Landfill Accounting (Reconciliation of Final Capping, Closure and Post-Closure Liability Balance) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Landfill Accounting [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 302,537
Liability adjustments	30,238
Accretion expense associated with landfill obligations	7,992	$ 7,285
Closure payments	(5,239)
Assumption of closure liabilities from acquisitions	630
Disposition of closure liabilities from divested operations	(916)
Foreign currency translation adjustment	(509)
Final capping, closure and post-closure liability at the end of the period	$ 334,733