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Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Debt Instrument [Line Items]      
Total debt $ 450,383,000 $ 578,330,000 $ 407,908,000
Less current portion 22,606,000 43,617,000 35,939,000
Total long-term debt 427,777,000 534,713,000 371,969,000
Domestic And Multi-Currency Line Of Credit Up To $380,000 [Member]
     
Debt Instrument [Line Items]      
Total debt 179,321,000 301,011,000 156,113,000
Domestic And Multi-Currency Line Of Credit Up To $100,000 Due 2013 [Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity 100,000,000    
Debt instrument, maturity date May 29, 2013    
Domestic And Multi-Currency Line Of Credit Up To $280,000 Due 2015 [Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity 280,000,000    
6.00% Series A Senior Unsecured Notes Due 2019 [Member]
     
Debt Instrument [Line Items]      
Total debt 47,000,000 47,000,000 0
Debt instrument, maturity year 2019    
Debt instrument, interest rate 6.00%    
6.58% Series B Senior Unsecured Notes Due 2022 [Member]
     
Debt Instrument [Line Items]      
Total debt 5,000,000 5,000,000 0
Debt instrument, maturity year 2022    
Debt instrument, interest rate 6.58%    
6.21% Senior Unsecured Notes Due 2021 [Member]
     
Debt Instrument [Line Items]      
Total debt 20,455,000 20,455,000 22,727,000
Debt instrument, maturity year 2021    
Debt instrument, interest rate 6.21%    
6.09% Senior Unsecured Notes Due 2016 [Member]
     
Debt Instrument [Line Items]      
Total debt 28,000,000 28,000,000 35,000,000
Debt instrument, maturity year 2016    
Debt instrument, interest rate 6.09%    
6.12% Senior Unsecured Notes Due 2012 [Member]
     
Debt Instrument [Line Items]      
Total debt 0 0 13,333,000
Debt instrument, maturity year 2012    
Debt instrument, interest rate 6.12%    
7.26% Senior Unsecured Notes Due 2017 [Member]
     
Debt Instrument [Line Items]      
Total debt 20,000,000 25,000,000 25,000,000
Debt instrument, maturity year 2017    
Debt instrument, interest rate 7.26%    
Variable Rate Senior Unsecured Note Due 2015 [Member]
     
Debt Instrument [Line Items]      
Total debt 39,583,000 41,667,000 47,917,000
Debt instrument, maturity year 2015    
Debt instrument, maturity date Mar. 31, 2015    
5.25% Convertible Senior Unsecured Notes Due 2029 [Member]
     
Debt Instrument [Line Items]      
Total debt $ 111,024,000 $ 110,197,000 $ 107,818,000
Debt instrument, maturity year 2029    
Debt instrument, interest rate 5.25%