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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Short Term Debt:    
Total Short-Term Borrowings $ 40,000  
Long Term Debt:    
Total Long-Term Borrowings 340,000 380,000
Term Loan [Member]
    
Long Term Debt:    
Total Long-Term Borrowings 340,000  
Revolving Credit Facility [Member]
    
Short Term Debt:    
Total Short-Term Borrowings     
Term Loan [Member]
    
Short Term Debt:    
Total Short-Term Borrowings $ 40,000