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Fair Value Measurements (Details) (Recurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Level 1
    
Fair value measurements    
Cash equivalents $ 133,897 $ 187,327
Other current assets (marketable securities) 38 25
Total Assets 133,935 187,352
Level 2
    
Fair value measurements    
Total Assets 938 81,882
Total Liabilities (70,498) (2,388)
Level 2 | Other derivative agreements
    
Fair value measurements    
Other current assets   63,051
Other long-term assets 938 18,831
Other current liabilities (67,747)  
Level 2 | Interest rate swap
    
Fair value measurements    
Other current liabilities (861) (905)
Other long-term liabilities (1,890) (1,483)
Total
    
Fair value measurements    
Cash equivalents 133,897 187,327
Other current assets (marketable securities) 38 25
Total Assets 134,873 269,234
Total Liabilities (70,498) (2,388)
Total | Other derivative agreements
    
Fair value measurements    
Other current assets   63,051
Other long-term assets 938 18,831
Other current liabilities (67,747)  
Total | Interest rate swap
    
Fair value measurements    
Other current liabilities (861) (905)
Other long-term liabilities $ (1,890) $ (1,483)