Equity - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Apr. 30, 2020	Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock (in shares)	866,900			79,592			2,424,567	193,025
Purchase of treasury stock	$ 20,023	$ 18,126	$ 15,959	$ 1,860	$ 709	$ 1,485	$ 54,100
Accrued in other current liabilities	$ 1,000						$ 1,000
Class B Shares
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized under share repurchase program (in shares)			500,000						3,500,000	4,000,000
Purchase of treasury stock (in shares)							2,400,000
Remaining number of shares authorized to be repurchased (in shares)	2,200,000						2,200,000