Annual report pursuant to Section 13 and 15(d)

Debt and Debt-Related Parties 2007 Term Loan (Details)

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Debt and Debt-Related Parties 2007 Term Loan (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
May 31, 2010
2007 Term Loan
May 31, 2010
Loans Payable [Member]
2007 Term Loan
Dec. 31, 2011
Loans Payable [Member]
2007 Term Loan
Jun. 30, 2011
Loans Payable [Member]
2007 Term Loan
May 30, 2007
Loans Payable [Member]
2007 Term Loan
Debt Instrument [Line Items]                
Debt Instrument, Face Amount               $ 400,000,000
Fixed interest rate on loan               9.75%
Pledge Subordinated Units for Loans Payable 135,383,831              
Partnership Interest Sold, Percentage       30.00%        
Proceeds from Limited Partnership Investments 0 104,330,000 0 104,300,000        
Repayments of Long-term Debt 0 104,681,000 30,030,000   102,000,000      
Long-term Debt, Excluding Current Maturities 2,465,113,000 2,918,579,000       298,000,000    
Long-term Debt, Current Maturities             $ 298,000,000  
duration of current portion of 2007 Term Notes             12 months