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Series A Preferred Units Narrative (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Series A Preferred Stock [Member]
Sep. 30, 2013
Series A Preferred Stock [Member]
Gain Recognized from Conversion of Series A Preferred Units   $ 26,000,000      
Conversion of Stock, Amount Converted   (41,000,000)      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       4,651,884 2,047,571
Temporary Equity, Shares Issued 1,912,569 1,912,569 4,371,586    
Quarterly Cash Distribution for Series A Preferred Units $ 0.445