Equity Based Compensation and Cash Awards - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Equity based compensation
Equity based compensation expense	$ 5,553	$ 3,255	$ 14,026	$ 10,326
AM LTIP RSUs
Equity based compensation
Equity based compensation expense	4,525	2,905	11,438	8,608
ROIC PSUs
Equity based compensation
Equity based compensation expense	833	123	1,938	1,036
Equity awards issued to directors
Equity based compensation
Equity based compensation expense	$ 195	$ 227	$ 650	$ 682