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Debt Schedule of Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Debt $ 438,752 $ 452,502
Current portion of long term debt (15,000) (15,000)
Long-term debt 423,752 437,502
2011 Senior Secured Credit Facility [Member] | Line of Credit [Member]
   
Debt Instrument [Line Items]    
Debt 150,000 160,000
2011 Senior Secured Credit Facility [Member] | USD Denominated Term Loan [Member]
   
Debt Instrument [Line Items]    
Debt $ 288,752 $ 292,502