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Leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Future Minimum Lease Payments for Capital Leases    
2013 $ 4,129  
2014 4,052  
2015 2,697  
2016 2,145  
2017 1,315  
Thereafter     
Total minimum lease payments 14,338  
Amount representing interest (1,864)  
Present value of minimum lease payments with average interest rates of 0.00% 12,474  
Current portion of capital lease obligations 3,295 3,358
Capital lease obligation, less current portion $ 9,179 $ 12,347