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External financing (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Jul. 02, 2011
Components of long-term debt    
Other long-term debt $ 37,425 $ 126,512
Subtotal 1,187,425 1,276,512
Discount on notes (2,737) (3,003)
Long-term debt 1,184,688 1,273,509
5.875% Notes due March 15, 2014 [Member]
   
Components of long-term debt    
Senior notes 300,000 300,000
6.00% Notes due September 1, 2015 [Member]
   
Components of long-term debt    
Senior notes 250,000 250,000
6.625% Notes due September 15, 2016 [Member]
   
Components of long-term debt    
Senior notes 300,000 300,000
5.875% Notes due June 15, 2020 [Member]
   
Components of long-term debt    
Senior notes $ 300,000 $ 300,000