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Debt Level 4 Debt (Details) (USD $)
 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Asset-based revolving credit facility [Member]
Dec. 31, 2012
Asset-based revolving credit facility [Member]
Jun. 30, 2013
Asset-based revolving credit facility [Member]
Dec. 31, 2011
Asset-based revolving credit facility [Member]
Dec. 31, 2012
Senior Notes [Member]
Jun. 30, 2013
Senior Notes [Member]
Dec. 31, 2011
Senior Notes [Member]
Dec. 31, 2012
7.125% senior subordinated notes
Dec. 31, 2011
7.125% senior subordinated notes
Dec. 31, 2012
Cash [Member]
7.125% senior subordinated notes
Dec. 31, 2012
Senior Notes [Member]
7.125% senior subordinated notes
Debt Instrument [Line Items]                                
Asset-based revolving credit facility           $ 25,000,000 $ 25,000,000 $ 0 $ 0              
Long-term debt (senior notes)                   250,000,000 250,000,000 0 0 219,560,000    
Long-term debt 250,000,000   275,000,000 219,560,000                        
7.125% senior subordinated notes, face amount                         400,000,000      
Interest rate                   6.375% 6.375%   7.125%      
Repayment of senior subordinated notes 80,000,000 0 244,560,000 0 128,451,000 25,000,000             75,000,000   25,000,000 144,600,000
Proceeds from Revolving Credit Facility             50,000,000                  
Interest paid, net 9,200,000 8,400,000 18,100,000 16,700,000 18,600,000               1,000,000      
Proceeds from issuance of 6.375% senior notes $ 55,000,000 $ 0 $ 300,000,000 $ 0 $ 45,000,000         $ 250,000,000            
Senior notes interest rate, Description     If we fail to satisfy these obligations, we will pay additional interest up to 0.25% per annum to holders of the Senior Notes for the first 90-day period immediately following such date and an additional 0.25% per annum with respect to each subsequent 90-day period, up to a maximum rate of 1.0% per annum.