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Level 4 Debt (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Asset-based revolving credit facility [Member]
Dec. 31, 2013
Asset-based revolving credit facility [Member]
Dec. 31, 2013
Original Senior Notes [Member]
Dec. 31, 2012
Original Senior Notes [Member]
Jun. 30, 2014
6.375% senior notes [Member]
Dec. 31, 2013
6.375% senior notes [Member]
Dec. 31, 2013
Additional Senior Notes [Member]
Jun. 30, 2014
Unamortized premium on 6.375% senior notes [Member]
Dec. 31, 2013
Unamortized premium on 6.375% senior notes [Member]
Debt [Line Items]                        
Long-term Debt $ 301,516,000   $ 301,613,000 $ 0 $ 0   $ 250,000,000 $ 299,990,000 $ 299,990,000 $ 49,990,000 $ 1,526,000 $ 1,623,000
Premium rate on 6.375% senior notes                   103.50%    
Interest rate                 6.375%      
Percentage of Senior Notes tendered and accepted for exchange           100.00%       99.98%    
Interest paid $ 10,100,000 $ 9,200,000