Capital Structure - Share Repurchase Program (Details) - USD ($) shares in Millions		11 Months Ended	12 Months Ended
	Jul. 27, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018
Class of Stock [Line Items]
Authorized repurchase amount	$ 100,000,000
Increase in authorized repurchase amount	$ 50,000,000
Value of shares repurchased			$ 66,218,000	$ 2,683,000	$ 4,539,000
Class A
Class of Stock [Line Items]
Authorized repurchase amount						$ 50,000,000.0
Number of shares repurchased		2.6
Value of shares repurchased		$ 65,900,000
Remaining capacity for future purchases		$ 34,100,000	$ 34,100,000