Equity Based Compensation and Cash Awards - Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity based compensation
Equity based compensation expense	$ 19,654	$ 13,529	$ 12,778
AM LTIP RSUs
Equity based compensation
Equity based compensation expense	16,039	11,461	9,964
ROIC PSUs
Equity based compensation
Equity based compensation expense	2,770	1,158	1,912
Equity awards issued to directors
Equity based compensation
Equity based compensation expense	$ 845	$ 910	$ 902