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Fair Value Measurements (Details) (Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Level 1
    
Fair value measurements    
Cash equivalents $ 173,844 $ 187,327
Other current assets (marketable securities) 36 25
Total Assets 173,880 187,352
Level 2
    
Fair value measurements    
Total Assets   81,882
Total Liabilities (118,775) (2,388)
Level 2 | Other derivative agreements
    
Fair value measurements    
Other current assets   63,051
Other long-term assets   18,831
Other current liabilities (107,028)  
Other long-term liabilities (8,733)  
Level 2 | Interest rate swap
    
Fair value measurements    
Other current liabilities (828) (905)
Other long-term liabilities (2,186) (1,483)
Total
    
Fair value measurements    
Cash equivalents 173,844 187,327
Other current assets (marketable securities) 36 25
Total Assets 173,880 269,234
Total Liabilities (118,775) (2,388)
Total | Other derivative agreements
    
Fair value measurements    
Other current assets   63,051
Other long-term assets   18,831
Other current liabilities (107,028)  
Other long-term liabilities (8,733)  
Total | Interest rate swap
    
Fair value measurements    
Other current liabilities (828) (905)
Other long-term liabilities $ (2,186) $ (1,483)