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Term Loan and Revolving Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of debt and short-term borrowings    
Total debt $ 125,000  
Less: Current portion of long-term debt 3,125 27,500
Long-term debt 121,875  
Term loan [Member]
   
Schedule of debt and short-term borrowings    
Total debt 125,000  
Revolving credit facility [Member]
   
Schedule of debt and short-term borrowings    
Total debt