Stockholders Equity (Narrative) (Details)	1 Months Ended	12 Months Ended
	May 31, 2019 $ / shares	Jun. 30, 2019 Holder $ / shares shares	Mar. 19, 2019 $ / shares
Temporary Stockholder Rights Plan
Stockholders Equity [Line Items]
Beneficial Ownership percentage of rights exercisable		15.00%
Rights exercise price		$ 160
Class A Common Stock
Stockholders Equity [Line Items]
Number of holders of shares | Holder		19,400
Series common stock, shares authorized | shares		2,000,000,000
Series common stock, par value		$ 0.01	$ 0.01
Class A Common Stock | Semi Annual Dividend
Stockholders Equity [Line Items]
Dividend declared per share	$ 0.23
Dividend payable date	Jun. 03, 2019
Dividend record date	May 20, 2019
Class B Common Stock
Stockholders Equity [Line Items]
Number of holders of shares | Holder		5,200
Series common stock, shares authorized | shares		1,000,000,000
Series common stock, par value		$ 0.01	$ 0.01
Class B Common Stock | Semi Annual Dividend
Stockholders Equity [Line Items]
Dividend declared per share	$ 0.23
Dividend payable date	Jun. 03, 2019
Dividend record date	May 20, 2019
Series Common Stock
Stockholders Equity [Line Items]
Series common stock, shares authorized | shares		35,000,000
Series common stock, par value		$ 0.01
Preferred stock
Stockholders Equity [Line Items]
Preferred stock, shares authorized | shares		35,000,000
Preferred stock, par value		$ 0.01