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Summary of Significant Accounting Policies (Reconciliation of Final Capping, Closure and Post-Closure Liability Balance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 301,896	$ 291,474
Liability adjustments	(1,081)	2,490
Accretion expense associated with landfill obligations	14,333	14,874
Closure payments	(21,040)	(6,488)
Assumption of closure liabilities from acquisitions	11,380	2,136
Disposition of closure liabilities from divested operations	(3,566)	(3,413)
Foreign currency translation adjustment	615	823
Final capping, closure and post-closure liability at the end of the period	$ 302,537	$ 301,896

X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Asset retirement obligation assumption of closure liabilities from acquisitions.

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Asset retirement obligation disposition of closure liabilities from divested operations

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Amount of adjustments to asset retirement obligations during the period.

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