Financing Arrangements - Equipment Notes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2020 agreement
Debt Disclosure [Abstract]
Number of long-term financing agreements | agreement				6
Interest expense, debt | $	$ 852	$ 880	$ 463