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Fair Value Measurements (Details) (Recurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Level 1
    
Fair value measurements    
Cash equivalents $ 187,327 $ 70,052
Other current assets (marketable securities) 25 26
Total Assets 187,352 70,078
Level 2
    
Fair value measurements    
Total Assets 81,882  
Total Liabilities (2,388) (4,043)
Level 2 | Other derivative agreements
    
Fair value measurements    
Other current assets 63,051  
Other long-term assets 18,831  
Other current liabilities   (4,043)
Level 2 | Interest rate swap
    
Fair value measurements    
Other current liabilities (905)  
Other long-term liabilities (1,483)  
Total
    
Fair value measurements    
Cash equivalents 187,237 70,052
Other current assets (marketable securities) 25 26
Total Assets 269,234 70,078
Total Liabilities (2,388) (4,043)
Total | Other derivative agreements
    
Fair value measurements    
Other current assets 63,051  
Other long-term assets 18,831  
Other current liabilities   (4,043)
Total | Interest rate swap
    
Fair value measurements    
Other current liabilities (905)  
Other long-term liabilities $ (1,483)