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Earnings per CPO/Share (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
$ / shares
$ / EquityInstruments
shares
Dec. 31, 2016
$ / shares
$ / EquityInstruments
shares
Dec. 31, 2015
$ / shares
$ / EquityInstruments
Basic weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Total Shares 344,032,527 341,017,197  
Basic earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Basic earnings per CPO attributable to stockholders of the Company | $ / EquityInstruments 1.54 1.28 3.77
Diluted weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Total Shares 362,373,163 362,429,887  
CPOs (in CPO units) 2,573,409 2,573,894  
Diluted earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Diluted earnings per CPO attributable to stockholders of the Company | $ / EquityInstruments 1.46 1.20 3.52
Series "A" Shares      
Basic weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 55,410,684 55,058,962  
Basic earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Basic earnings per share | $ / shares $ 0.01 $ 0.01 $ 0.03
Diluted weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 58,926,613 58,926,613  
Diluted earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Diluted earnings loss per Share | $ / shares $ 0.01 $ 0.01 0.03
Series "B" Shares      
Basic weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 187 187  
Basic earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Basic earnings per share | $ / shares $ 0.01 $ 0.01 0.03
Diluted weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 2,357,208 2,357,208  
Diluted earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Diluted earnings loss per Share | $ / shares $ 0.01 $ 0.01 0.03
Series "D" Shares      
Basic weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 239 239  
Basic earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Basic earnings per share | $ / shares $ 0.01 $ 0.01 0.03
Diluted weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 239 239  
Diluted earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Diluted earnings loss per Share | $ / shares $ 0.01 $ 0.01 0.03
Series "L" Shares      
Basic weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 239 239  
Basic earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Basic earnings per share | $ / shares $ 0.01 $ 0.01 0.03
Diluted weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
Shares not in the form of CPO units 239 239  
Diluted earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Diluted earnings loss per Share | $ / shares $ 0.01 $ 0.01 $ 0.03
CPOs      
Basic weighted average of outstanding total shares, CPOs and Series of Shares (not in the form of CPO unit)      
CPOs (in CPO units) 2,466,848 2,444,082  
Basic earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Basic earnings per CPO attributable to stockholders of the Company | $ / EquityInstruments 1.54 1.28 3.77
Diluted earnings per CPO and per each Series of Shares (not in the form of a CPO unit)      
Diluted earnings per CPO attributable to stockholders of the Company | $ / EquityInstruments 1.46 1.20 3.52