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Financial Instruments and Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Interest Rate Swap [Member]
Jun. 30, 2011
Interest Rate Swap [Member]
Jun. 30, 2012
Interest Rate Swap [Member]
Jun. 30, 2011
Interest Rate Swap [Member]
Jun. 30, 2012
Period From June 2012 Through December 2012 [Member]
Jun. 30, 2012
Period From January 2013 Through December 2013 [Member]
Jun. 30, 2012
Senior Notes [Member]
Dec. 31, 2011
Senior Notes [Member]
Oct. 04, 2010
Senior Notes [Member]
Secured Long-term Debt, Noncurrent                           $ 175,000
Long-term Debt, Fair Value                       186,048 179,156  
Notional Amount of Foreign Currency Derivatives 25,244   25,244                      
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net 1,435 746 558 2,654                    
Notional Amount of Cash Flow Hedge Instruments 0   0             27,500 36,500      
Notional Amount of Price Risk Cash Flow Hedge Derivatives 3,250   3,250   6,500                  
Notional Amount of Interest Rate Fair Value Hedge Derivatives 45,000   45,000                      
Debt Instrument, Interest Rate, Stated Percentage                       9.50%   9.50%
Derivative, Variable Interest Rate 7.20%   7.20%                      
Derivative, Fixed Interest Rate 9.50%   9.50%                      
Increase Decrease In Derivative Interest Expenses           168 175 393 380          
Amortization of Debt Discount (Premium)                       $ 3,558 $ 3,807