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Fair Value Measurements (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 314,180 $ 349,463 $ 344,184 $ 74,964
Short-term debt (116,167) (93,057)    
Long-term debt (581,297) (675,103)    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 314,180 349,463    
Short-term debt (116,167) (93,057)    
Long-term debt (581,297) (675,103)    
Estimate of Fair Value, Fair Value Disclosure [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 314,180 349,463    
Short-term debt (118,424) (98,042)    
Long-term debt $ (750,980) $ (783,080)