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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2006
Debt Instrument [Line Items]      
Long-term debt $ 374,388 $ 423,646  
Less: current portion (1,263) (12)  
Long-term debt, net of current portion 373,125 423,634  
Convertible Debt [Member]
     
Debt Instrument [Line Items]      
Long-term debt 27,228 26,474  
Debt issued 28,437   180,000
Interest rate 2.25%    
Year of maturity 2026    
Private Placement, Notes [Member]
     
Debt Instrument [Line Items]      
Long-term debt 150,000 150,000  
Debt issued 150,000    
Interest rate 6.84%    
Maturity date Oct. 25, 2017    
Maturity date range, start 2013    
Maturity date range, end 2017    
Credit Agreement [Member]
     
Debt Instrument [Line Items]      
Long-term debt 187,000 237,000  
Interest rate at end of period 3.61% 3.55%  
Year of maturity 2015    
Various Notes and Mortgages [Member]
     
Debt Instrument [Line Items]      
Long-term debt $ 10,160 $ 10,172  
Interest rate at end of period 3.05% 3.04%  
Maturity date range, end 2021