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Fair Value Measurements (Details) (Recurring, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Level 1
    
Fair value measurements    
Cash equivalents $ 176,974 $ 187,327
Other current assets (marketable securities) 28 25
Total Assets 177,002 187,352
Level 2
    
Fair value measurements    
Total Assets 1,013 81,882
Total Liabilities (50,354) (2,388)
Level 2 | Other derivative agreements
    
Fair value measurements    
Other current assets 994 63,051
Other long-term assets 19 18,831
Other current liabilities (42,751)  
Other long-term liabilities (5,211)  
Level 2 | Interest rate swap
    
Fair value measurements    
Other current liabilities (965) (905)
Other long-term liabilities (1,427) (1,483)
Total
    
Fair value measurements    
Cash equivalents 176,974 187,327
Other current assets (marketable securities) 28 25
Total Assets 178,015 269,234
Total Liabilities (50,354) (2,388)
Total | Other derivative agreements
    
Fair value measurements    
Other current assets 994 63,051
Other long-term assets 19 18,831
Other current liabilities (42,751)  
Other long-term liabilities (5,211)  
Total | Interest rate swap
    
Fair value measurements    
Other current liabilities (965) (905)
Other long-term liabilities $ (1,427) $ (1,483)