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Consolidated Balance Sheets Balance Sheet (Paranthetical) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]          
Authorized 1,079,145,561 1,046,947,157      
Issued 1,079,145,561 1,046,947,157      
Outstanding 1,079,145,561 1,046,947,157 1,044,800,000 1,077,500,000  
Preferred Units, Authorized 329,299,267 329,299,267      
Preferred Units, Issued 329,299,267 329,299,267      
Preferred Units, Outstanding 329,299,267 329,299,267      
Class D Units [Member]          
Class of Stock [Line Items]          
Outstanding         3,080,000