Annual report pursuant to Section 13 and 15(d)

Schedule I - Debt, Note-Affiliate (Details)

v2.4.0.6
Schedule I - Debt, Note-Affiliate (Details) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 30, 2007
Parent [Member]
Loans Payable [Member]
Notes - Affiliates [Member]
May 31, 2007
Parent [Member]
Line of Credit [Member]
Notes - Affiliates [Member]
Dec. 31, 2007
Parent [Member]
Line of Credit [Member]
Notes - Affiliates [Member]
May 30, 2007
Parent [Member]
Line of Credit [Member]
Notes - Affiliates [Member]
Debt Instrument [Line Items]              
Debt instrument principal amount       $ 391,700,000     $ 400,000,000
Proceeds from Limited Partnership Investments $ 0 $ 0 $ 104,330,000   $ 391,700,000    
Stock Repurchased During Period, Shares           9.2