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Debt Senior Notes (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
2012 Senior Notes [Member]
Apr. 02, 2012
2012 Senior Notes [Member]
Jun. 30, 2012
2018 Senior Notes [Member]
May 08, 2012
2018 Senior Notes [Member]
Debt Instrument [Line Items]            
Repayment of Senior Notes       $ 41,400,000    
Debt Instrument, Interest Rate, Stated Percentage     6.875%   8.625%  
Senior Notes, Increase Additional borrowing           30,000,000
Senior notes 227,470,000 239,016,000     230,000,000 200,000,000
Restricted Payments Basket $ (11,628,000)