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Debt (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Line of Credit [Member]
Asset-based revolving credit facility [Member]
Dec. 31, 2013
Line of Credit [Member]
Asset-based revolving credit facility [Member]
Sep. 30, 2014
Senior notes [Member]
Senior Notes Due 2020 [Member]
Dec. 31, 2013
Senior notes [Member]
Senior Notes Due 2020 [Member]
Aug. 15, 2013
Senior notes [Member]
Senior Notes Due 2020 [Member]
May 08, 2013
Senior notes [Member]
Senior Notes Due 2020 [Member]
Oct. 22, 2012
Senior notes [Member]
Senior Notes Due 2020 [Member]
Sep. 30, 2014
Senior notes [Member]
Additional Senior Notes Due 2020 [Member]
Dec. 31, 2013
Senior notes [Member]
Additional Senior Notes Due 2020 [Member]
Nov. 26, 2013
Senior notes [Member]
Additional Senior Notes Due 2020 [Member]
Aug. 15, 2013
Senior notes [Member]
Additional Senior Notes Due 2020 [Member]
Debt [Line Items]                            
Long-term debt $ 301,466,000   $ 301,613,000 $ 0 $ 0 $ 299,990,000 $ 299,990,000           $ 49,990,000  
Unamortized premium on 6.375% senior notes                     1,476,000 1,623,000    
Senior Notes, Face Amount                 250,000,000 250,000,000       50,000,000
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 $ 10,400,000 $ 8,500,000