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Lease Obligations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Leases, Rent Expense $ 6,891 $ 4,968 $ 2,738
Capital leases payment due in 2016 691    
Rock Hill Facility [Member]
     
Lease expiration date Aug. 31, 2021    
Allowable lease renew time 2    
Additional lease renewal term 5 years    
Capital leases payments due in 2013 through 2015 669    
Capital leases payment due in 2016 683    
Capital leases payments due in 2017 through 2020 709    
Capital leases payment due in 2021 723    
Payment to acquire undeveloped land $ 370    
Capital lease implicit interest rate 6.93% 6.93%  
Other Capital Lease Obligations [Member]
     
Lease expiration date Aug. 01, 2018    
Minimum [Member] | Other Capital Lease Obligations [Member]
     
Capital lease implicit interest rate 1.75% 1.55%  
Maximum [Member] | Other Capital Lease Obligations [Member]
     
Capital lease implicit interest rate 7.80% 7.80%