.78% 2.78%    
Outstanding Notional Amount of Foreign Currency Forward Contract   318.8   367.7     64.4 32.1          
Derivative Higher Remaining Maturity Range             Next 15 Months            
Interest on New Credit Facility         LIBOR + 2.50% LIBOR + 1.50%              
Interest rate applicable on interest rate swap agreements for stipulated period                     1 month LIBOR Rate    
Expiration date of interest rate swap agreements                 Jun. 01, 2013 Jun. 01, 2013 Jul. 01, 2013    
Average Remaining Maturity of Foreign Currency Derivative   Less than fifteen months   Less than twelve months               within 1 month within 3 months
Liabilities related to Interest rate swaps at fair value                 5.1 6.6      
Fair Value of outstanding foreign currency forward contracts             $ 4.4 $ 0.6