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Summary of Significant Accounting Policies (Restricted Cash and Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Restricted cash	$ 72,174	$ 97,095
Restricted investments	59,014	57,516
Restricted Settlement of Insurance Claims [Member]
Restricted cash	52,906	78,335
Restricted Landfill Closure and Post-Closure Obligations [Member]
Restricted cash	12,609	12,533
Restricted investments	56,289	54,833
Restricted Other Financial Assurance Requirements [Member]
Restricted cash	6,659	6,227
Restricted investments	$ 2,725	$ 2,683

X

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

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