Cash and Cash Equivalents	6 Months Ended
	Jun. 30, 2022
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash EquivalentsCash equivalents are short-term, highly liquid investments with insignificant interest rate risk and original maturities of three months or less at acquisition. At June 30, 2022, restricted and designated cash and investments totaled $14.8 million, of which $0.9 million was included in other current assets and $13.9 million was included in other non-current assets in the consolidated balance sheet. Restricted and designated cash and investments totaled $16.0 million at December 31, 2021, of which $0.9 million was included in other current assets and $15.1 million was included in other non-current assets in the consolidated balance sheet. The restricted funds represent deposits required by state agencies for self-insurance purposes and designated funds that are earmarked for a specific purpose and not for general business use.