Condensed Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Shares issued on compensation plans	41,612	116,392	425,548	731,414
Repurchase of Class A Common shares	0	1,405,535	180,541	1,690,736
Common Stock, Dividends, Per Share, Declared	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Common Stock, Dividends, Per Share, Cash Paid	$ 0.05	$ 0.05	$ 0.15	$ 0.15