CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	15,000	63,190
Common Stock Class A [Member]
Stock Repurchased During Period, Shares	54,896	4,160
Common Stock Class D [Member]
Stock Repurchased During Period, Shares	2,667,210	3,989,822
Stock Issued During Period, Shares, New Issues	978,844