CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Class A Shares
Shares outstanding
Shares outstanding (shares)	182,006,009	166,817,333	159,485,588	159,485,588	159,160,785	157,954,130	157,019,038	156,111,139