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Debt Schedule of Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Debt $ 421,250 $ 452,502
Current portion of debt 16,875 15,000
Long-term debt 404,375 437,502
2011 Senior Secured Credit Facility [Member] | Line of Credit [Member]
   
Debt Instrument [Line Items]    
Debt 140,000 160,000
2011 Senior Secured Credit Facility [Member] | USD Denominated Term Loan [Member]
   
Debt Instrument [Line Items]    
Debt $ 281,250 $ 292,502