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Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Interest and Debt Expense [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage         6.375%
Interest incurred on debt $ 5,345 $ 5,434 $ 10,667 $ 10,883  
Amortization of discount on Senior Subordinated Notes 3,048 2,848 6,045 5,649  
Amortization of debt issuance costs 762 588 1,395 1,143  
Supply Chain Financing mark-up 0 77 47 280  
Total interest expense $ 9,155 $ 8,947 $ 18,154 $ 17,955  
Effective interest rate, revolving credit facility     2.16% 2.42%  
Senior Subordinated Notes implied rate     7.00%