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Level 4 Debt (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Debt [Line Items]      
Long-term debt $ 250,000,000   $ 275,000,000
Interest paid 9,200,000 8,400,000  
Asset-based revolving credit facility [Member]
     
Debt [Line Items]      
Asset-based revolvoing credit facility 0   25,000,000
6.375% senior notes [Member]
     
Debt [Line Items]      
6.375% senior notes, book value $ 250,000,000   $ 250,000,000
Interest rate 6.375%