Shareholder's Equity - Organization structure (Details)	6 Months Ended
	Jun. 30, 2020 Vote shares
Class A Common Stock
Shareholders' Equity
Number of votes per share	1
Exchange basis for newly issued shares | shares	1
Class B Common Stock
Shareholders' Equity
Voting rights percentage	15.90%
Class C Common Stock
Shareholders' Equity
Number of votes per share	3.5
Class D Common Stock
Shareholders' Equity
Number of votes per share	1