Capital Structure - Share Repurchase Program (Details) - USD ($) $ in Thousands, shares in Millions		2 Months Ended	12 Months Ended			20 Months Ended
	Jul. 27, 2018	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Nov. 06, 2020	Feb. 28, 2018
Class of Stock [Line Items]
Share repurchase authorized amount	$ 100,000
Increase in authorized repurchase amount	$ 50,000
Value of shares repurchased			$ 49,864	$ 15,878	$ 66,218
Class A common stock
Class of Stock [Line Items]
Share repurchase authorized amount							$ 100,000	$ 50,000
Number of shares repurchased (in shares)						2.6
Value of shares repurchased		$ 33,900				$ 65,900
Capital Expenditures Incurred but Not yet Paid			$ 66,100
Class A common stock and Class C common stock
Class of Stock [Line Items]
Number of shares repurchased (in shares)		1.4