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Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 20, 2012
Senior Notes [Member]
Debt Instrument [Line Items]        
Interest incurred on debt $ 21,589 $ 10,172 $ 5,745  
Amortization of discount on Senior Subordinated Notes 11,493 10,742 10,039  
Amortization of debt issuance costs 2,504 1,712 1,521  
Supply Chain Financing mark-up 451 621 1,002  
Total interest expense $ 36,037 $ 23,247 $ 18,307  
Effective interest rate, revolving credit facility 2.42% 2.21%    
Stated interest rate       6.375%
Senior subordinated notes implied rate 7.00%