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Level 4 Debt (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 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]
Mar. 31, 2014
6.375% senior notes [Member]
Dec. 31, 2013
6.375% senior notes [Member]
Dec. 31, 2013
Additional Senior Notes [Member]
Debt [Line Items]                    
Line of credit facility, amount outstanding       $ 0 $ 0          
6.375% senior notes, book value             250,000,000 299,990,000 299,990,000 49,990,000
Unamortized premium on 6.375% senior notes 1,575,000   1,623,000              
Long-term debt 301,565,000   301,613,000              
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 $ 300,000 $ 500,000