CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Treasury stock, shares issued (in shares)	4,568,002		4,568,002
Class A Common Stock
Common stock, par value (in usd per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000		1,000,000,000
Common stock, shares issued (in shares)	163,198,127		160,833,463
Common stock, shares outstanding (in shares)	158,630,125	157,811,436	156,265,461	154,989,126	156,679,527	156,916,336
Treasury stock, shares issued (in shares)	4,568,002		4,568,002
Class B Common Stock
Common stock, par value (in usd per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	500,000,000		500,000,000
Common stock, shares issued (in shares)	21,285,533		21,285,533
Common stock, shares outstanding (in shares)	21,285,533		21,285,533	21,300,000