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Equity - Share Ownership Plan (Details) - Class "C"
1 Months Ended
Dec. 15, 2011
tranche
shares
Dec. 31, 2011
tranche
shares
Dec. 31, 2017
shares
Apr. 27, 2006
shares
Mar. 31, 2000
shares
Share Ownership Plan          
Capital Stock to be included in PPP (as a percent)     10.00%    
Capital Stock to be included in PPP (in shares)     98,438,098    
Conversion of shares, number of shares authorized 4,593,274     41,339,464 52,505,360
Conversion of shares, number of shares converted 4,358,526 41,339,464      
Number of tranches | tranche 10 11      
Number of shares held for conversion     234,748